CentOS7下/etc/rc.local开启自启不执行问题处理

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 ~]#