變更 root 密碼

1. 使用 mysqladmin 變更 root 密碼。
   

   [root@kvm6 ~]# mysqladmin -uroot -p123qwe password 'qweqwe'
   

2. 變更後，以新密碼 qweqwe 成功登入。
   

   [root@kvm6 ~]# mysql -uroot -pqweqwe
   Welcome to the MySQL monitor.  Commands end with ; or \g.
   Your MySQL connection id is 3745
   Server version: 5.5.49 MySQL Community Server (GPL) by Remi
   
   Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
   
   Oracle is a registered trademark of Oracle Corporation and/or its
   affiliates. Other names may be trademarks of their respective
   owners.
   
   Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
   
   mysql>