rsync:
https://www.jb51.net/article/60194.htm
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 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】 The remote path must start with a module name not a / 【错误演示过程】 [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】 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】 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 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. 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 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. 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 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 说明：如果没有备份存储目录
7. rsync服务无效用户
【客户端的错误】 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】 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客户端的密码文件也必须是600权限
9. rsync 客户端连接慢的问题
【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 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