1、开发人员说服务器ping不通外网
[root@cs2 ~]# ping
ping: unknown host
2、经排查,在配置文件中加了个dns
[root@cs2 ~]# grep hosts /etc/nsswitch.conf
#hosts: db files nisplus nis dns
hosts: files dns
3、可以ping通
[root@cs2 ~]# ping
PING (220.181.111.188) 56(84) bytes of data.
64 bytes from 220.181.111.188: icmp_seq=1 ttl=57 time=8.61 ms
64 bytes from 220.181.111.188: icmp_seq=2 ttl=57 time=3.49 ms
参考文章:http://blog.csdn.net/xionglang7/article/details/7341653
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