1

Using a lot of CentOS 7 hosts on a very small subnet. I use only a small portion of the hosts at each time. The other portion of the hosts are powered off. However, occasionally the powered off hosts are booted accidentally and cause a duplicate IP situation.

Considering that I can't change the working procedure, I want to disable the networking completely on the powered off hosts if they are accidentally booted. I can change the /etc/sysconfig/network-scripts for each interface, but the names of interfaces vary between hosts and the number of interfaces is ~6 for each host.

So, how do I disable all networking?

Improve this question

1 Answer 1

Reset to default
2

I tried following on few VM's. It's probably overkill but you might try it.

for i in network.target network-online.target NetworkManager.service NetworkManager-wait-online.service network.service; do systemctl disable $i systemctl mask $i done

After it VM's started without networking. Some notes:

  • Masked units must be unmasked before used.
  • I tried this only on CentOS 7 vms (libvirt && virtualbox vagrant images).
  • In the old days you could just set runlevel to multi-user (2, one without networking :)), but systemd (according to my knowledge) don't have a similar target (runlevel).

Edit:

As mentioned @GAD3R - NetworkManager-wait-online.service now is included

Improve this answer
1
  • 1
    Fixed. I don't know If I could mention your profile in answer the @ in comments works, but not for answers :(. Commented Jan 19, 2021 at 12:12

You must log in to answer this question.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.