Rsync服务场景问题及解决方法

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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
   [iyunv@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）
   [iyunv@backup mnt]# /etc/init.d/iptables stop
   iptables: Setting chains to policy ACCEPT: filter          [  OK  ]
   iptables: Flushing firewall rules:                         [  OK  ]
   iptables: Unloading modules:                               [  OK  ]
   [iyunv@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：   
   [iyunv@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：
   [iyunv@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'   
[iyunv@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
[iyunv@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   
[iyunv@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
[iyunv@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
[iyunv@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
[iyunv@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)
[iyunv@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
[iyunv@oldboy-muban ~]# rsync --daemon
[iyunv@oldboy-muban ~]# ss -lntup |grep rsync
tcp    LISTEN     0      5                     :::873                  :::*      users:(("rsync",1434,5))
tcp    LISTEN     0      5                      *:873                   *:*      users:(("rsync",1434,4))
[iyunv@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