[root@ora102 ~]# mysql -uroot -pchinabidding -h292.168.8.247

Warning: Using a password on the command line interface can be insecure.

排查问题：

1）网络是通的

ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.8.247' (113)

[root@ora102 ~]# ping 192.168.8.247

PING 192.168.8.247 (192.168.8.247) 56(84) bytes of data.

64 bytes from 192.168.8.247: icmp_seq=1 ttl=64 time=0.510 ms

64 bytes from 192.168.8.247: icmp_seq=2 ttl=64 time=0.446 ms

64 bytes from 192.168.8.247: icmp_seq=3 ttl=64 time=0.475 ms

2）权限是没问题的

MySQL [(none)]> select host,user,password from mysql.user;

+-----------+------+-------------------------------------------+

| host | user | password |

+-----------+------+-------------------------------------------+

| localhost | root | *2548EFB13B516547C44482A519B886726A3B8E42 |

|%| root | *2548EFB13B516547C44482A519B886726A3B8E42 |

| 127.0.0.1 | root | *2548EFB13B516547C44482A519B886726A3B8E42 |

| ::1| root | *2548EFB13B516547C44482A519B886726A3B8E42 |

3）vi /etc/my.cnfi 查看参数bind-address 是否设置成了 = 127.0.0.1

我压根没有设置这个参数，这个参数是默认是127.0.0.1，限制只能本地登录。

4）查看防火墙状态，如下，active的，防火墙的是开的。

bogon:root@~>service iptables status

Redirecting to /bin/systemctl status iptables.service

● iptables.service - IPv4 firewall with iptables

Loaded: loaded (/usr/lib/systemd/system/iptables.service; disabled; vendor preset: disabled)

Active: active (exited)since Wed 2017-12-06 15:01:37 CST; 2s ago

Process: 21617 ExecStop=/usr/libexec/iptables/iptables.init stop (code=exited, status=0/SUCCESS)

Process: 22369 ExecStart=/usr/libexec/iptables/iptables.init start (code=exited, status=0/SUCCESS)

Main PID: 22369 (code=exited, status=0/SUCCESS)

Dec 06 15:01:37 bogon systemd[1]: Starting IPv4 firewall with iptables...

Dec 06 15:01:37 bogon iptables.init[22369]: iptables: Applying firewall rules: [ OK ]

Dec 06 15:01:37 bogon systemd[1]: Started IPv4 firewall with iptables.

查看端口，然后尝试去远端telnet 这个端口是否是同的。

MySQL [(none)]> show global variables like 'port';

+---------------+-------+

| Variable_name | Value |

+---------------+-------+

| port | 3306 |

+---------------+-------+

1 row in set (0.00 sec)

telne果然是不通的

[root@ora102 ~]# telnet 192.168.8.247 3306

Trying 192.168.8.247...

telnet: connect to address 192.168.8.247: No route to host

在源段关闭防火墙：

bogon:root@~>service iptables stop

Redirecting to /bin/systemctl stop iptables.service

永久关闭：

bogon:root@~>chkconfig iptables on

再次在远程登陆，正常了。。。。

[root@ora102 ~]# mysql -uroot -pchinabidding -h292.168.8.247

Warning: Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 21

Server version: 5.5.29-log Source distribution

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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.

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