appnode面板因需要5.5切换到5.6后点击部署，提示：服务器内部错误:创建用户失败!
鼠标移到提示右上角表符号现实类似：
ERROR 1558 (HY000): Column count of mysql.user is wrong. Expected **, found**. Created with MySQL *****, now running *****. Please use mysql_upgrade to fix this error.出现这个错误主要是因为升级了数据库没有使用过，登录ssh终端使用如下命令即可：
mysql_upgrade -u root -p输入mysql root密码，输出类似：
[root@VM-0-10-centos ~]# mysql_upgrade -u root -p
Enter password:
Looking for 'mysql' as: mysql
Looking for 'mysqlcheck' as: mysqlcheck
Running 'mysqlcheck with default connection arguments
Warning: Using a password on the command line interface can be insecure.
Running 'mysqlcheck with default connection arguments
Warning: Using a password on the command line interface can be insecure.
mysql.columns_priv OK
mysql.db OK
mysql.event OK
mysql.func OK
mysql.general_log OK
mysql.help_category OK
mysql.help_keyword OK
mysql.help_relation OK
mysql.help_topic OK
mysql.host OK
mysql.ndb_binlog_index OK
mysql.plugin OK
mysql.proc OK
mysql.procs_priv OK
mysql.proxies_priv OK
mysql.servers OK
mysql.slow_log OK
mysql.tables_priv OK
mysql.time_zone OK
mysql.time_zone_leap_second OK
mysql.time_zone_name OK
mysql.time_zone_transition OK
mysql.time_zone_transition_type OK
mysql.user OK
Running 'mysql_fix_privilege_tables'...
Warning: Using a password on the command line interface can be insecure.
Running 'mysqlcheck with default connection arguments
Warning: Using a password on the command line interface can be insecure.
Running 'mysqlcheck with default connection arguments
Warning: Using a password on the command line interface can be insecure.
OK再次部署无错误出现。
