【mysql】centos7安裝mysql5.7（配置文件取消默認密碼）

1.下載mysql源安裝包

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.檢查mysql源 是否添加成功

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

4.安裝mysql

yum install mysql-community-server;

默認會安裝4個包：
1.mysql-community-server;
2.mysql-community-client;
3.mysql-community-common;
4.mysql-community-libs;

5.檢查是否安裝成功

mysql -V;

6.守護進程

systemctl start mysqld    #啟動mysql
systemctl restart mysqld    #重啟mysql
systemctl stop mysqld    #停止mysql
systemctl enable mysqld    #開機啟動
systemctl daemon-reload    #重載守護進程

7.取消默認密碼

// 編輯mysql配置文件
vim /etc/my.cnf;
// 在 [mysqld] 小節下添加一行：
skip-grant-tables=1;
// 重啟mysql
systemctl restart mysqld;

8.修改密碼

// 上一步操作取消了默認密碼，現在可以直接登錄。登錄之后重新設置密碼為root
update user set authentication_string = password('root'), password_expired = 'N', password_last_changed = now() where user = 'root';

9.遠程鏈接設置

// 通常會有在本地navicat連接遠程數據庫的需求。在mysql數據庫中執行
update user set host = '%' where user = 'root';    #允許所有ip連接
FLUSH PRIVILEGES;    #刷新