沒有wget，先安裝wget

yum -y install wget

下載和安裝mysql源

wget http://dev.mysql.com/get/mysql57-community-release-el7-7.noarch.rpm
yum localinstall -y mysql57-community-release-el7-7.noarch.rpm

線上安裝mysql-community-server

yum install -y mysql-community-server

啟動mysql

systemctl start mysqld

設定開機啟動

systemctl enable mysqld
systemctl daemon-reload
 

檢視密碼

cat /var/log/mysqld.log | grep password

進入資料庫登陸介面，輸入剛剛查到的密碼，進行資料庫的登陸，複製貼上就行

mysql -uroot -p 

mysql> use mysql
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

以上錯誤表示密碼需要重置

mysql> alter user 'root'@'localhost' identified by '123456';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
 

以上錯誤與validate_password_policy的值有關，接著修改這個值

mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)

mysql> set global validate_password_length=1;
Query OK, 0 rows affected (0.00 sec)

完成之後再修改密碼就OK了

mysql> alter user 'root'@'localhost' identified by '123456';
Query OK, 0 rows affected (0.00 sec)