单机版的mysql安装

查是否安装了mysql:
centos6:
rpm -qa |grep mysql
centos7:
rpm -qa|grep mariadb
或rpm -qa |grep mysql

有老的版本可以执行命令卸载：

rpm -e --nodeps mysql-libs

1、

cat > /etc/yum.repos.d/mysql-community-el7.repo<<'EOF'

[mysql57-community]

name=MySQL 5.7 Community Server

baseurl=http://mirror.tuna.tsinghua.edu.cn/mysql/yum/mysql57-community-el7/

enabled=1

gpgcheck=0

EOF

2.

yum install mysql-community-server -y

systemctl restart mysqld

# mysqld.log中查询密码

grep password /var/log/mysqld.log 

2019-04-09T07:28:44.292450Z 1 [Note] A temporary password is generated for root@localhost: wg:V45ci4ljpz!r

3.改/etc/my.cnf

4.重启 

#登陆后修改成自己的密码:

mysql> alter user user() identified by 'test123456';

 5、 查看授权情况

select user,host from mysql.user;