# yum list installed | grep mysql
mysql-libs.x86_64    5.1.71-1.el6  @anaconda-CentOS-201311272149.x86_64/6.5

# yum -y remove mysql-libs.x86_64 

# yum localinstall mysql80-community-release-el6-1.noarch.rpm

# ls /etc/yum.repos.d
mysql-community.repo    mysql-community-source.repo

# yum repolist enabled | grep mysql
mysql-connectors-community      MySQL Connectors Community       59
mysql-tools-community        MySQL Tools Community          65
mysql80-community          MySQL 8.0 Community Server       29

vim /etc/yum.repos.d/mysql-community.repo

......
# Enable to use MySQL 5.7
[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
 ......
[mysql80-community]
name=MySQL 8.0 Community Server
baseurl=http://repo.mysql.com/yum/mysql-8.0-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

# yum repolist enabled | grep mysql
mysql-connectors-community      MySQL Connectors Community       59
mysql-tools-community        MySQL Tools Community          65
mysql57-community          MySQL 5.7 Community Server       273

# yum install mysql-community-server

# service mysqld start
Initializing MySQL database: [FAILED]
# service mysqld start
Starting mysqld: [ OK ]

# cat /var/log/mysqld.log | grep root@localhost
2018-08-29T03:11:26.560863Z 1 [Note] A temporary password is generated for root@localhost: DJ#erA*-p6&"color: #800000">DJ#erA*-p6&"htmlcode">

mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql> set password=password('new_password');
Query OK, 0 rows affected, 1 warning (0.01 sec)
 
mysql> alter user 'root'@'localhost' password expire never;
Query OK, 0 rows affected (0.00 sec)
 
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)


再退出mysql，使用新密码重新登陆即可。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。