mysql安装

默认contos安装了mariadb
1. 卸载mariadb
查看是否安装：rpm -qa | grep mariadb
强制卸载，忽略依赖
rpm -e --nodeps mariadb-libs

2. 下载mysql
下载地址：https://downloads.mysql.com/archives/community/
选择版本：
Operating System:Red Hat Enterprise Linux / Oracle Linux
OS Version:Red Hat Enterprise Linux 7 / Oracle Linux 7 (x86, 64-bit)

wget "下载链接"下载到宿主机上

3. 解压
tar xf mysql-

4. 安装
分别安装以下内容：
rpm -ivh mysql-community-common-8
rpm -ivh mysql-community-client-plugins-8
rpm -ivh mysql-community-libs-8
rpm -ivh mysql-community-client-8
rpm -ivh mysql-community-icu-data-files-8
rpm -ivh mysql-community-server-8
//完整安装
rpm -ivh *.rpm --nodeps --force

5. 启动
systemctl start mysqld
systemctl status mysqld

6. 开机启动
systemctl enable mysqld

7. 查看初始密码
   cat /var/log/mysqld.log | grep password
8. 修改初始密码
   登录：mysql -u root -p
   alter user 'root'@'localhost' identified by '您的密码';