centos7 安装mysql

1.查看系统中是否已安装 MySQL 服务

#rpm -qa | grep mysql#yum list installed | grep mysql

如果已经有安装的，用命令删掉

#yum -y remove ...

2.下载安装

#wget http://repo.mysql.com/mysql57-community-release-el7-9.noarch.rpm  //下载#rpm -ivh mysql57-community-release-el7-9.noarch.rpm#yum install mysql-server  //一路选y,直到安装完成

3.配置

安装完毕后，在 /var/log/mysqld.log 文件中会自动生成一个随机的密码，需要先取得这个随机密码

#grep "password" /var/log/mysqld.log2017-08-06T04:23:22.939636Z 1 [Note] A temporary password is generated for root@localhost: aZqHg=eQG9Nq

使用临时密码登陆mysql并更新用户 root 的密码

#[root@iZjafzbmqur2lzZ ~]# mysql -u root -paZqHg=eQG9Nqmysql: [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 5Server version: 5.7.19Copyright (c) 2000, 2017, 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> 

打印以上信息表示登陆成功，设置用户 root 可以在任意 IP 下被访问：

mysql> set password = password('新密码');mysql> grant all privileges on *.* to root@"%" identified by "新密码";  //设置用户 root 可以在任意 IP 下被访问mysql> grant all privileges on *.* to root@"localhost" identified by "新密码";mysql> show databases;  //查看当前都内置了哪些数据库+--------------------+| Database           |+--------------------+| information_schema || mysql              || performance_schema || sys                |+--------------------+4 rows in set (0.00 sec)mysql> exit  //退出

4. 启动

#service mysqld start     //启动 MySQL 服务#service mysqld restart   //重启 MySQL #ervice mysqld status     //查看 MySQL 的状态

5. 忘记密码时，可用如下方法重置：

#service mysqld stop# mysqld_safe --user=root --skip-grant-tables --skip-networking &# mysql -u root mysql> use mysql;mysql> update user set password=password("new_password") where user="root"; mysql> flush privileges;