centos7上如何配置MySQL5.7的开机自启动

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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)

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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