【mysql】centos7安装mysql5.7（配置文件取消默认密码）

1.下载mysql源安装包

wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm;

2.添加源

yum localinstall mysql57-community-release-el7-8.noarch.rpm;

3.检查mysql源 是否添加成功

yum repolist enabled | grep "mysql.*-community.*";

4.安装mysql

yum install mysql-community-server;

默认会安装4个包：
1.mysql-community-server;
2.mysql-community-client;
3.mysql-community-common;
4.mysql-community-libs;

5.检查是否安装成功

mysql -V;

6.守护进程

systemctl start mysqld    #启动mysql
systemctl restart mysqld    #重启mysql
systemctl stop mysqld    #停止mysql
systemctl enable mysqld    #开机启动
systemctl daemon-reload    #重载守护进程

7.取消默认密码

// 编辑mysql配置文件
vim /etc/my.cnf;
// 在 [mysqld] 小节下添加一行：
skip-grant-tables=1;
// 重启mysql
systemctl restart mysqld;

8.修改密码

// 上一步操作取消了默认密码，现在可以直接登录。登录之后重新设置密码为root
update user set authentication_string = password('root'), password_expired = 'N', password_last_changed = now() where user = 'root';

9.远程链接设置

// 通常会有在本地navicat连接远程数据库的需求。在mysql数据库中执行
update user set host = '%' where user = 'root';    #允许所有ip连接
FLUSH PRIVILEGES;    #刷新