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 configuration of 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) : y New 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) : y By default, a MySQL installation has an anonymous user, allowing anyone to log into MySQL without having to have a user account created for them. This is intended only for testing, and to make the installation go a bit smoother. You should remove them before moving into a production environment. Remove anonymous users? (Press y|Y for Yes, any other key for No) : y Success. Normally, root should only be allowed to connect from 'localhost'. This ensures that someone cannot guess at the root password from the network. Disallow root login remotely? (Press y|Y for Yes, any other key for No) : y Success. By default, MySQL comes with a database named 'test' that anyone can access. This is also intended only for testing, and should be removed before moving into a production environment. 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 changes made so far will take effect immediately. Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y Success. 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_123
mysql: [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 12
Server version: 5.7.11-4 Percona Server (GPL), Release 4, Revision 5c940e1

Copyright (c) 2009-2016 Percona LLC and/or its affiliates
Copyright (c) 2000, 2016, 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> 
mysql> 
mysql> 

参考：
https://www.percona.com