CentOS7开始使得以往老版本系统服务的/etc/init.d的启动脚本的方式就此改变，在CentOS7中所有对服务的管理都集中到了systemctl当中。

systemctl是一个系统管理守护进程、工具和库的集合，用于取代以往的System V、service和chkconfig命令。

创建用于启动MySQL的配置文件

[root@localhost ~]# touch /usr/lib/systemd/system/mysqld.service

[root@localhost ~]# cd /usr/lib/systemd/system

编辑mysqld.service文件，加入如下内容:

[root@localhost system]# vi mysqld.service

[Unit]

Description=MySQL Server

Documentation=man:mysqld(8)

Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html

After=network.target

After=syslog.target

[Install]

WantedBy=multi-user.target

[Service]

User=mysql

Group=mysql

ExecStart=/opt/mysql-5.7.18/bin/mysqld --defaults-file=/etc/my.cnf

LimitNOFILE = 5000

保存退出

备注:ExecStart=/opt/mysql-5.7.18/bin/mysqld (此处请对应修改为MySQL程序所在的路径)

查找mysqld路径,例如:

[root@localhost system]# which mysqld

/opt/mysql-5.7.18/bin/mysqld

通过systemctl方式启动mysql5.7:

[root@localhost system]# systemctl start mysqld

检查MySQL运行状态:

[root@localhost system]# mysql -p

Enter password:

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 6

Server version: 5.7.18-log MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

mysql>

mysql> \s

--------------

mysql  Ver 14.14 Distrib 5.7.18, for linux-glibc2.5 (x86_64) using  EditLine wrapper

Connection id: 6

Current database:

Current user: root@localhost

SSL: Not in use

Current pager: stdout

Using outfile: ''

Using delimiter: ;

Server version: 5.7.18-log MySQL Community Server (GPL)

Protocol version: 10

Connection: Localhost via UNIX socket

Server characterset: latin1

Db    characterset: latin1

Client characterset: utf8

Conn.  characterset: utf8

UNIX socket: /tmp/mysql.sock

Uptime: 45 sec

Threads: 3  Questions: 6  Slow queries: 0  Opens: 108  Flush tables: 1  Open tables: 101  Queries per second avg: 0.133

--------------

mysql>

关闭防火墙:

[root@localhost system]# systemctl stop firewalld.service

[root@localhost system]# systemctl disable firewalld.service

Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.

Removed symlink /etc/systemd/system/dbus-org.Fedoraproject.FirewallD1.service.

设置mysql的开机启动：

[root@localhost system]# systemctl enable mysqld

Created symlink from /etc/systemd/system/multi-user.target.wants/mysqld.service to /usr/lib/systemd/system/mysqld.service.

[root@localhost system]# systemctl list-unit-files | grep mysqld

mysqld.service                                enabled

取消mysql的开机自启动:

[root@localhost system]# systemctl disable mysqld

Removed symlink /etc/systemd/system/multi-user.target.wants/mysqld.service.

[root@localhost system]# systemctl list-unit-files | grep mysqld

mysqld.service                                disabled

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