在Centos7上安装Percona 5.7

作者：【吴业亮】云计算开发工程师
博客：http://blog.csdn.net/wylfengyujiancheng

在openstack集群非常大的情况下mysql5.5的最大连接数就成了问题（1040，Too many connections），dashboard界面操作经常因为连接不 上数据库报各种错误。经过试验将最大连接数改为2000，超时时间改为300s，问题还依旧。
针对这种问题，Percona 推出了新版本Percona 5.7.10-1
具体参见
https://www.percona.com/doc/percona-server/5.7/reliability/log_connection_error.html

下面具体介绍Percona 5.7.10-1安装方法
1、安装数据库源

# yum install http://www.percona.com/downloads/percona-release/redhat/0.1-3/percona-release-0.1-3.noarch.rpm

2、安装Percona 5.7

# yum install Percona-Server-server-57

3、启动数据库并设置开机启动

# service mysqld restart # chkconfig mysqld on

4、初始化数据库

[root@localhost Percona-db]# mysql_secure_installation Securing the MySQL server deployment.Enter password for user root: The existing password for the user account root has expired. Please set a new password.New password: Re-enter new password: The 'validate_password' plugin is installed on the server.The subsequent steps will run with the existing configurationof the plugin.Using existing password for root.Estimated strength of the password: 100 Change the password for root ? ((Press y|Y for Yes, any other key for No) : yNew password: Re-enter new password: Estimated strength of the password: 100 Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : yBy default, a MySQL installation has an anonymous user,allowing anyone to log into MySQL without having to havea user account created for them. This is intended only fortesting, and to make the installation go a bit smoother.You should remove them before moving into a productionenvironment.Remove anonymous users? (Press y|Y for Yes, any other key for No) : ySuccess.Normally, root should only be allowed to connect from'localhost'. This ensures that someone cannot guess atthe root password from the network.Disallow root login remotely? (Press y|Y for Yes, any other key for No) : ySuccess.By default, MySQL comes with a database named 'test' thatanyone can access. This is also intended only for testing,and should be removed before moving into a productionenvironment.Remove test database and access to it? (Press y|Y for Yes, any other key for No) : y - Dropping test database...Success. - Removing privileges on test database...Success.Reloading the privilege tables will ensure that all changesmade so far will take effect immediately.Reload privilege tables now? (Press y|Y for Yes, any other key for No) : ySuccess.All done! 

注意：Percona 5.7安装完默认会产生个随机的密码，存在日志中。这个问题曾困扰我一下午。
查看方法：

# cat /var/log/mysqld.log  | grep "A temporary password" | awk -F " " '{print$11}'

5、测试

[root@localhost ~]# mysql -uroot -pChangeme_123mysql: [Warning] Using a password on the command line interface can be insecure.Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 12Server version: 5.7.11-4 Percona Server (GPL), Release 4, Revision 5c940e1Copyright (c) 2009-2016 Percona LLC and/or its affiliatesCopyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> mysql> mysql> 

参考：
https://www.percona.com