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1、先卸载原有版本mysql
rpm -qa|grep mysql 
[root@monit usr]# rpm -qa|grep mysql 
mysql-5.1.71-1.el6.x86_64      --卸载
mysql-libs-5.1.71-1.el6.x86_64   --卸载
mysql57-community-release-el6-11.noarch
qt-mysql-4.6.2-26.el6_4.x86_64
mysql-server-5.1.71-1.el6.x86_64   --卸载


rpm -e mysql-5.1.71-1.el6.x86_64 --nodeps
rpm -e mysql-libs-5.1.71-1.el6.x86_64  --nodeps
rpm -e mysql-server-5.1.71-1.el6.x86_64  --nodeps


2解压并安装mysql5.7
[root@monit usr]# tar -xvf mysql-5.7.19-1.el6.x86_64.rpm-bundle.tar 
mysql-community-libs-5.7.19-1.el6.x86_64.rpm
mysql-community-devel-5.7.19-1.el6.x86_64.rpm
mysql-community-embedded-5.7.19-1.el6.x86_64.rpm
mysql-community-common-5.7.19-1.el6.x86_64.rpm
mysql-community-libs-compat-5.7.19-1.el6.x86_64.rpm
mysql-community-server-5.7.19-1.el6.x86_64.rpm
mysql-community-test-5.7.19-1.el6.x86_64.rpm
mysql-community-embedded-devel-5.7.19-1.el6.x86_64.rpm
mysql-community-client-5.7.19-1.el6.x86_64.rpm


安装顺序：
[root@monit usr]# rpm -ivh mysql-community-common-5.7.19-1.el6.x86_64.rpm 
[root@monit usr]# rpm -ivh mysql-community-libs*
[root@monit usr]# rpm -ivh mysql-community-devel-5.7.19-1.el6.x86_64.rpm 
[root@monit usr]# rpm -ivh mysql-community-embedded*
[root@monit usr]# rpm -ivh mysql-community-client-5.7.19-1.el6.x86_64.rpm 
[root@monit usr]# rpm -ivh mysql-community-server-5.7.19-1.el6.x86_64.rpm 


3、启动mysql服务，修改root密码
[root@monit usr]# service mysqld start
Initializing MySQL database:                               [  OK  ]
Starting mysqld:                                           [  OK  ]
[root@monit usr]# grep 'temporary password' /var/log/mysqld.log
2017-08-07T12:10:35.283652Z 1 [Note] A temporary password is generated for root@localhost: pC,s-ywwh6s9
[root@monit usr]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.19


Copyright (c) 2000, 2017, 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, 0 rows affected (0.00 sec)

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