Linux 系統 ：CentOS7.X版本下安裝MySQL5.7資料庫
設定rpm下載目錄在/opt目錄下新建一個目錄存放mysql
cd /opt sudo mkdir mysql12
下載MySQL的源
如果在這之前沒有提示-bash: wget: command not found，那麼還得先安裝wget
sudo yum install wget1
安裝MySQL的rpm
sudo rpm -ivh mysql57-community-release-el7-8.noarch.rpm1
安裝MySQL
sudo yum install mysql-server1
在這步中只需要一直y然後回車就行，資料庫就安裝好了，現在進行連線：
mysql -uroot -p root ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)123
這是/var/lib/mysql許可權問題，修改MySQL許可權為當前使用者
sudo chown -R xxx:xxx /var/lib/mysql1
xxx為當前的使用者名稱以及所屬組 重啟MySQL服務
service mysqld restart1
密碼輸入root即可 如果還不行的話通過這個命令獲得初始密碼
cat /var/log/mysqld.log | grep password1
其中A temporary password is generated for [email protected]: bGlY?13TtFyX–：後面的就是初始密碼；登陸進去之後先不做其他操作，作如下操作：
set global validate_password_policy=0; set global validate_password_length=4;12
設定密碼
alter user ‘root’@‘localhost’ identified by ‘root’;1
自此CentOS安裝MySQL5.7就完美安裝了
mysql -uroot -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4 Server version: 5.7.20 MySQL Community Server (GPL)
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