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rsyncd.conf(5)                                                                     rsyncd.conf(5)

NAME
       rsyncd.conf - configuration file for rsync in daemon mode

SYNOPSIS
       rsyncd.conf

DESCRIPTION
       The rsyncd.conf file is the runtime configuration file for rsync when run as an rsync dae‐
       mon.

       The rsyncd.conf file controls authentication, access, logging and available modules.

FILE FORMAT
       The file consists of modules and parameters. A module begins with the name of  the  module
       in  square brackets and continues until the next module begins. Modules contain parameters
       of the form "name = value".

       The file is line-based -- that is, each newline-terminated line represents either  a  com‐
       ment, a module name or a parameter.

       Only  the  first equals sign in a parameter is significant. Whitespace before or after the
       first equals sign is discarded. Leading, trailing and internal whitespace  in  module  and
       parameter  names  is  irrelevant.  Leading and trailing whitespace in a parameter value is
       discarded. Internal whitespace within a parameter value is retained verbatim.

       Any line beginning with a hash (#) is ignored, as are lines  containing  only  whitespace.
       (If a hash occurs after anything other than leading whitespace, it is considered a part of
       the line’s content.)

       Any line ending in a \ is "continued" on the next line in the customary UNIX fashion.

       The values following the equals sign in parameters are all  either  a  string  (no  quotes
       needed) or a boolean, which may be given as yes/no, 0/1 or true/false. Case is not signif‐
       icant in boolean values, but is preserved in string values.

LAUNCHING THE RSYNC DAEMON
       The rsync daemon is launched by specifying the --daemon option to rsync.

       The daemon must run with root privileges if you wish to use chroot, to bind to a port num‐
       bered  under  1024  (as is the default 873), or to set file ownership.  Otherwise, it must
       just have permission to read and write the appropriate data, log, and lock files.

       You can launch it either via inetd, as a stand-alone daemon, or from an rsync client via a
       remote  shell.   If run as a stand-alone daemon then just run the command "rsync --daemon"
       from a suitable startup script.

       When run via inetd you should add a line like this to /etc/services:

         rsync           873/tcp

       and a single line something like this to /etc/inetd.conf:

         rsync   stream  tcp     nowait  root   /usr/bin/rsync rsyncd --daemon

       Replace "/usr/bin/rsync" with the path to where you have rsync installed on  your  system.
       You will then need to send inetd a HUP signal to tell it to reread its config file.

       Note  that  you  should  not  send the rsync daemon a HUP signal to force it to reread the
       rsyncd.conf file. The file is re-read on each client connection.

GLOBAL PARAMETERS
       The first parameters in the file (before a [module] header) are the global parameters.

       You may also include any module parameters in the global part of the config file in  which
       case the supplied value will override the default for that parameter.

       You  may  use  references  to  environment  variables in the values of parameters.  String
       parameters will have %VAR% references expanded as late as possible  (when  the  string  is
       used  in  the  program),  allowing  for the use of variables that rsync sets at connection
       time, such as RSYNC_USER_NAME.  Non-string parameters (such as  true/false  settings)  are
       expanded when read from the config file.  If a variable does not exist in the environment,
       or if a sequence of characters is not a valid reference  (such  as  an  un-paired  percent
       sign), the raw characters are passed through unchanged.  This helps with backward compati‐
       bility and safety (e.g. expanding a non-existent %VAR% to an empty string in a path  could
       result  in  a  very unsafe path).  The safest way to insert a literal % into a value is to
       use %%.

       motd file
              This parameter allows you to specify a "message of the day" to display  to  clients
              on  each connect. This usually contains site information and any legal notices. The
              default is no motd file.  This can be overridden by the --dparam=motdfile=FILE com‐
              mand-line option when starting the daemon.

       pid file
              This parameter tells the rsync daemon to write its process ID to that file.  If the
              file already exists, the rsync daemon will abort rather than  overwrite  the  file.
              This can be overridden by the --dparam=pidfile=FILE command-line option when start‐
              ing the daemon.

       port   You can override the default port the daemon will  listen  on  by  specifying  this
              value  (defaults to 873).  This is ignored if the daemon is being run by inetd, and
              is superseded by the --port command-line option.

       address
              You can override the default IP address the daemon will  listen  on  by  specifying
              this value.  This is ignored if the daemon is being run by inetd, and is superseded
              by the --address command-line option.

       socket options
              This parameter can provide endless fun for people who like to tune their systems to
              the utmost degree. You can set all sorts of socket options which may make transfers
              faster (or slower!). Read the man page for the setsockopt() system call for details
              on some of the options you may be able to set. By default no special socket options
              are set.  These settings can also be  specified  via  the  --sockopts  command-line
              option.

       listen backlog
              You can override the default backlog value when the daemon listens for connections.
              It defaults to 5.

MODULE PARAMETERS
       After the global parameters you should define a number of modules, each module  exports  a
       directory  tree  as  a  symbolic name. Modules are exported by specifying a module name in
       square brackets [module] followed by the parameters for that module.  The module name can‐
       not  contain  a  slash or a closing square bracket.  If the name contains whitespace, each
       internal sequence of whitespace will be changed into a  single  space,  while  leading  or
       trailing whitespace will be discarded.

       As  with  GLOBAL PARAMETERS, you may use references to environment variables in the values
       of parameters.  See the GLOBAL PARAMETERS section for more details.

       comment
              This parameter specifies a description string that is displayed next to the  module
              name when clients obtain a list of available modules. The default is no comment.

       path   This parameter specifies the directory in the daemon’s filesystem to make available
              in this module.  You must specify this parameter for each module in rsyncd.conf.

              You may base the path’s value off of an environment  variable  by  surrounding  the
              variable name with percent signs.  You can even reference a variable that is set by
              rsync when the user connects.  For example, this would use the  authorizing  user’s
              name in the path:

                  path = /home/%RSYNC_USER_NAME%

              It  is  fine if the path includes internal spaces -- they will be retained verbatim
              (which means that you shouldn’t try to escape them).  If your final directory has a
              trailing space (and this is somehow not something you wish to fix), append a trail‐
              ing slash to the path to avoid losing the trailing whitespace.

       use chroot
              If "use chroot" is true, the rsync daemon will chroot to the "path" before starting
              the  file  transfer  with  the  client.  This has the advantage of extra protection
              against possible implementation security holes, but it  has  the  disadvantages  of
              requiring  super-user  privileges,  of not being able to follow symbolic links that
              are either absolute or outside of the  new  root  path,  and  of  complicating  the
              preservation of users and groups by name (see below).

              As  an  additional safety feature, you can specify a dot-dir in the module’s "path"
              to indicate the point where the chroot should occur.  This allows rsync to run in a
              chroot  with  a  non-"/"  path  for  the top of the transfer hierarchy.  Doing this
              guards against unintended library loading (since those absolute paths will  not  be
              inside  the  transfer  hierarchy unless you have used an unwise pathname), and lets
              you setup libraries for the chroot that are outside of the transfer.  For  example,
              specifying "/var/rsync/./module1" will chroot to the "/var/rsync" directory and set
              the inside-chroot path to "/module1".  If you had omitted the dot-dir,  the  chroot
              would have used the whole path, and the inside-chroot path would have been "/".

              When  "use  chroot"  is false or the inside-chroot path is not "/", rsync will: (1)
              munge symlinks by default for security reasons (see "munge symlinks" for a  way  to
              turn this off, but only if you trust your users), (2) substitute leading slashes in
              absolute paths with the module’s path (so that options such as --backup-dir, --com‐
              pare-dest,  etc.  interpret an absolute path as rooted in the module’s "path" dir),
              and (3) trim ".." path elements from args if rsync believes they would  escape  the
              module  hierarchy.   The  default for "use chroot" is true, and is the safer choice
              (especially if the module is not read-only).

              When this parameter is enabled, rsync will not attempt to map users and  groups  by
              name (by default), but instead copy IDs as though --numeric-ids had been specified.
              In order to enable name-mapping, rsync needs to be able to use the standard library
              functions for looking up names and IDs (i.e.  getpwuid() , getgrgid() , getpwname()
              , and getgrnam() ).  This means the rsync process in the chroot hierarchy will need
              to  have  access  to  the  resources used by these library functions (traditionally
              /etc/passwd and /etc/group, but perhaps additional dynamic libraries as well).

              If you copy the necessary resources into the module’s chroot area, you should  pro‐
              tect them through your OS’s normal user/group or ACL settings (to prevent the rsync
              module’s user from being able to change them), and then hide them from  the  user’s
              view via "exclude" (see how in the discussion of that parameter).  At that point it
              will be safe to enable the mapping of users and groups by name using  the  "numeric
              ids" daemon parameter (see below).

              Note  also  that  you are free to setup custom user/group information in the chroot
              area that is different from your normal system.  For example, you could  abbreviate
              the list of users and groups.

       numeric ids
              Enabling  this  parameter  disables the mapping of users and groups by name for the
              current  daemon  module.   This  prevents  the  daemon  from  trying  to  load  any
              user/group-related  files or libraries.  This enabling makes the transfer behave as
              if the client had passed the --numeric-ids command-line option.  By  default,  this
              parameter is enabled for chroot modules and disabled for non-chroot modules.

              A  chroot-enabled module should not have this parameter enabled unless you’ve taken
              steps to ensure that the module has the necessary resources it needs  to  translate
              names, and that it is not possible for a user to change those resources.

       munge symlinks
              This  parameter tells rsync to modify all symlinks in the same way as the (non-dae‐
              mon-affecting) --munge-links command-line option (using a method described  below).
              This  should  help protect your files from user trickery when your daemon module is
              writable.  The default is disabled when "use chroot" is on  and  the  inside-chroot
              path is "/", otherwise it is enabled.

              If  you  disable this parameter on a daemon that is not read-only, there are tricks
              that a user can play with uploaded symlinks to  access  daemon-excluded  items  (if
              your  module  has any), and, if "use chroot" is off, rsync can even be tricked into
              showing or changing data that is outside the module’s path  (as  access-permissions
              allow).

              The  way  rsync  disables the use of symlinks is to prefix each one with the string
              "/rsyncd-munged/".  This prevents the links from being used as long as that  direc‐
              tory  does  not exist.  When this parameter is enabled, rsync will refuse to run if
              that path is a directory or a symlink to a directory.  When using the  "munge  sym‐
              links" parameter in a chroot area that has an inside-chroot path of "/", you should
              add "/rsyncd-munged/" to the exclude setting for the module so that  a  user  can’t
              try to create it.

              Note:   rsync makes no attempt to verify that any pre-existing symlinks in the mod‐
              ule’s hierarchy are as safe as you want them to be  (unless,  of  course,  it  just
              copied  in  the  whole  hierarchy).   If you setup an rsync daemon on a new area or
              locally add symlinks, you can manually protect your symlinks from being  abused  by
              prefixing "/rsyncd-munged/" to the start of every symlink’s value.  There is a perl
              script in the support directory of the source code named "munge-symlinks" that  can
              be used to add or remove this prefix from your symlinks.

              When  this  parameter  is disabled on a writable module and "use chroot" is off (or
              the inside-chroot path is not "/"), incoming symlinks will be modified  to  drop  a
              leading  slash  and  to  remove ".." path elements that rsync believes will allow a
              symlink to escape the module’s hierarchy.  There are tricky  ways  to  work  around
              this,  though, so you had better trust your users if you choose this combination of
              parameters.

       charset
              This specifies the name of the character set in which the  module’s  filenames  are
              stored.  If the client uses an --iconv option, the daemon will use the value of the
              "charset" parameter regardless of the character set  the  client  actually  passed.
              This  allows  the  daemon  to support charset conversion in a chroot module without
              extra files in the chroot area, and also ensures that name-translation is done in a
              consistent  manner.   If  the "charset" parameter is not set, the --iconv option is
              refused, just as if "iconv" had been specified via "refuse options".

              If you wish to force users to always use  --iconv  for  a  particular  module,  add
              "no-iconv" to the "refuse options" parameter.  Keep in mind that this will restrict
              access to your module to very new rsync clients.

       max connections
              This parameter allows you to specify the maximum number of simultaneous connections
              you  will  allow.   Any  clients  connecting when the maximum has been reached will
              receive a message telling them to try later.  The default  is  0,  which  means  no
              limit.  A negative value disables the module.  See also the "lock file" parameter.

       log file
              When  the  "log file" parameter is set to a non-empty string, the rsync daemon will
              log messages to the indicated file rather than using syslog. This  is  particularly
              useful  on systems (such as AIX) where syslog() doesn’t work for chrooted programs.
              The file is opened before chroot() is called, allowing it to be placed outside  the
              transfer.   If  this  value  is  set on a per-module basis instead of globally, the
              global log will still contain any authorization failures or config-file error  mes‐
              sages.

              If  the  daemon fails to open the specified file, it will fall back to using syslog
              and output an error about the failure.  (Note that the failure to open  the  speci‐
              fied log file used to be a fatal error.)

              This  setting  can  be  overridden  by  using  the --log-file=FILE or --dparam=log‐
              file=FILE command-line options.  The former overrides all the  log-file  parameters
              of  the  daemon and all module settings.  The latter sets the daemon’s log file and
              the default for all the modules, which still allows modules to override the default
              setting.

       syslog facility
              This  parameter  allows you to specify the syslog facility name to use when logging
              messages from the rsync daemon. You may use any standard syslog facility name which
              is  defined  on  your  system.  Common names are auth, authpriv, cron, daemon, ftp,
              kern, lpr, mail, news,  security,  syslog,  user,  uucp,  local0,  local1,  local2,
              local3, local4, local5, local6 and local7. The default is daemon.  This setting has
              no effect if the "log file" setting is  a  non-empty  string  (either  set  in  the
              per-modules settings, or inherited from the global settings).

       max verbosity
              This parameter allows you to control the maximum amount of verbose information that
              you’ll allow the daemon to generate (since the information goes into the log file).
              The default is 1, which allows the client to request one level of verbosity.

              This also affects the user’s ability to request higher levels of --info and --debug
              logging.  If the max value is 2, then no info and/or debug  value  that  is  higher
              than what would be set by -vv will be honored by the daemon in its logging.  To see
              how high of a verbosity level you need to accept for a particular info/debug level,
              refer  to  "rsync  --info=help"  and  "rsync --debug=help".  For instance, it takes
              max-verbosity 4 to be able to output debug TIME2 and FLIST3.

       lock file
              This parameter specifies the file to use to support the "max  connections"  parame‐
              ter.  The rsync daemon uses record locking on this file to ensure that the max con‐
              nections limit is not exceeded for the modules sharing the lock file.  The  default
              is /var/run/rsyncd.lock.

       read only
              This  parameter  determines whether clients will be able to upload files or not. If
              "read only" is true then any attempted uploads will fail. If "read only"  is  false
              then  uploads  will  be possible if file permissions on the daemon side allow them.
              The default is for all modules to be read only.

              Note that "auth users" can override this setting on a per-user basis.

       write only
              This parameter determines whether clients will be able to download files or not. If
              "write  only"  is  true  then any attempted downloads will fail. If "write only" is
              false then downloads will be possible if file permissions on the daemon side  allow
              them.  The default is for this parameter to be disabled.

       list   This  parameter determines whether this module is listed when the client asks for a
              listing of available modules.  In addition, if this is false, the daemon will  pre‐
              tend  the  module  does  not  exist when a client denied by "hosts allow" or "hosts
              deny" attempts to access it.  Realize that if "reverse lookup" is disabled globally
              but  enabled  for  the  module,  the  resulting  reverse  lookup  to  a potentially
              client-controlled DNS server may still reveal to the client that it hit an existing
              module.  The default is for modules to be listable.

       uid    This  parameter  specifies the user name or user ID that file transfers to and from
              that module should take place as when the daemon was run as  root.  In  combination
              with  the  "gid" parameter this determines what file permissions are available. The
              default when run by a super-user is to switch to the system’s "nobody"  user.   The
              default  for a non-super-user is to not try to change the user.  See also the "gid"
              parameter.

              The RSYNC_USER_NAME environment variable may be used to request that rsync  run  as
              the  authorizing  user.   For  example, if you want a rsync to run as the same user
              that was received for the rsync authentication, this setup is useful:

                  uid = %RSYNC_USER_NAME%
                  gid = *

       gid    This parameter specifies one or more group names/IDs that will be used when access‐
              ing the module.  The first one will be the default group, and any extra ones be set
              as supplemental groups.  You may also specify a "*" as the first gid in  the  list,
              which  will  be  replaced  by  all  the  normal groups for the transfer’s user (see
              "uid").  The default when run by a super-user is to switch to  your  OS’s  "nobody"
              (or perhaps "nogroup") group with no other supplementary groups.  The default for a
              non-super-user is to not change any group attributes (and indeed, your OS  may  not
              allow a non-super-user to try to change their group settings).

       fake super
              Setting  "fake super = yes" for a module causes the daemon side to behave as if the
              --fake-super  command-line  option  had  been  specified.   This  allows  the  full
              attributes  of  a file to be stored without having to have the daemon actually run‐
              ning as root.

       filter The daemon has its own filter chain that determines what  files  it  will  let  the
              client access.  This chain is not sent to the client and is independent of any fil‐
              ters the client may have specified.  Files excluded  by  the  daemon  filter  chain
              (daemon-excluded  files)  are  treated  as non-existent if the client tries to pull
              them, are skipped with an error message if the client tries to push them  (trigger‐
              ing  exit code 23), and are never deleted from the module.  You can use daemon fil‐
              ters to prevent clients from downloading or tampering with  private  administrative
              files, such as files you may add to support uid/gid name translations.

              The  daemon  filter  chain  is  built from the "filter", "include from", "include",
              "exclude from", and "exclude" parameters, in that order of priority.  Anchored pat‐
              terns  are anchored at the root of the module.  To prevent access to an entire sub‐
              tree, for example, "/secret", you must exclude everything in the subtree; the easi‐
              est way to do this is with a triple-star pattern like "/secret/***".

              The  "filter" parameter takes a space-separated list of daemon filter rules, though
              it is smart enough to know not to split a token at an  internal  space  in  a  rule
              (e.g.  "-  /foo   -  /bar"  is  parsed  as two rules).  You may specify one or more
              merge-file rules using the normal syntax.  Only one "filter" parameter can apply to
              a given module in the config file, so put all the rules you want in a single param‐
              eter.  Note that per-directory merge-file rules do not provide as  much  protection
              as  global rules, but they can be used to make --delete work better during a client
              download operation if the per-dir merge files are included in the transfer and  the
              client requests that they be used.

       exclude
              This  parameter  takes  a space-separated list of daemon exclude patterns.  As with
              the client --exclude option, patterns can be qualified with "- " or "+ " to explic‐
              itly  indicate  exclude/include.  Only one "exclude" parameter can apply to a given
              module.  See the "filter" parameter for a description of how excluded files  affect
              the daemon.

       include
              Use  an  "include"  to  override  the effects of the "exclude" parameter.  Only one
              "include" parameter can apply to a given module.  See the "filter" parameter for  a
              description of how excluded files affect the daemon.

       exclude from
              This  parameter  specifies  the  name  of a file on the daemon that contains daemon
              exclude patterns, one per line.  Only one "exclude from" parameter can apply  to  a
              given  module;  if  you have multiple exclude-from files, you can specify them as a
              merge file in the "filter" parameter.  See the "filter" parameter for a description
              of how excluded files affect the daemon.

       include from
              Analogue  of  "exclude  from"  for  a  file  of  daemon include patterns.  Only one
              "include from" parameter can apply to a given module.  See the  "filter"  parameter
              for a description of how excluded files affect the daemon.

       incoming chmod
              This  parameter  allows  you to specify a set of comma-separated chmod strings that
              will affect the permissions of all incoming files (files that are being received by
              the  daemon).   These  changes  happen after all other permission calculations, and
              this will even override destination-default and/or existing  permissions  when  the
              client  does  not specify --perms.  See the description of the --chmod rsync option
              and the chmod(1) manpage for information on the format of this string.

       outgoing chmod
              This parameter allows you to specify a set of comma-separated  chmod  strings  that
              will  affect  the  permissions of all outgoing files (files that are being sent out
              from the daemon).  These changes happen first, making the sent  permissions  appear
              to  be  different  than  those  stored in the filesystem itself.  For instance, you
              could disable group write permissions on the server while having it appear to be on
              to  the  clients.  See the description of the --chmod rsync option and the chmod(1)
              manpage for information on the format of this string.

       auth users
              This parameter specifies a  comma  and/or  space-separated  list  of  authorization
              rules.   In  its simplest form, you list the usernames that will be allowed to con‐
              nect to this module. The usernames do not need to exist on the  local  system.  The
              rules  may contain shell wildcard characters that will be matched against the user‐
              name provided by the client for authentication. If "auth users"  is  set  then  the
              client  will be challenged to supply a username and password to connect to the mod‐
              ule. A challenge response authentication protocol is used for  this  exchange.  The
              plain text usernames and passwords are stored in the file specified by the "secrets
              file" parameter. The default is for all users to be able to connect without a pass‐
              word (this is called "anonymous rsync").

              In addition to username matching, you can specify groupname matching via a ’@’ pre‐
              fix.  When using groupname matching, the authenticating username  must  be  a  real
              user  on  the system, or it will be assumed to be a member of no groups.  For exam‐
              ple, specifying "@rsync" will match the authenticating user if the named user is  a
              member of the rsync group.

              Finally,  options  may  be  specified  after a colon (:).  The options allow you to
              "deny" a user or a group, set the access to "ro" (read-only), or set the access  to
              "rw"  (read/write).  Setting an auth-rule-specific ro/rw setting overrides the mod‐
              ule’s "read only" setting.

              Be sure to put the rules in the order you want them  to  be  matched,  because  the
              checking  stops at the first matching user or group, and that is the only auth that
              is checked.  For example:

                auth users = joe:deny @guest:deny admin:rw @rsync:ro susan joe sam

              In the above rule, user joe will be denied access no matter what.  Any user that is
              in  the  group  "guest"  is  also  denied  access.  The user "admin" gets access in
              read/write mode, but only if the admin user is not in group  "guest"  (because  the
              admin  user-matching  rule would never be reached if the user is in group "guest").
              Any other user who is in group "rsync" will get read-only access.   Finally,  users
              susan,  joe,  and  sam  get  the  ro/rw setting of the module, but only if the user
              didn’t match an earlier group-matching rule.

              See the description of the secrets file for how you can have per-user passwords  as
              well  as  per-group  passwords.  It also explains how a user can authenticate using
              their user password or (when applicable) a group password, depending on  what  rule
              is being authenticated.

              See  also the section entitled "USING RSYNC-DAEMON FEATURES VIA A REMOTE SHELL CON‐
              NECTION" in rsync(1) for information on how handle  an  rsyncd.conf-level  username
              that differs from the remote-shell-level username when using a remote shell to con‐
              nect to an rsync daemon.

       secrets file
              This parameter specifies the name of a file  that  contains  the  username:password
              and/or  @groupname:password pairs used for authenticating this module. This file is
              only consulted if the "auth users" parameter is specified.  The file is  line-based
              and  contains one name:password pair per line.  Any line has a hash (#) as the very
              first character on the line is considered a comment and is skipped.  The  passwords
              can  contain  any  characters  but  be warned that many operating systems limit the
              length of passwords that can be typed at the client end, so you may find that pass‐
              words longer than 8 characters don’t work.

              The  use  of group-specific lines are only relevant when the module is being autho‐
              rized using a matching "@groupname" rule.  When  that  happens,  the  user  can  be
              authorized  via  either their "username:password" line or the "@groupname:password"
              line for the group that triggered the authentication.

              It is up to you what kind of password entries you want to  include,  either  users,
              groups,  or both.  The use of group rules in "auth users" does not require that you
              specify a group password if you do not want to use shared passwords.

              There is no default for the "secrets file" parameter, you must choose a name  (such
              as  /etc/rsyncd.secrets).   The  file must normally not be readable by "other"; see
              "strict modes".  If the file is not found or is rejected, no  logins  for  a  "user
              auth" module will be possible.

       strict modes
              This  parameter  determines whether or not the permissions on the secrets file will
              be checked.  If "strict modes" is true, then the secrets file must not be  readable
              by  any  user  ID  other  than  the one that the rsync daemon is running under.  If
              "strict modes" is false, the check is not performed.  The default  is  true.   This
              parameter was added to accommodate rsync running on the Windows operating system.

       hosts allow
              This  parameter allows you to specify a list of patterns that are matched against a
              connecting clients hostname and IP address. If none of the patterns match then  the
              connection is rejected.

              Each pattern can be in one of five forms:

              o      a dotted decimal IPv4 address of the form a.b.c.d, or an IPv6 address of the
                     form a:b:c::d:e:f. In this case the incoming machine’s IP address must match
                     exactly.

              o      an address/mask in the form ipaddr/n where ipaddr is the IP address and n is
                     the number of one bits in the netmask.  All IP  addresses  which  match  the
                     masked IP address will be allowed in.

              o      an  address/mask  in the form ipaddr/maskaddr where ipaddr is the IP address
                     and maskaddr is the netmask in dotted decimal notation for IPv4, or  similar
                     for  IPv6, e.g. ffff:ffff:ffff:ffff:: instead of /64. All IP addresses which
                     match the masked IP address will be allowed in.

              o      a hostname pattern using wildcards. If the hostname of the connecting IP (as
                     determined  by a reverse lookup) matches the wildcarded name (using the same
                     rules as normal unix filename matching), the client  is  allowed  in.   This
                     only works if "reverse lookup" is enabled (the default).

              o      a  hostname. A plain hostname is matched against the reverse DNS of the con‐
                     necting IP (if "reverse lookup" is enabled), and/or  the  IP  of  the  given
                     hostname  is  matched  against  the  connecting  IP  (if "forward lookup" is
                     enabled, as it is by default).  Any match will be allowed in.

              Note IPv6 link-local addresses can have a scope in the address specification:

                  fe80::1%link1
                  fe80::%link1/64
                  fe80::%link1/ffff:ffff:ffff:ffff::

              You can also combine "hosts allow" with a separate "hosts deny" parameter. If  both
              parameters  are  specified  then the "hosts allow" parameter is checked first and a
              match results in the client being able to connect. The "hosts  deny"  parameter  is
              then  checked  and  a  match  means that the host is rejected. If the host does not
              match either the "hosts allow" or the "hosts deny" patterns then it is  allowed  to
              connect.

              The default is no "hosts allow" parameter, which means all hosts can connect.

       hosts deny
              This  parameter allows you to specify a list of patterns that are matched against a
              connecting clients hostname and IP address. If the pattern matches then the connec‐
              tion is rejected. See the "hosts allow" parameter for more information.

              The default is no "hosts deny" parameter, which means all hosts can connect.

       reverse lookup
              Controls whether the daemon performs a reverse lookup on the client’s IP address to
              determine its hostname, which is used for "hosts allow"/"hosts deny" checks and the
              "%h"  log  escape.   This  is enabled by default, but you may wish to disable it to
              save time if you know the lookup will not return a useful result, in which case the
              daemon will use the name "UNDETERMINED" instead.

              If  this parameter is enabled globally (even by default), rsync performs the lookup
              as soon as a client connects, so disabling it for  a  module  will  not  avoid  the
              lookup.  Thus, you probably want to disable it globally and then enable it for mod‐
              ules that need the information.

       forward lookup
              Controls whether the daemon performs a forward lookup on any hostname specified  in
              an  hosts  allow/deny  setting.  By default this is enabled, allowing the use of an
              explicit hostname that would not be returned by reverse DNS of the connecting IP.

       ignore errors
              This parameter tells rsyncd to ignore  I/O  errors  on  the  daemon  when  deciding
              whether  to run the delete phase of the transfer. Normally rsync skips the --delete
              step if any I/O errors have occurred in order to prevent disastrous deletion due to
              a  temporary  resource  shortage  or  other  I/O  error. In some cases this test is
              counter productive so you can use this parameter to turn off this behavior.

       ignore nonreadable
              This tells the rsync daemon to completely ignore files that are not readable by the
              user.  This  is  useful  for  public archives that may have some non-readable files
              among the directories, and the sysadmin doesn’t want those files to be seen at all.

       transfer logging
              This parameter enables per-file logging of downloads and uploads in a format  some‐
              what  similar  to that used by ftp daemons.  The daemon always logs the transfer at
              the end, so if a transfer is aborted, no mention will be made in the log file.

              If you want to customize the log lines, see the "log format" parameter.

       log format
              This parameter allows you to specify the format used  for  logging  file  transfers
              when  transfer logging is enabled.  The format is a text string containing embedded
              single-character escape sequences  prefixed  with  a  percent  (%)  character.   An
              optional  numeric  field  width  may  also be specified between the percent and the
              escape letter (e.g. "%-50n %8l %07p").  In addition, one or more apostrophes may be
              specified  prior  to a numerical escape to indicate that the numerical value should
              be made more human-readable.  The 3 supported  levels  are  the  same  as  for  the
              --human-readable  command-line  option, though the default is for human-readability
              to be off.  Each added apostrophe increases the level (e.g. "%''l %'b %f").

              The default log format is "%o %h [%a] %m (%u) %f %l", and a "%t [%p]  "  is  always
              prefixed  when  using the "log file" parameter.  (A perl script that will summarize
              this default log format is included in the rsync source code  distribution  in  the
              "support" subdirectory: rsyncstats.)

              The single-character escapes that are understood are as follows:

              o      %a the remote IP address (only available for a daemon)

              o      %b the number of bytes actually transferred

              o      %B the permission bits of the file (e.g. rwxrwxrwt)

              o      %c  the  total size of the block checksums received for the basis file (only
                     when sending)

              o      %C the full-file MD5 checksum if --checksum is enabled or a file was  trans‐
                     ferred (only for protocol 30 or above).

              o      %f the filename (long form on sender; no trailing "/")

              o      %G the gid of the file (decimal) or "DEFAULT"

              o      %h the remote host name (only available for a daemon)

              o      %i an itemized list of what is being updated

              o      %l the length of the file in bytes

              o      %L  the  string  "  ->  SYMLINK",  "  =>  HARDLINK", or "" (where SYMLINK or
                     HARDLINK is a filename)

              o      %m the module name

              o      %M the last-modified time of the file

              o      %n the filename (short form; trailing "/" on dir)

              o      %o the operation, which is "send", "recv", or "del."  (the  latter  includes
                     the trailing period)

              o      %p the process ID of this rsync session

              o      %P the module path

              o      %t the current date time

              o      %u the authenticated username or an empty string

              o      %U the uid of the file (decimal)

              For  a  list  of  what the characters mean that are output by "%i", see the --item‐
              ize-changes option in the rsync manpage.

              Note that some of the logged output changes when talking with older rsync versions.
              For  instance,  deleted  files  were only output as verbose messages prior to rsync
              2.6.4.

       timeout
              This parameter allows you to override the clients choice for I/O timeout  for  this
              module.  Using this parameter you can ensure that rsync won’t wait on a dead client
              forever. The timeout is specified in seconds. A value of zero means no timeout  and
              is  the  default. A good choice for anonymous rsync daemons may be 600 (giving a 10
              minute timeout).

       refuse options
              This parameter allows you to specify a space-separated list of rsync  command  line
              options that will be refused by your rsync daemon.  You may specify the full option
              name, its one-letter abbreviation, or a  wild-card  string  that  matches  multiple
              options.  For example, this would refuse --checksum (-c) and all the various delete
              options:

                  refuse options = c delete

              The reason the above refuses all delete options is that the options imply --delete,
              and  implied  options  are  refused  just  like explicit options.  As an additional
              safety feature, the refusal of "delete" also refuses remove-source-files  when  the
              daemon  is  the  sender;  if you want the latter without the former, instead refuse
              "delete-*"   --   that   refuses   all   the   delete   modes   without   affecting
              --remove-source-files.

              When  an  option is refused, the daemon prints an error message and exits.  To pre‐
              vent all compression when serving files, you can  use  "dont  compress  =  *"  (see
              below)  instead  of  "refuse  options  = compress" to avoid returning an error to a
              client that requests compression.

       dont compress
              This parameter allows you to select  filenames  based  on  wildcard  patterns  that
              should not be compressed when pulling files from the daemon (no analogous parameter
              exists to govern the pushing of files to a daemon).  Compression  is  expensive  in
              terms  of  CPU usage, so it is usually good to not try to compress files that won’t
              compress well, such as already compressed files.

              The "dont compress" parameter takes  a  space-separated  list  of  case-insensitive
              wildcard  patterns.  Any  source  filename matching one of the patterns will not be
              compressed during transfer.

              See the --skip-compress parameter in the rsync(1) manpage for the list of file suf‐
              fixes  that  are  not compressed by default.  Specifying a value for the "dont com‐
              press" parameter changes the default when the daemon is the sender.

       pre-xfer exec, post-xfer exec
              You may specify a command to be run before  and/or  after  the  transfer.   If  the
              pre-xfer  exec command fails, the transfer is aborted before it begins.  Any output
              from the script on stdout (up to several KB) will be displayed  to  the  user  when
              aborting,  but is NOT displayed if the script returns success.  Any output from the
              script on stderr goes to the daemon’s stderr, which is typically discarded  (though
              see  --no-detatch  option for a way to see the stderr output, which can assist with
              debugging).

              The following environment variables will be set, though some are  specific  to  the
              pre-xfer or the post-xfer environment:

              o      RSYNC_MODULE_NAME: The name of the module being accessed.

              o      RSYNC_MODULE_PATH: The path configured for the module.

              o      RSYNC_HOST_ADDR: The accessing host’s IP address.

              o      RSYNC_HOST_NAME: The accessing host’s name.

              o      RSYNC_USER_NAME: The accessing user’s name (empty if no user).

              o      RSYNC_PID: A unique number for this transfer.

              o      RSYNC_REQUEST:  (pre-xfer  only) The module/path info specified by the user.
                     Note that the user can specify multiple source files, so the request can  be
                     something like "mod/path1 mod/path2", etc.

              o      RSYNC_ARG#:  (pre-xfer only) The pre-request arguments are set in these num‐
                     bered values. RSYNC_ARG0 is always "rsyncd", followed by  the  options  that
                     were used in RSYNC_ARG1, and so on.  There will be a value of "." indicating
                     that the options are done and the path args are beginning --  these  contain
                     similar information to RSYNC_REQUEST, but with values separated and the mod‐
                     ule name stripped off.

              o      RSYNC_EXIT_STATUS: (post-xfer only) the server side’s exit value.  This will
                     be  0  for  a  successful run, a positive value for an error that the server
                     generated, or a -1 if rsync failed to exit properly.   Note  that  an  error
                     that  occurs  on  the  client side does not currently get sent to the server
                     side, so this is not the final exit status for the whole transfer.

              o      RSYNC_RAW_STATUS: (post-xfer only) the raw exit value from waitpid() .

              Even though the commands can be associated with a particular module, they  are  run
              using the permissions of the user that started the daemon (not the module’s uid/gid
              setting) without any chroot restrictions.

CONFIG DIRECTIVES
       There are currently two config directives available that allow a config file  to  incorpo‐
       rate  the contents of other files:  &include and &merge.  Both allow a reference to either
       a file or a directory.  They differ in how segregated the file’s contents  are  considered
       to be.

       The  &include  directive  treats  each file as more distinct, with each one inheriting the
       defaults of the parent file, starting the parameter parsing as globals/defaults, and leav‐
       ing the defaults unchanged for the parsing of the rest of the parent file.

       The  &merge  directive, on the other hand, treats the file’s contents as if it were simply
       inserted in place of the directive, and thus it can set parameters in a module started  in
       another file, can affect the defaults for other files, etc.

       When an &include or &merge directive refers to a directory, it will read in all the *.conf
       or *.inc files (respectively) that are contained inside that directory (without any recur‐
       sive scanning), with the files sorted into alpha order.  So, if you have a directory named
       "rsyncd.d" with the files "foo.conf", "bar.conf", and "baz.conf" inside  it,  this  direc‐
       tive:

           &include /path/rsyncd.d

       would be the same as this set of directives:

           &include /path/rsyncd.d/bar.conf
           &include /path/rsyncd.d/baz.conf
           &include /path/rsyncd.d/foo.conf

       except that it adjusts as files are added and removed from the directory.

       The  advantage  of  the &include directive is that you can define one or more modules in a
       separate file without worrying about unintended side-effects  between  the  self-contained
       module files.

       The  advantage  of  the  &merge directive is that you can load config snippets that can be
       included into multiple module definitions, and you can also set global  values  that  will
       affect connections (such as motd file), or globals that will affect other include files.

       For example, this is a useful /etc/rsyncd.conf file:

           port = 873
           log file = /var/log/rsync.log
           pid file = /var/lock/rsync.lock

           &merge /etc/rsyncd.d
           &include /etc/rsyncd.d

       This  would  merge  any  /etc/rsyncd.d/*.inc  files (for global values that should stay in
       effect), and then include any /etc/rsyncd.d/*.conf files  (defining  modules  without  any
       global-value cross-talk).

AUTHENTICATION STRENGTH
       The  authentication  protocol used in rsync is a 128 bit MD4 based challenge response sys‐
       tem. This is fairly weak protection, though (with at least  one  brute-force  hash-finding
       algorithm  publicly  available), so if you want really top-quality security, then I recom‐
       mend that you run rsync over ssh.  (Yes, a future version of rsync will switch over  to  a
       stronger hashing method.)

       Also  note that the rsync daemon protocol does not currently provide any encryption of the
       data that is transferred over the connection. Only authentication is provided. Use ssh  as
       the transport if you want encryption.

       Future  versions  of  rsync  may support SSL for better authentication and encryption, but
       that is still being investigated.

EXAMPLES
       A simple rsyncd.conf file that allow anonymous rsync to a ftp area at /home/ftp would be:

       [ftp]
               path = /home/ftp
               comment = ftp export area

       A more sophisticated example would be:

       uid = nobody
       gid = nobody
       use chroot = yes
       max connections = 4
       syslog facility = local5
       pid file = /var/run/rsyncd.pid

       [ftp]
               path = /var/ftp/./pub
               comment = whole ftp area (approx 6.1 GB)

       [sambaftp]
               path = /var/ftp/./pub/samba
               comment = Samba ftp area (approx 300 MB)

       [rsyncftp]
               path = /var/ftp/./pub/rsync
               comment = rsync ftp area (approx 6 MB)

       [sambawww]
               path = /public_html/samba
               comment = Samba WWW pages (approx 240 MB)

       [cvs]
               path = /data/cvs
               comment = CVS repository (requires authentication)
               auth users = tridge, susan
               secrets file = /etc/rsyncd.secrets

       The /etc/rsyncd.secrets file would look something like this:

              tridge:mypass
              susan:herpass

FILES
       /etc/rsyncd.conf or rsyncd.conf

SEE ALSO
       rsync(1)

DIAGNOSTICS
BUGS
       Please report bugs! The rsync bug tracking system is online at http://rsync.samba.org/

VERSION
       This man page is current for version 3.1.1 of rsync.

CREDITS
       rsync is distributed under the GNU General Public  License.   See  the  file  COPYING  for
       details.

       The primary ftp site for rsync is ftp://rsync.samba.org/pub/rsync.

       A WEB site is available at http://rsync.samba.org/

       We would be delighted to hear from you if you like this program.

       This program uses the zlib compression library written by Jean-loup Gailly and Mark Adler.

THANKS
       Thanks  to  Warren Stanley for his original idea and patch for the rsync daemon. Thanks to
       Karsten Thygesen for his many suggestions and documentation!

AUTHOR
       rsync was written by Andrew Tridgell and Paul Mackerras.  Many people have later  contrib‐
       uted to it.

       Mailing lists for support and development are available at http://lists.samba.org

                                           22 Jun 2014                             rsyncd.conf(5)

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