CentOS 7 minimal doesn’t get an IP address from DHCP on startup

Question

I had install CentOS 7 minimal. The interface eno1677736 is up without an IP address when the OS starts up.

I restart the interface and it can obtain IP from DHCP server if I run this command:

ifdown eno1677736; ifup eno1677736

But if I reboot the OS, interface will lose the IP address.

My question is how to make the interface have an IP address automatically?

I tried configuring DHCP client as explained here.

Solution

Check that ONBOOT is set to yes in /etc/sysconfig/network-scripts/ifcfg-eno1677736.

And a quick fix in case it already is—although not the best one—would be to add ifdown eno1677736; ifup eno1677736 at the bottom of /etc/rc.d/rc.local.

Then save the file and make it executable:

chmod +x /etc/rc.d/rc.local

Now you’ll be running that command on every startup.

Comments

[Dylan Rozendom]

unix.stackexchange.com/questions/59789/… Have you tried it this way?

[qin]

@DylanRz No, that way will use static ip address. But I must use ip from dhcp server.

[Jeter-work]

That interface name does not look right. Why is it so long? Was that auto assigned by centos or manually based on some organizational standard?

[qin]

@Xalorous it's assigned by centos. I just use a VMware Fusion vm.

[Jeter-work]

Oh, ok. I'm still adjusting to the consistent device naming, expecting some other sort of string.

[qin]

Oh, I have double check the ONBOOT before I ask. However I still left it no which I thought as on