CentOS 7 Linux 卸载/安装 Mariadb MySQL mysql 5.7

 [root@localhost mysql]# ls
 mysql-community-client-5.7.-.el7.x86_64.rpm
 mysql-community-embedded-compat-5.7.-.el7.x86_64.rpm
 mysql-community-minimal-debuginfo-5.7.-.el7.x86_64.rpm
 mysql-community-common-5.7.-.el7.x86_64.rpm
 mysql-community-embedded-devel-5.7.-.el7.x86_64.rpm
 mysql-community-server-5.7.-.el7.x86_64.rpm
 mysql-community-devel-5.7.-.el7.x86_64.rpm
 mysql-community-libs-5.7.-.el7.x86_64.rpm
 mysql-community-server-minimal-5.7.-.el7.x86_64.rpm
 mysql-community-embedded-5.7.-.el7.x86_64.rpm
 mysql-community-libs-compat-5.7.-.el7.x86_64.rpm
 [root@localhost mysql]# rpm -qa | grep mariadb
 mariadb-5.5.-.el7.x86_64
 mariadb-server-5.5.-.el7.x86_64
 mariadb-devel-5.5.-.el7.x86_64
 mariadb-libs-5.5.-.el7.x86_64
 [root@localhost mysql]# rpm -e akonadi-mysql-1.9.-.el7.x86_64
 [root@localhost mysql]# rpm -e mariadb-server-:5.5.-.el7.x86_64
 [root@localhost mysql]# rpm -e mariadb-devel-5.5.-.el7.x86_64
 [root@localhost mysql]# rpm -e mariadb-5.5.-.el7.x86_64
 [root@localhost mysql]# rpm -e perl-DBD-MySQL-4.023-.el7.x86_64
 [root@localhost mysql]# rpm -e qt-mysql-:4.8.-.el7.x86_64
 [root@localhost mysql]# rpm -e --nodeps mariadb-libs-5.5.-.el7.x86_64
 [root@localhost mysql]# rpm -e qt3-MySQL-3.3.8b-.el7.x86_64
 [root@localhost mysql]# rpm -e qt5-qtbase-mysql-5.6.-.el7.x86_64
 [root@localhost mysql]# rpm -e MySQL-python-1.2.-.el7.x86_64
 [root@localhost mysql]# rpm -qa | grep mariadb
 [root@localhost mysql]# rpm -qa | grep mysql
 #至此完全卸载mariadb/mysql
 [root@localhost mysql]# rpm -ivh mysql-community-common-5.7.-.el7.x86_64.rpm
 [root@localhost mysql]# rpm -ivh mysql-community-libs-5.7.-.el7.x86_64.rpm
 [root@localhost mysql]# rpm -ivh mysql-community-client-5.7.-.el7.x86_64.rpm
 [root@localhost mysql]# rpm -ivh mysql-community-server-5.7.-.el7.x86_64.rpm
 警告：mysql-community-server-5.7.-.el7.x86_64.rpm: 头V3 DSA/SHA1 Signature, 密钥 ID 5072e1f5: NOKEY
 准备中...                          ################################# [%]
 正在升级/安装...
    :mysql-community-server-5.7.-.e################################# [%]
 [root@localhost mysql]# systemctl start mysqld
 [root@localhost mysql]# chkconfig mysqld on
 注意：正在将请求转发到“systemctl enable mysqld.service”。

 #[root@localhost mysql]# rpm -ivh *rpm
 [root@localhost mysql]# /bin/systemctl start  mysqld.service
 [root@localhost mysql]# sudo grep 'temporary password' /var/log/mysqld.log
 --05T05::.125123Z  [Note] A temporary password is generated for root@localhost: S2ZiNLyjLw,o
 [root@localhost mysql]# mysql -uroot -p
 Enter password:
 Welcome to the MySQL monitor.  Commands end with ; or \g.
 Your MySQL connection id is
 Server version: 5.7.

 Copyright (c) , , Oracle and/or its affiliates. All rights reserved.

 Oracle is a registered trademark of Oracle Corporation and/or its
 affiliates. Other names may be trademarks of their respective
 owners.

 Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

 mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';
 Query OK,  rows affected (0.01 sec)

 mysql> exit
 Bye
 # 停止MYSQL
 [root@localhost mysql]# mysqladmin -p -u root shutdown
 Enter password: