1. rsync服务端开启的iptables防火墙

【客户端的错误】

1	No route to host

【错误演示过程】

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[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】

1	The remote path must start with a module name not a /

【错误演示过程】

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[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. rsync服务认证用户失败*****

【客户端的错误】

1	auth failed on module oldboy

【错误演示过程】

[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】

密码真的输入错误，用户名真的错误
secrets file = /etc/rsync.password指定的密码文件和实际密码文件名称不一致
/etc/rsync.password文件权限不是600
rsync_backup:123456密码配置文件后面注意不要有空格
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. rsync服务位置模块错误

【客户端的错误】

1	Unknown module 'backup'

【错误演示过程】

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[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】
/etc/rsyncd.conf配置文件模块名称书写错误

5. rsync服务权限阻止问题

【客户端的错误】

1	Permission denied

【错误演示过程】

[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】

备份目录的属主和属组不正确，不是rsync
备份目录的权限不正确，不是755

6. rsync服务备份目录异常

【客户端的错误】

1	chdir failed

【错误演示过程】

[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】

备份存储目录没有建立
建立的备份存储目录和配置文件定义不一致
说明：如果没有备份存储目录

7. rsync服务无效用户信息

【客户端的错误】

1	invalid uid rsync

【错误演示过程】

[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

【客户端的错误】

1	password file must not be other-accessible

【错误演示过程】

[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

IP === 域名反向DNS解析
【错误日志信息】

#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，编写rsync服务端hosts解析文件

10 rsync服务没有正确启动

【错误日志信息】

1	Connection refused (111)

【错误演示过程】

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[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]

【异常问题解决】

[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