RHEL7: How to configure a rc-local service

Posted 2021-01-20 dataart

问题: linux7 /etc/rc.local 不生效：

[[email protected] mysql3306]# uname -a
Linux bogon 3.10.0-862.el7.x86_64 #1 SMP Fri Apr 20 16:44:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

在/etc/rc.local上添加如下部分，重启后没有生效：

if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
 echo never > /sys/kernel/mm/transparent_hugepage/enabled
fi
if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
 echo never > /sys/kernel/mm/transparent_hugepage/defrag
fi

[[email protected] mysql3306]# cat /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.

 

解决方法：

(1) chmod +x /etc/rc.d/rc.local

(2) systemctl enable rc-local

 

[[email protected] software]# systemctl status rc-local

● rc-local.service - /etc/rc.d/rc.local Compatibility
   Loaded: loaded (/usr/lib/systemd/system/rc-local.service; static; vendor preset: disabled)
   Active: active (exited) since Sun 2018-11-18 17:27:56 CST; 1h 9min ago
  Process: 1039 ExecStart=/etc/rc.d/rc.local start (code=exited, status=0/SUCCESS)
    Tasks: 0

Nov 18 17:27:56 bogon systemd[1]: Starting /etc/rc.d/rc.local Compatibility...
Nov 18 17:27:56 bogon systemd[1]: Started /etc/rc.d/rc.local Compatibility.
[[email protected] software]#

 

(3) systemctl start rc-local

 

(4) 验证生效：

[[email protected] ~]# cat /sys/kernel/mm/transparent_hugepage/defrag
always madvise [never]
[[email protected] ~]# cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]
[[email protected] ~]#

(5) 重启后验证依然生效