rsync:
https://www.jb51.net/article/60194.htm
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/selinux没关
【客户端的错误】
No route to host
【错误演示过程】
[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]
【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】
The remote path must start with a module name not a /
【错误演示过程】
[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]
【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】
auth failed on module oldboy
【错误演示过程】
[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]
【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 信息复制粘贴
3. /etc/rsync.password文件权限不是600 服务端
4. rsync_backup:123456 密码配置文件后面注意不要有空格
如何看出文件结尾空格信息：
方法一：在vim编辑中查看
底行模式---:set list
方法二：在cat命令中查看
[root@backup ~]# cat -A /etc/rsync.password
rsync_backup:oldboy123 $
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. rsync服务位置模块错误
【客户端的错误】
Unknown module 'backup'
【错误演示过程】
[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】
Permission denied
【错误演示过程】
[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. 备份目录的属主和属组不正确，不是rsync
2. 备份目录的权限不正确，不是777
3. 配置文件中是否开启只读配置
6. rsync服务备份目录异常
【客户端的错误】
chdir failed
【错误演示过程】
[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. 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
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】
invalid uid rsync
【错误演示过程】
[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]
【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】
password file must not be other-accessible
【错误演示过程】
[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
【异常问题解决】
rsync客户端的密码文件也必须是600权限
9. rsync客户端连接慢问题
【错误日志信息】 名称或者域名 --- IP dns解析
错误日志输出 IP --- 名称或者域名 反向dns解析
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
DNS反向解析过程 IP ---> 名称
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 nfs01 (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
客户端 10.0.0.31 ---> 服务端 识别源地址 10.0.0.31 - RDNS(反向dns解析)
10 rsync服务没有正确启动
【错误日志信息】
Connection refused (111)
【错误演示过程】
[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]
【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 [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