mysql ERROR 1193 1064 1290 1558 2002错误如何解决？

mysql> set global validate_password_policy=0;
ERROR 1193 (HY000): Unknown system variable ‘validate_password_policy’

mysql> alter user ‘root’@‘localhost’ identifed by ‘root’;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘identifed by ‘root’’ at line 1

mysql> set password = password(‘root’);
ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement

ERROR 1558 (HY000): Column count of mysql.proc is wrong. Expected 20, found 16. Create
解决办法:
使用命令：mysql_upgrade -u[username] -p[password]就可以解决

ERROR 2002 (HY000): Cant connect to local MySQL server through socket的
解决方法：
lsof -i:3306
或service mysqld status