Adding multiple search domains to network connection with nmcli

This is for my own reference. These days for my lab infrastructure, I automate nearly everything with Ansible. Today I added another dns domain which I will be migrating to eventually and needed to add an additional dns domain to my resolver on this host which is managed by NetworkManager.

Since RHEL8, I became accustomed to managing all network connections in the OS with nmcli and this time I just needed to add an additional search domain (lab.acanorex.io) to the local resolver to go from this:

# resolv.conf
search voltron.xyz
nameserver 172.25.49.253
nameserver 172.25.49.254

To this:

# resolv.conf
search voltron.xyz lab.acanorex.io
nameserver 172.25.49.253
nameserver 172.25.49.254

There is actually an option to configure NetworkManager not to update /etc/resolv.conf by using the NetworkManager option dns=none as per this KCS article: https://access.redhat.com/solutions/894753 but in true vanilla boy Red Hat fashion, I let NetworkManager take control of it, so if I were to edit resolv.conf file manually, the changes would have been lost after a reboot.

This is how you add multiple dns search domains using nmcli:

nmcli con mod <id> ipv4.dns-search "x.x.x.x,y.y.y.y"

This is the actual example that I used in my setup:

# Current settings
(openstack-tools) [burbles@utility ~]$ nmcli con show enp1s0 | grep ipv4.dns-search
ipv4.dns-search:                        voltron.xyz

# Command to change it
(openstack-tools) [burbles@utility ~]$ sudo nmcli con mod enp1s0 \
ipv4.dns-search "voltron.xyz,lab.acanorex.io"

# Verification of changes
(openstack-tools) [burbles@utility ~]$ nmcli con show enp1s0 | grep ipv4.dns-search
ipv4.dns-search:                        voltron.xyz,lab.acanorex.io

# Reload the connection after changes
(openstack-tools) [burbles@utility ~]$ sudo nmcli con reload

A short and sweet reference for later.