1. 1. 安装mysql源
    2.     - 下载安装包：wget [http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm](http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm)
    3.     - 安装：rpm -ivh [mysql-community-release-el7-5.noarch.rpm](http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm)
    4. 1. 安装MySQL：`yum -y install mysql-server`
    5. 2. 检查：`rpm -qa | grep mysql`
    7. ```text
    8. [root@localhost ~]# rpm -qa | grep mysql
    9. mysql-community-release-el7-5.noarch
    10. mysql-community-common-5.6.51-2.el7.x86_64
    11. mysql-community-libs-5.6.51-2.el7.x86_64
    12. mysql-community-server-5.6.51-2.el7.x86_64
    13. mysql-community-client-5.6.51-2.el7.x86_64
    1. 启动服务：systemctl start mysqld
    1. [root@localhost ~]# systemctl start mysqld
    2. [root@localhost ~]# 
    3. [root@localhost ~]# 
    4. [root@localhost ~]# systemctl status mysqld
    5. ● mysqld.service - MySQL Community Server
    6.    Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
    7.    Active: active (running) since 三 2021-12-15 20:48:14 CST; 18s ago
    8.   Process: 19849 ExecStartPost=/usr/bin/mysql-systemd-start post (code=exited, status=0/SUCCESS)
    9.   Process: 19786 ExecStartPre=/usr/bin/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
    10.  Main PID: 19848 (mysqld_safe)
    11.    CGroup: /system.slice/mysqld.service
    12.            ├─19848 /bin/sh /usr/bin/mysqld_safe --basedir=/usr
    13.            └─20015 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --log-error=/var/log/mysqld.log --pid-f...
    15. 12月 15 20:48:12 localhost.localdomain mysql-systemd-start[19786]: 2021-12-15 20:48:12 19824 [Note] InnoDB: Starting shutdown...
    16. 12月 15 20:48:13 localhost.localdomain mysql-systemd-start[19786]: 2021-12-15 20:48:13 19824 [Note] InnoDB: Shutdown completed; log sequence numb...625987
    17. 12月 15 20:48:13 localhost.localdomain mysql-systemd-start[19786]: PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
    18. 12月 15 20:48:13 localhost.localdomain mysql-systemd-start[19786]: To do so, start the server, then issue the following commands:
    19. 12月 15 20:48:13 localhost.localdomain mysql-systemd-start[19786]: /usr/bin/mysqladmin -u root password 'new-password'
    20. 12月 15 20:48:13 localhost.localdomain mysql-systemd-start[19786]: /usr/bin/mysqladmin -u root -h localhost.localdomain password 'new-password'
    21. 12月 15 20:48:13 localhost.localdomain mysql-systemd-start[19786]: Alternatively you can run:
    22. 12月 15 20:48:14 localhost.localdomain mysqld_safe[19848]: 211215 20:48:14 mysqld_safe Logging to '/var/log/mysqld.log'.
    23. 12月 15 20:48:14 localhost.localdomain mysqld_safe[19848]: 211215 20:48:14 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
    24. 12月 15 20:48:14 localhost.localdomain systemd[1]: Started MySQL Community Server.
    25. Hint: Some lines were ellipsized, use -l to show in full.
    26. [root@localhost ~]# 
    27. [root@localhost ~]# 
    28. [root@localhost ~]# netstat -tnlp
    29. Active Internet connections (only servers)
    30. Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
    31. tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1014/sshd           
    32. tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      1350/master         
    33. tcp6       0      0 :::8001                 :::*                    LISTEN      8863/httpd          
    34. tcp6       0      0 :::3306                 :::*                    LISTEN      20015/mysqld        
    35. tcp6       0      0 :::22                   :::*                    LISTEN      1014/sshd           
    36. tcp6       0      0 ::1:25                  :::*                    LISTEN      1350/master

    ```