CentOS7 卸载mariadb 安装mysql的过程:

1. 检查安装的mariadb 

rpm -qa |grep mariadb

得到已经安装的安装包

mariadb-libs-5.5.56-2.el7.x86_64
mariadb-devel-5.5.56-2.el7.x86_64
mariadb-server-5.5.56-2.el7.x86_64
mariadb-5.5.56-2.el7.x86_64

执行卸载的操作:

rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64
rpm -e --nodeps mariadb-devel-5.5.56-2.el7.x86_64
rpm -e --nodeps mariadb-server-5.5.56-2.el7.x86_64
rpm -e --nodeps mariadb-5.5.56-2.el7.x86_64

2. 安装mysql

下载rpm 生成repo文件:

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm

rpm -vih  mysql-community-release-el7-5.noarch.rpm

3. yum 安装mysql

yum install mysql-server

4.中间注意事项:

如果提示没有安装 perf的话可以安装 

yum install perl-JSON.noarch

如果python已经升级到了3.6 需要修改yum的配置文件:

修改文件/usr/bin/yum、/usr/libexec/urlgrabber-ext-down头中相应python为#!/usr/bin/python2.7

5. 安装完成之后启动mysql

systemctl start mysql

6.改root用户增加权限以及修改密码 在用户下执行 mysql

grant all privileges on *.* to ‘root‘@‘%‘ 

update user set password=password(‘Test6530‘) where user=‘root‘

flush privileges

7.修改字符集:

vim /etc/my.conf

修改主要地方为

[mysqld]
character-set-server=utf8 
collation-server=utf8_general_ci 
sql_mode=‘NO_ENGINE_SUBSTITUTION‘

[mysql]
default-character-set = utf8

[mysql.server]
default-character-set = utf8


[mysqld_safe]
default-character-set = utf8


[client]
default-character-set = utf8

可用状态.