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I am using CentOS 6.7.
What's the purpose of /etc/sysconfig/network file?
I have found that the first thing /etc/init.d/network does is checking if that file exists and exit if it is not founded.
My CentOS 6.7 didn't have that file by default. Why?
The only thing you really need it for is setting the hostname. Otherwise, you can add some network and gateway settings, but you can just as easily put that stuff in the /etc/sysconfig/network-scripts/ifcfg-ethX files.
ONBOOT=yes, but it doesn't work. – Yishu Fang Sep 17 '15 at 15:25