Ubuntu 18.04 使用Systemd管理MySQL 5.6

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