linux系统下，安装mysql教程

1、查看mysql是否安装
首先我们需要查看软件是否已经安装，或者说查看安装的软件包名称。如查找是否安装mysql
rpm -qa | grep mysql

2、卸载查到的软件
rpm -e --nodeps mysql-community-release-el7-5.noarch

3、下载mysql的repo源
wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm

4、安装mysql源
rpm -ivh mysql-community-release-el7-5.noarch.rpm
如果出现下面报错：
error: Failed dependencies: mysql-community-release conflicts with (installed) mysql57-community-release-el7-10.noarch

解决方式，添加如下参数：
rpm -ivh mysql-community-release-el7-5.noarch.rpm --nodeps --force

5、开始安装mysql数据库
yum install mysql-server -y

如果出现如下报错：

2021-11-07T03:06:04.715107Z 0 [ERROR] [MY-010460] [Server] --initialize specified but the data directory exists and is not writable. Aborting.
2021-11-07T03:06:04.715141Z 0 [ERROR] [MY-013236] [Server] The designated data directory /var/lib/mysql/ is unusable. You can remove all files that the server added to it.
2021-11-07T03:06:04.715203Z 0 [ERROR] [MY-010119] [Server] Aborting

解决方式：
chown -R mysql:mysql /var/lib/mysql

6、重启服务
service mysqld restart

7、登录mysql数据库
mysql -u root -p

注意
第一次使用数据库登录的时候不用输入密码，因为还没有设置密码，直接回车进入数据库后再去修改密码.