少perl和libaio軟件包yum install perlyum install libaio然后yum安裝net-tools   yum install net-tools  完成之后就可以順利安裝4、數據庫初始化為了保證數據庫目錄為與文件的所有者為 mysql 登陸用戶，如果你是以 root 身份運行 mysql 服務，需要執行下面的命令初始化mysqld --initialize --user=mysql  如果是以 mysql 身份運行，則可以去掉 --user 選項。  另外 --initialize 選項默認以“安全”模式來初始化，則會為 root 用戶生成一個密碼并將該密碼標記為過期，登陸后你需要設置一個新的密碼，而使用 --initialize-insecure 命令則不使用安全模式，則不會為 root 用戶生成一個密碼。  這里演示使用的 --initialize 初始化的，會生成一個 root 賬戶密碼，密碼在log文件里，紅色區域的就是自動生成的密碼  [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  現在啟動mysql數據庫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、修改密碼   該密碼被標記為過期了，如果想正常使用還需要修改密碼 mysql> show databases;ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.   以前的 password()函數將會被拋棄，官方建議使用下面的命令來修改密碼 mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';   同時，如果你設置的密碼過于簡單也會報錯。 mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123';ERROR 1819 (HY000): Your password does not satisfy the current policy requirements