转自：https://blog.csdn.net/skykingf/article/details/45225981
如何用Systemd管理 general 包安装的MySQL呢？
首先看看yum安装的MySQL提供的Systemd管理脚本
$ cat /usr/lib/systemd/system/mysqld.service
#
# Simple MySQL systemd service file
#
# systemd supports lots of fancy features, look here (and linked docs) for a full list:
# http://www.freedesktop.org/software/systemd/man/systemd.exec.html
#
# Note: this file ( /usr/lib/systemd/system/mysql.service )
# will be overwritten on package upgrade, please copy the file to
#
# /etc/systemd/system/mysql.service
#
# to make needed changes.
#
# systemd-delta can be used to check differences between the two mysql.service files.
# [Unit]
Description=MySQL Community Server
After=network.target
After=syslog.target [Install]
WantedBy=multi-user.target
Alias=mysql.service [Service]
User=mysql
Group=mysql # Execute pre and post scripts as root
PermissionsStartOnly=true # Needed to create system tables etc.
ExecStartPre=/usr/bin/mysql-systemd-start pre # Start main service
ExecStart=/usr/bin/mysqld_safe # Don't signal startup success before a ping works
ExecStartPost=/usr/bin/mysql-systemd-start post # Give up if ping don't get an answer
TimeoutSec=600 Restart=always
PrivateTmp=false
适当修改 /lib/systemd/system/mysqld.service 如下：
After=network.target
After=syslog.target
[Install]
WantedBy=multi-user.target
Alias=mysql.service
[Service]
User=mysql
Group=mysql
PermissionsStartOnly=true
ExecStart=/usr/local/mysql/bin/mysqld_safe
TimeoutSec=600
Restart=always
PrivateTmp=false
然后
ln -s /lib/systemd/system/mysqld.service /etc/systemd/mysqld.service
ln -s /lib/systemd/system/mysqld.service /etc/systemd/mysqld.service
然后 使用 systemctl 设置 mysqld.service自动启动
systemctl enable mysqld.service
查看是否设置成：
systemctl 常见用法：
开机启动：
systemctl enable ***.service
停止开机启动：
systemctl disable ***.service
启动/停止/重启服务：
systemctl start/stop/restart ***.service
查询服务状态：
systemctl status ***.service
列出系统服务，-t后用tab键可以关联出所有支持的unit类型
查询某项服务是否active,以sshd.serice为例
systemctl is-active sshd.service
直接查看某项服务的配置文件,以mysqld.serice为例
查看环境变量