异常
在测试环境新搭建的MySQL服务端，启动后登陆MySQL如下异常：
[root@test177 ~]# mysql -u root -po2jSLWw0ni -h test177
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 1130 (HY000): Host 'test177' is not allowed to connect to this MySQL server
由于不能改变hostname，所以只能通过跳过数据库权限验证，来修改权限。
首先停止MySQL服务端
systemctl stop mysqld
在/etc/my.cnf中的[mysqld]选项中添加跳过验证策略skip-grant-tables，my.cnf文件内容如下：
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
skip-grant-tables
然后重新启动MySQL服务：
systemctl start mysqld
登陆数据库，通过以下两种方法修改权限：
通过表修改
use mysql;
update user set host = '%' where user = 'root' and host='localhost';
select host, user from user;
通过授权
GRANT ALL PRIVILEGES ON *.* TO 'account_name'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;
FLUSH PRIVILEGES;
