linux(centos7)中yum安装mysql

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一.卸载MYSQL

查看是否安装了MySQL

• 执行命令

yum remove mysql-community mysql-community-server mysql-community-libs mysql-community-common
yum remove -y mariadb-libs
rpm -qa | grep mysql

• 执行过程

[root@localhost ~]# rpm -qa | grep mysql
mysql-community-libs-5.7.19-1.el7.x86_64
mysql-community-server-5.7.19-1.el7.x86_64
mysql-community-common-5.7.19-1.el7.x86_64
mysql-community-client-5.7.19-1.el7.x86_6412345

查看MySQL服务是否启动，关闭

# 查看mysql服务状态
service mysqld status
​
# 关闭mysql服务
service mysqld stop12345

卸载MySQL安装的组件

由于依赖关系，所以要按顺序卸载。 需要注意的是：安装的时候是带rpm后缀的，但是卸载时不带的。

rpm -ev mysql-community-server-5.7.19-1.el7.x86_64
rpm -ev mysql-community-client-5.7.19-1.el7.x86_64
rpm -ev mysql-community-libs-5.7.19-1.el7.x86_64
rpm -ev mysql-community-common-5.7.19-1.el7.x86_641234

查找并删除MySQL相关的文件

• 执行命令

whereis mysql
​
find / -name mysql

• 执行过程

[root@localhost ~]# whereis mysql
mysql: /usr/share/mysql
[root@localhost ~]# find / -name mysql
/var/lib/mysql
/var/lib/mysql/mysql
/usr/share/mysql

• 删除MySQL相关的文件

rm -rf /var/lib/mysql/
rm -rf /usr/share/mysql/
​
# 删除日志文件
rm -rf /var/log/mysqld.log12345

• 查看是否已经删除

rpm -qa | grep mysql
whereis mysql
find / -name mysql

• 删除配置文件

rm -rf /etc/my*

如果是mariadb ,将以上语句中的mysql替换成mariadb

二.下载(https://repo.mysql.com/)

• el6

wget https://repo.mysql.com//mysql57-community-release-el6-11.noarch.rpm

• el7

wgethttps://repo.mysql.com//mysql57-community-release-el7-11.noarch.rpm

三.安装

rpm -ivh mysql57-community-release-el7-11.noarch.rpm 
​
yum install mysql-community-{server,client,common,libs}-*

四.启动

service mysqld start(centos6) / systemctl start mysqld(centos7)

• 找出root的密码

grep 'temporary password' /var/log/mysqld.log
ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';
​
mysql -uroot -p
​
ALTER USER 'root'@'localhost' IDENTIFIED BY '新密码';  -- 修改用户密码

• 设置允许远程访问

grant all privileges on *.* to 'root'@'%' identified by 'password' with grant option;