Configure DNSMode using Network-Config-Manager

nmctl (network-config-manager) is a open source networking tool from vmware to configure and setup the network to the system, It has bunch of options to configure anything like virtual devices, link configuration, network configuration etc. nmctl can be installed in PhotonOS using tdnf command for more details please visit the README.

This article is focused on configuring various DNSMode using nmctl tool.Here are the example's to setup different kind of DNSMode and verify them that is configured correctly or not. Please check the below snippet of executed commands.

# tdnf install -y network-config-manager

Installing:
libedit                                 x86_64                        3.1.20221030-2.ph5                      photon-updates                243.83k                         116.75k
nftables                                x86_64                        1.0.6-1.ph5                             photon-updates                954.72k                         342.90k
json-c                                  x86_64                        0.16-1.ph5                              photon-updates                 72.99k                          38.11k
network-config-manager                  x86_64                        0.6.5-1.ph5                             photon-updates                978.60k                         242.62k

Total installed size:   2.20M
Total download size: 740.38k
libedit                                 119552 100%
nftables                                351133 100%
json-c                                   39021 100%
network-config-manager                  248446 100%
Testing transaction
Running transaction
Installing/Updating: json-c-0.16-1.ph5.x86_64
Installing/Updating: libedit-3.1.20221030-2.ph5.x86_64
Installing/Updating: nftables-1.0.6-1.ph5.x86_64
Created symlink /etc/systemd/system/multi-user.target.wants/nftables.service → /usr/lib/systemd/system/nftables.service.
Installing/Updating: network-config-manager-0.6.5-1.ph5.x86_64        

• Setup DNSMode merged

root@photon-ncm: ~:#nmctl set-dhcp dev test99 dhcp yes
root@photon-ncm: ~:#nmctl add-dns dev test99 dns 192.168.1.45 192.168.1.46

root@photon-ncm: ~:#nmctl sdm dev test99
DNS Mode: merged
root@photon-ncm: ~:#nmctl sdm dev test99 -j
{
  "DNSMode": "merged"
}        

• Setup DNSMode dhcp

root@photon-ncm: ~:#nmctl set-dhcp dev test99 dhcp yes

root@photon-ncm: ~:#nmctl sdm dev test99
DNS Mode: DHCP
root@photon-ncm: ~:#nmctl sdm dev test99 -j
{
  "DNSMode": "DHCP"
}        

• Setup DNSMode static

root@photon-ncm: ~:#nmctl set-dhcp dev test99 dhcp no
root@photon-ncm: ~:#nmctl add-dns dev test99 dns 192.168.1.45 192.168.1.46

root@photon-ncm: ~:#nmctl sdm dev test99
DNS Mode: static
root@photon-ncm: ~:#nmctl sdm dev test99 -j
{
  "DNSMode": "static"
}        

• Setup DNSMode static with UseDNS no

root@photon-ncm: ~:#nmctl set-dhcp dev test99 dhcp yes
root@photon-ncm: ~:#nmctl set-dhcp4 dev test99 use-dns no
root@photon-ncm: ~:#nmctl set-dhcp6 dev test99 use-dns no
root@photon-ncm: ~:#nmctl add-dns dev test99 dns 192.168.1.45 192.168.1.46

root@photon-ncm: ~:#nmctl sdm dev test99
DNS Mode: static
root@photon-ncm: ~:#nmctl sdm dev test99 -j
{
  "DNSMode": "static"
}        

• Setup DNSMode merged with UseDNS yes

root@photon-ncm: ~:#nmctl set-dhcp dev test99 dhcp yes
root@photon-ncm: ~:#nmctl set-dhcp4 dev test99 use-dns yes
root@photon-ncm: ~:#nmctl set-dhcp6 dev test99 use-dns yes
root@photon-ncm: ~:#nmctl add-dns dev test99 dns 192.168.1.45 192.168.1.46

root@photon-ncm: ~:#nmctl sdm dev test99
DNS Mode: merged
root@photon-ncm: ~:#nmctl sdm dev test99 -j
{
  "DNSMode": "merged"
}