DNS contextualization is not working with Rocky Linux 9

Community Support
1

I downloaded the Rocky Linux 9 image provided by OpenNebula and created a VM. I have set all network related parameters in the network config. The IP address, netmask etc are all correctly taken over and added to the VM but only ETH0_DNS is not used. After every reboot of the VM looses the DNS config.

Does anybody know why this happens?

2

Are you issuing reboots from within the VM or from OpenNebula ? You might be able to find clues as why is this the case on the one-context systemd unit reports or at /var/log/messages.

3

I usually reboot from within the VM. The systemd logs were already rotated. The file /var/log/messages didn’t help much. I see that NetworkManager applied the other things:

NetworkManager[957]: <info>  [1702595445.9596] audit: op="connection-update" uuid="cfde59e1-cbc6-4de7-a33b-a5d007e505a9" name="eth0" args="ipv4.addresses,ipv4.method" pid=1233 uid=0 result="success"
NetworkManager[957]: <info>  [1702595445.9891] audit: op="connection-update" uuid="cfde59e1-cbc6-4de7-a33b-a5d007e505a9" name="eth0" args="ipv4.gateway" pid=1237 uid=0 result="success"

Later I see as well that these values are set as default:

NetworkManager[957]: <info> [1702595447.3171] policy: set 'eth0' (eth0) as default for IPv4 routing and DNS

But nowhere is mentioned what happened with the DNS config value. For the “OpenNebula pre-networking contextualization” I see all values that were read in and set e.g.:

one-contextd[795]: kernel.kptr_restrict = 1
one-contextd[795]: net.ipv4.conf.default.rp_filter = 1
one-contextd[795]: net.ipv4.conf.eth0.rp_filter = 1
one-contextd[795]: net.ipv4.conf.lo.rp_filter = 1
one-contextd[948]: Done

but not for the networking part itself.

4

Can you show the VM instance template onevm show -j <vm_id> ?