安装mysql

1. 登陆mysql网站点我。导航到Download MySQL Community Server。

选择mysql版本，然后选择操作系统 选择红帽Linux的操作系统

2. 使用yum 下载安装。

例子：
yum install -y https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-libs-5.7.22-1.el6.x86_64.rpm https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-common-5.7.22-1.el6.x86_64.rpm https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-client-5.7.22-1.el6.x86_64.rpm https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-server-5.7.22-1.el6.x86_64.rpm

使用yum按顺序下载这几个包，如果安装错误可以在这里查找依赖重新下载

3. 下载安装后使用命令rpm -qa|grep mysql查看

mysql-community-common-5.7.22-1.el6.x86_64
mysql-community-client-5.7.22-1.el6.x86_64
mysql-community-libs-5.7.22-1.el6.x86_64
mysql-community-server-5.7.22-1.el6.x86_64

4. mysql初始化

[root@xxx log]# service mysqld start
Initializing MySQL database:                               [  OK  ]
Starting mysqld:                                           [  OK  ]

5. 输入命令mysql --version

mysql  Ver 14.14 Distrib 5.7.22, for Linux (x86_64) using  EditLine wrapper

复制粘贴安装mysql....有没有兴趣粘贴过去试试

yum install -y https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-libs-5.7.22-1.el6.x86_64.rpm https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-common-5.7.22-1.el6.x86_64.rpm https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-client-5.7.22-1.el6.x86_64.rpm https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-server-5.7.22-1.el6.x86_64.rpm

配置mysql

1. 设置密码请看我的这篇文章
2. 配置MySQL的配置文件my.cnf

vi /etc/my.cnf

把下面的粘贴过去。
[client]
default-character-set = utf8mb4

[mysql]
default-character-set = utf8mb4

[mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_general_ci
init_connect='SET NAMES utf8mb4'
max_connections = 1000
#数据库主动链接超时，半年时间
wait_timeout = 15811200

粘贴好后 退出 vim
重启mysql
service  mysqld restart

删除mysql

1. 停止mysql服务

service mysqld stop

2. 列出名叫mysql的已安装的包。

[root@xxx ~]# rpm -qa|grep mysql
mysql-community-common-5.7.22-1.el6.x86_64
mysql-community-client-5.7.22-1.el6.x86_64
mysql-community-libs-5.7.22-1.el6.x86_64
mysql-community-server-5.7.22-1.el6.x86_64

3. 使用yum remove命令删除它们

yum remove mysql-community-common-5.7.22-1.el6.x86_64 mysql-community-client-5.7.22-1.el6.x86_64 ... ... ... ... 

4. 找到mysql的残留文件夹

find / -name mysql 

/usr/lib64/mysql
/usr/share/mysql
/usr/bin/mysql
/etc/logrotate.d/mysql
/var/lib/mysql
/var/lib/mysql/mysql

rm -rf /usr/bin/mysql /var/lib/mysql ... ... ...

5. 找到日志文件删除掉

rm -f /var/log/mysqld.log

完毕