Rsync服务常见问题汇总讲解：

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1. rsync服务端开启的iptables防火墙

 客户端的错误现象：No route to host

 [root@nfs01 tmp]# rsync -avz /etc/hosts rsync_backup@172.16.1.41::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]

 异常问题解决：

 关闭rsync服务端的防火墙服务（iptables）

 [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. rsync客户端执行rsync命令错误：

 客户端的错误现象：

 [root@nfs01 tmp]# rsync -avz /etc/hosts rsync_backup@172.16.1.41::/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]

 异常问题解决：

 rsync命令语法理解错误，::/backup是错误的语法，应该为::backup(rsync模块)

3. @ERROR: auth failed on module oldboy

 客户端的错误现象：

 [root@nfs01 tmp]# rsync -avz /etc/hosts rsync_backup@172.16.1.41::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]

 异常问题解决：

 1. 密码真的输入错误，用户名真的错误

 2. secrets file = /etc/rsync.password指定的密码文件和实际密码文件名称不一致

 3. /etc/rsync.password文件权限不是600

 4. rsync_backup:123456密码配置文件后面注意不要有空格

 5. rsync客户端密码文件中只输入密码信息即可，不要输入虚拟认证用户名称

4. Unknown module 'backup'

[root@nfs01 tmp]# rsync -avz /etc/hosts rsync_backup@172.16.1.41::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配置文件模块名称书写错误

5. Permission denied

[root@nfs01 tmp]# rsync -avz /etc/hosts rsync_backup@172.16.1.41::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. 共享目录的属主和属组不正确，不是rsync

 2. 共享目录的权限不正确，不是755

6. chdir failed  

[root@nfs01 tmp]# rsync -avz /etc/hosts rsync_backup@172.16.1.41::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. 备份存储目录没有建立

  2. 建立的备份存储目录和配置文件定义不一致

[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  ]

说明：如果没有备份存储目录，xinetd服务都不能正确启动

7. invalid uid rsync

[root@nfs01 tmp]# rsync -avz /etc/hosts rsync_backup@172.16.1.41::backup

Password:

@ERROR: invalid uid rsync

rsync error: error starting client-server protocol (code 5) at main.c(1503) [sender=3.0.6]

  异常问题解决：

rsync服务对应rsync虚拟用户不存在了

8. 客户端已经配置了密码文件，但免秘钥登录方式，依旧需要输入密码

 password file must not be other-accessible

[root@nfs01 tmp]# rsync -avz /etc/hosts rsync_backup@172.16.1.41::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

  异常问题解决：

rsync客户端的秘钥文件也必须是600权限

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

  异常问题解决：

查看日志进行分析

10 rsync服务没有正确启动

Connection refused (111)

[root@oldboy-muban ~]#  rsync -avz /etc/hosts rsync_backup@172.16.1.41::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 rsync_backup@172.16.1.41::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

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