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Other interfaces not getting IP address

asked 2017-01-16 23:10:44 -0500

DarkKnight gravatar image

updated 2017-04-27 02:12:22 -0500

I am trying to create an instance from an RHEL image. The RHEL image had one network interface. Now when i launch an instance using this image and attach the instance to more than one networks(3 actually in my case), what i notice is that although an "ip a " lists me three network interfaces, but the other two interface dont get an IP address. When i digged down, i found out that "ifcfg-eth1" and "ifcfg-eth2" files under the /etc/sysconfig/network-scripts/ directory were missing. Upon simply adding and restarting the network these two nw interfaces got the IP as well.

So i wanted to know from other people experience that how do they handle such a scenario? Also, i just cannot go ahead and create ifcfg-files because i am not sure as to what will be the interface name. It could be eth or enps or em.

Kindly suggest solutions on RHEL6 and RHEL7.

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answered 2017-01-19 06:28:10 -0500

Moorthy gravatar image

updated 2017-01-19 06:48:23 -0500

You can try 'userdata' option of nova create along with cloud-config file to configure the second and third interface on boot.

Also all the interfaces will be named eth* as they are VMs.

Another option is to create a new image from the already configured instance (with 3 interfaces) and use it for future instances.

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answered 2017-01-19 09:49:56 -0500

dbaxps gravatar image

Check Guestfish on RHEL7.qcow2 ( it does work on CentOS 7 cloud images )
with ifcfg-eth(X)

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answered 2017-02-03 21:57:07 -0500

DarkKnight gravatar image

updated 2017-04-27 02:12:47 -0500

I am posting what i did so that it may be helpful for others who encoounter the same issue. on the image that i used, i enabled networkmanager as a service to start on boot time. I also deleted all the ifcfg-eth* files from my image. Now when i spawn instances using the image, all interfaces comes up with ip address assigned

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Asked: 2017-01-16 23:10:44 -0500

Seen: 909 times

Last updated: Apr 27 '17