Rsync service FAQ summary

1. The error phenomenon of the iptables firewall
   client opened by the rsync server: No route to host
   [root@nfs01 tmp]# rsync -avz /etc/hosts [email protected]::backup
   rsync: failed to connect to 172.16.1.41: No route to host (113)
   rsync error: error in socket IO (code 10) at clientserver.c(124) [sender=3.0.6]
   Abnormal problem solving:
   close the firewall service (iptables) of the rsync server
   [root@backup mnt]# /etc/init.d/iptables stop
   iptables: Setting chains to policy ACCEPT: filter [ OK ]
   iptables: Flushing firewall rules: [ OK ]
   iptables: Unloading modules: [ OK ]
   [root@backup mnt]# /etc/init. d/iptables status
   iptables: Firewall is not running.

2. The rsync client executes the rsync command error:
   The client's error phenomenon:
   [root@nfs01 tmp]# rsync -avz /etc/hosts [email protected]::/backup
   ERROR: The remote path must start with a module name not a /
   rsync error: error starting client-server protocol (code 5) at main.c(1503) [sender=3.0.6]
   Abnormal problem solving:
   The rsync command syntax is misunderstood, ::/backup is the wrong syntax, it should be :: backup (rsync module)

3. @ERROR: auth failed on module Oldboy
   client error phenomenon:
   [root@nfs01 tmp]# rsync -avz /etc/hosts [email protected]::backup
   Password:
   @ERROR: auth failed on module backup
   rsync error: error starting client-server protocol (code 5) at main.c(1503) [sender=3.0.6]
   Abnormal problem solving:

   1. The password is really wrong, the username is really wrong
   2. secrets file = The password file specified by /etc/rsync.password is inconsistent with the actual password file name
   3. /etc/rsync.password file permissions are not 600
   4. rsync_backup:123456 Be careful not to have spaces after the password configuration file
   5. Only enter the password information in the rsync client password file, do not enter the virtual authentication user name

4. Unknown module 'backup'
   [root@nfs01 tmp]# rsync -avz /etc/hosts [email protected]::backup
   @ERROR: Unknown module 'backup'
   rsync error: error starting client-server protocol (code 5) at main.c(1503) [sender=3.0.6]
   异常问题解决：

   1. /etc/rsyncd.conf configuration file module name writing error
5. Permission denied
   [root@nfs01 tmp]# rsync -avz /etc/hosts [email protected]::backup
   Password:
   sending incremental file list
   hosts
   rsync: mkstemp ".hosts.5z3AOA" (in backup) failed: Permission denied (13)

sent 196 bytes received 27 bytes 63.71 bytes/sec
total size is 349 speedup is 1.57
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1039) [sender=3.0.6]
异常问题解决：

1. Incorrect owner and group of shared directory, not rsync
2. Incorrect permissions on shared directory, not 755

6. chdir failed
   [root@nfs01 tmp]# rsync -avz /etc/hosts [email protected]::backup
   Password:
   @ERROR: chdir failed
   rsync error: error starting client-server protocol (code 5) at main.c(1503) [sender=3.0.6]
   异常问题解决：

   1. Backup storage directory not created
   2. The created backup storage directory is inconsistent with the configuration file definition
      [root@backup backup]# /etc/init.d/xinetd restart
      shell-init: error retrieving current directory: getcwd: cannot access parent directories: No such file or directory
      Stopping xinetd: [ OK ]
      Starting xinetd: shell-init: error retrieving current directory: getcwd: cannot access parent directories: No such file or directory
      [ OK ]
      Note: If the storage directory is not backed up, the xinetd service cannot be started correctly

7. invalid uid rsync
   [root@nfs01 tmp]# rsync -avz /etc/hosts [email protected]::backup
   Password:
   @ERROR: invalid uid rsync
   rsync error: error starting client-server protocol (code 5) at main.c (1503) [sender=3.0.6]
   Abnormal problem solved:
   The rsync virtual user corresponding to the rsync service no longer exists

8. The client has already configured a password file, but the keyless login method still needs to enter the password
   password file must not be other-accessible
   [root@nfs01 tmp]# rsync -avz /etc/hosts [email protected]::backup - -password-file=/etc/rsync.password
   password file must not be other-accessible
   continuing without password file
   Password:
   sending incremental file list

sent 26 bytes received 8 bytes 5.23 bytes/sec
total size is 349 speedup is 10.26
Abnormal problem solved:
The key file of the rsync client must also have 600 permissions

9. rsync客户端连接慢问题
   错误日志输出
   2017/03/08 20:14:43 [3422] params.c:Parameter() - Ignoring badly formed line in configuration file: ignore errors
   2017/03/08 20:14:43 [3422] name lookup failed for 172.16.1.31: Name or service not known
   2017/03/08 20:14:43 [3422] connect from UNKNOWN (172.16.1.31)
   2017/03/08 20:14:43 [3422] rsync to backup/ from rsync_backup@unknown (172.16.1.31)
   2017/03/08 20:14:43 [3422] receiving file list
   2017/03/08 20:14:43 [3422] sent 76 bytes received 83 bytes total size 349
   正确日志输出
   2017/03/08 20:16:45 [3443] params.c:Parameter() - Ignoring badly formed line in configuration file: ignore errors
   2017/03/08 20:16:45 [3443] connect from nfs02 (172.16.1.31)
   2017/03/08 20:16:45 [3443] rsync to backup/ from rsync_backup@nfs02 (172.16.1.31)
   2017/03/08 20:16:45 [3443] receiving file list
   2017/03/08 20:16 :45 [3443] sent 76 bytes received 83 bytes total size 349
   Abnormal problem solution:
   view the log for analysis

10 rsync服务没有正确启动
Connection refused (111)
[root@oldboy-muban ~]# rsync -avz /etc/hosts [email protected]::backup
rsync: failed to connect to 172.16.1.41: Connection refused (111)
rsync error: error in socket IO (code 10) at clientserver.c(124) [sender=3.0.6]
解决 rsync服务没开启
[root@oldboy-muban ~]# rsync --daemon
[root@oldboy-muban ~]# ss -lntup |grep rsync
tcp LISTEN 0 5 :::873 ::: users:(("rsync",1434,5))
tcp LISTEN 0 5 :873 : users:(("rsync",1434,4))
[root@oldboy-muban ~]# rsync -avz /etc/hosts [email protected]::backup
Password:
sending incremental file list
hosts

sent 196 bytes received 27 bytes 49.56 bytes/sec
total size is 349 speedup is 1.57