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

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


       The  rsyncd.conf  file is the runtime configuration file for rsync when
       run as an rsync daemon.

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

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

       The  file is line-based -- that is, each newline-terminated line repre-
       sents either a comment, 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.

       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 significant in boolean  values,  but  is
       preserved in string values.

       The  rsync  daemon  is  launched  by  specifying the --daemon option to

       The daemon must run with root privileges if you wish to use chroot,  to
       bind  to  a port numbered 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  sig-
       nal 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 con-

       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.

       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.

       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.

       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.

              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 are superseded
              by the --sockopts command-line option.

       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]  fol-
       lowed  by  the parameters for that module.  The module name cannot con-
       tain a slash or a closing square bracket.  If the name contains  white-
       space, each internal sequence of whitespace will be changed into a sin-
       gle space, while leading or trailing whitespace will be discarded.

              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  filesys-
              tem  to  make  available  in this module.  You must specify this
              parameter for each module in rsyncd.conf.

       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 implemen-
              tation 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,  specify-
              ing  "/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 abso-
              lute paths with the module's  path  (so  that  options  such  as
              --backup-dir, --compare-dest, etc. interpret an absolute path as
              rooted in the module's "path" dir), and (3) trim ".." path  ele-
              ments  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() , get-
              grgid() , 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  protect  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 informa-
              tion in the chroot area that is different from your normal  sys-
              tem.   For  example,  you could abbreviate the list of users and

       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 nec-
              essary 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 incoming symlinks in a
              way that makes them unusable but recoverable (see below).   This
              should help protect your files from user trickery when your dae-
              mon module is writable.   The  default  is  disabled  when  "use
              chroot" is on and the inside-chroot path is "/", otherwise it is

              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-per-
              missions 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 directory 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
              symlinks" 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  hierarchy are as safe as you want them to be.
              If you setup an rsync daemon on a new area or locally  add  sym-
              links,  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.

              This  specifies  the name of the character set in which the mod-
              ule'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 particu-
              lar 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"

       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-mod-
              ule basis instead of globally, the global log will still contain
              any authorization failures or config-file error messages.

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

       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 ver-
              bose 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.

       lock file
              This parameter specifies the file to use  to  support  the  "max
              connections"  parameter. The rsync daemon uses record locking on
              this file to ensure  that  the  max  connections  limit  is  not
              exceeded  for the modules sharing the lock file.  The default is

       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.

       write only
              This parameter determines whether clients will be able to  down-
              load  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 if this module should be  listed  when
              the  client  asks for a listing of available modules. By setting
              this to false you can create hidden modules. 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
              is uid -2, which is normally the user "nobody".

       gid    This  parameter  specifies  the group name or group ID that file
              transfers to and from that module should take place as when  the
              daemon  was  run  as root. This complements the "uid" parameter.
              The default is gid -2, which is normally the group "nobody".

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

       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 filters  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 (triggering exit  code  23),  and  are  never
              deleted  from the module.  You can use daemon filters to prevent
              clients from downloading or tampering with  private  administra-
              tive  files,  such  as files you may add to support uid/gid name

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

              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 parameter.  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

              This  parameter  takes  a space-separated list of daemon exclude
              patterns.  As with the client --exclude option, patterns can  be
              qualified   with   "-   "   or   "+  "  to  explicitly  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.

              Use an "include" to override the effects of the "exclude" param-
              eter.  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" parame-
              ter for a description of how excluded files affect the daemon.

       include from
              Analogue of "exclude from" for a file  of  daemon  include  pat-
              terns.   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 permis-
              sions 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  space-separated  list  of
              usernames  that  will  be allowed to connect to this module. The
              usernames do not need to exist on the local  system.  The  user-
              names  may  also  contain  shell  wildcard  characters. If "auth
              users" is set then the client will be  challenged  to  supply  a
              username  and  password  to  connect  to the module. A challenge
              response authentication protocol is used for this exchange.  The
              plain text usernames and passwords are stored in the file speci-
              fied by the "secrets file" parameter. The  default  is  for  all
              users  to  be able to connect without a password (this is called
              "anonymous rsync").

              PROGRAM"  section  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 connect to an rsync

       secrets file
              This parameter specifies the name of a file  that  contains  the
              username: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 username:password
              pairs separated by a single colon. Any line starting with a hash
              (#)  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 passwords  longer  than  8  characters
              don't work.

              There  is  no default for the "secrets file" parameter, you must
              choose a name (such as /etc/rsyncd.secrets).  The file must nor-
              mally not be readable by "other"; see "strict modes".

       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  net-
                     mask.  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. The  hostname  as  determined  by  a  reverse
                     lookup  will  be  matched  (case insensitive) against the
                     pattern. Only an exact match is allowed in.

              o      a hostname pattern using  wildcards.  These  are  matched
                     using the same rules as normal unix filename matching. If
                     the pattern matches then the client is allowed in.

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


              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" pat-
              terns 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 connection  is  rejected.  See  the
              "hosts allow" parameter for more information.

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

       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 tempo-
              rary 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 somewhat 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"

       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").

              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

              o      %b the number of bytes actually transferred

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

              o      %c the checksum bytes received for this file  (only  when

              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

              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 --itemize-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.

              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 prevent 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 suffixes that are not  compressed  by  default.
              Specifying a value for the "dont compress" 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.

              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

              o      RSYNC_PID: A unique number for this transfer.

              o      RSYNC_REQUEST: (pre-xfer only) The module/path info spec-
                     ified  by the user (note that the user can specify multi-
                     ple 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  numbered  values.  RSYNC_ARG0  is  always
                     "rsyncd", and the last value contains a single period.

              o      RSYNC_EXIT_STATUS:  (post-xfer  only)  the  server side's
                     exit value.  This will be 0 for a successful run, a posi-
                     tive  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.

       The  authentication protocol used in rsync is a 128 bit MD4 based chal-
       lenge response system. 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  recommend  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

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

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

               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

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

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

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

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

               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:


       /etc/rsyncd.conf or rsyncd.conf


       Please  report  bugs!  The  rsync  bug  tracking  system  is  online at

       This man page is current for version 3.0.3 of rsync.

       rsync is distributed under the GNU public license.  See the file  COPY-
       ING 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 to Warren Stanley for his original idea and patch for the  rsync
       daemon.  Thanks  to Karsten Thygesen for his many suggestions and docu-

       rsync was written by Andrew Tridgell and Paul Mackerras.   Many  people
       have later contributed to it.

       Mailing   lists   for   support   and   development  are  available  at

                                  29 Jun 2008                   rsyncd.conf(5)