Whack a VM Swap Playbook: Swapped VM Loses Network Connectivity

[kayiwa]

Expected behavior

The playbook designed to swap a virtual machine (VM) successfully completes all tasks without errors. However, after the swap is performed, the new VM is unable to establish network connectivity. This prevents any external communication with the server, making it inaccessible.

Actual behavior

Error messages

Include any error messages from STDOUT, STDERR, log files, etc., that you did not include under 'Actual behavior' above.

Steps to replicate

Prepare Environment:

1. Have a running VM (VM-A) with a working network connection.
2. run playbook and wait for replacement VM (VM-A-new) with a working network connection.

Expected Behavior:

The VM swap playbook should result in a fully functional VM (VM-A-new) that has network connectivity. I should be able to connect to the VM via SSH, ping, and other network services as configured.

Actual Behavior:

The playbook reports success, but the swapped VM (VM-B) has no network connectivity. Attempts to connect via SSH, ping, or other protocols fail. The VM is essentially isolated from the network.

Impact of this bug

Ops have to manually log in at the console

and run

sudo dhclient -v

then create this systemd unit file

[Unit]
Description=DHCP Client for %i
After=network.target

[Service]
ExecStart=/sbin/dhclient -v %i
Restart=always

[Install]
WantedBy=multi-user.target

Relevant links and code snippets, if applicable

Implementation notes, if any

[kayiwa]

the Rocky Template was using RHEL 8 instead of CentOS 8

[kayiwa]

we still fail at the same spot requiring manual intervention. Results of journalctl -b | grep -i network specifically show.

Jan 14 11:28:43 nomad-client-prod4 NetworkManager[817]: <warn>  [1736875723.1576] ifcfg-rh: ifcfg,/etc/sysconfig/network-scripts/ifcfg-ens192:11: invalid line ignored
Jan 14 11:28:43 nomad-client-prod4 NetworkManager[817]: <warn>  [1736875723.1576] ifcfg-rh: ifcfg,/etc/sysconfig/network-scripts/ifcfg-ens192:12: invalid line ignored
Jan 14 11:28:43 nomad-client-prod4 NetworkManager[817]: <warn>  [1736875723.1576] ifcfg-rh: ifcfg,/etc/sysconfig/network-scripts/ifcfg-ens192:13: invalid line ignored

It seems like we will need to use keyfiles instead