Para fazer isso, você precisará identificar sua interface de rede (ie eth0)
# nmcli conn
NAME UUID TYPE DEVICE
eth0 74315f7c-1573-4150-9c0e-e06ad28cac95 802-3-ethernet eth0
#
# nmcli conn edit eth0
===| nmcli interactive connection editor |===
Editing existing '802-3-ethernet' connection: 'eth0'
Type 'help' or '?' for available commands.
Type 'describe [<setting>.<prop>]' for detailed property description.
You may edit the following settings: connection, 802-3-ethernet (ethernet), 802-1x, ipv4, ipv6, dcb
nmcli> print ipv4.dns-search
ipv4.dns-search: mydomain.linux.com
nmcli>
nmcli> set ipv4.dns-search mylinuxdomain.com,anotherdomain.com
nmcli>
nmcli> save permanent
Em seguida, reinicie sua rede. Eu uso o nmcli para fazer isso: 1. Para derrubar
# nmcli conn down eth0
2. Para trazer à tona
# nmcli conn up eth0