centos7.2下安装mysql5.7，使用rpm包安装

少perl和libaio软件包yum install perlyum install libaio然后yum安装net-tools   yum install net-tools  完成之后就可以顺利安装4、数据库初始化为了保证数据库目录为与文件的所有者为 mysql 登陆用户，如果你是以 root 身份运行 mysql 服务，需要执行下面的命令初始化mysqld --initialize --user=mysql  如果是以 mysql 身份运行，则可以去掉 --user 选项。  另外 --initialize 选项默认以“安全”模式来初始化，则会为 root 用户生成一个密码并将该密码标记为过期，登陆后你需要设置一个新的密码，而使用 --initialize-insecure 命令则不使用安全模式，则不会为 root 用户生成一个密码。  这里演示使用的 --initialize 初始化的，会生成一个 root 账户密码，密码在log文件里，红色区域的就是自动生成的密码  [root@linux_node_1 src]# cat /var/log/mysqld.log   2016-12-07T04:41:58.028558Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is dePRecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).  2016-12-07T04:41:58.315188Z 0 [Warning] InnoDB: New log files created, LSN=45790  2016-12-07T04:41:58.355114Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.  2016-12-07T04:41:58.418448Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: 7cc98831-bc37-11e6-a263-000c29f902dc.  2016-12-07T04:41:58.419935Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.  2016-12-07T04:41:58.420558Z 1 [Note] A temporary passWord is generated for root@localhost: )1r3gi,hjgQa  现在启动mysql数据库systemctl start mysqld.service  [root@linux_node_1 src]# systemctl start mysqld.service  [root@linux_node_1 src]# mysql -uroot -p  Enter password:   Welcome to the MySQL monitor.  Commands end with ; or /g.  Your MySQL connection id is 2  Server version: 5.7.16  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>   5、修改密码   该密码被标记为过期了，如果想正常使用还需要修改密码 mysql> show databases;ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.   以前的 password()函数将会被抛弃，官方建议使用下面的命令来修改密码 mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';   同时，如果你设置的密码过于简单也会报错。 mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123';ERROR 1819 (HY000): Your password does not satisfy the current policy requirements