1、原因：服务器重启后rsync服务没有起来，rsync启动已经写入/etc/rc.local中
2：分析：查看more /etc/rc.local
写启动内容没问题，也是全路径；查看 /etc/rc.local 文件，是一个链接，链接到 /etc/rc.d/rc.local，查看 /etc/rc.d/rc.local 文件，发现没有执行权限。
[root@master ~]# more /etc/rc.local
#!/bin/bash
# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
#
# It is highly advisable to create own systemd services or udev rules
# to run scripts during boot instead of using this file.
#
# In contrast to previous versions due to parallel execution during boot
# this script will NOT be run after all other services.
#
# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
# that this script will be executed during boot.
touch /var/lock/subsys/local
/usr/local/sersync/bin/sersync2 -r -d -o /usr/local/sersync/conf/confxml.xml
[root@master ~]#
[root@slave ~]# more /etc/rc.local
#!/bin/bash
# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
#
# It is highly advisable to create own systemd services or udev rules
# to run scripts during boot instead of using this file.
#
# In contrast to previous versions due to parallel execution during boot
# this script will NOT be run after all other services.
#
# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
# that this script will be executed during boot.
touch /var/lock/subsys/local
rsync --daemon --config=/etc/rsyncd.conf
[root@slave ~]#
3、加上执行权限之后，再重启发现服务自动起来了。
[root@master ~]# chmod +x /etc/rc.d/rc.local
[root@master ~]# ll /etc/rc.d/rc.local
-rwxr-xr-x. 1 root root 527 Aug 17 2022 /etc/rc.d/rc.local
[root@master ~]# reboot
[root@slave ~]# lsof -i:873
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
rsync 888 root 4u IPv4 21280 0t0 TCP *:rsync (LISTEN)
rsync 888 root 5u IPv6 21281 0t0 TCP *:rsync (LISTEN)
[root@slave ~]#
[root@slave ~]# netstat -lntup | grep rsync
tcp 0 0 0.0.0.0:873 0.0.0.0:* LISTEN 888/rsync
tcp6 0 0 :::873 :::* LISTEN 888/rsync
[root@slave ~]#
标签：rsync,root,CentOS7,etc,自启,rc,during,local From： https://www.cnblogs.com/huazhixu/p/17251254.html