Good morning Ales,

Thank you for your response.

At this point, while I believe I have marked the networks as required, I am hesitant to assume that they are marked because I don't understand for sure which pieces I don't understand. 

Unfortunately, what I am missing is a number of random bits and pieces that tie everything together. 

I have fought with the networking on this cluster for over a week. The network configuration was so messed up it was faster and cleaner to wipe the cluster completely and start from scratch, and I just finished a clean reinstallation. 

Now that it's back up and I understand it better, the VM's on VLAN's are still unable to reach beyond themselves - they cannot even ping the host they are on.

Rather than try to address it symptom by symptom, I would like to get a solid overview of how the different pieces tie together. Unfortunately, in the official documentation, all I found was which buttons to push to edit the vlan, with nothing that addresses how the different pieces are wired together.

My understanding of the architecture is:

VM -> vNIC -> virtual switch -> physical NIC -> external network -> gateway -> internet

What I don't understand is how to determine at which point in the architecture the configuration is wrong, when the only symptom I have for sure right now is that my VM's on a VLAN won't ping the host or anything on the external network.

At one point everything was working as expected, briefly, before the whole thing came crashing down, so the external network is at least mostly configured.

On Tue, Feb 2, 2021, 12:20 AM Ales Musil <amusil@redhat.com> wrote:


On Tue, Feb 2, 2021 at 6:18 AM David Johnson <djohnson@maxistechnology.com> wrote:
Good morning all,

On my ovirt 4.4.4 cluster, I am trying to use VLan's to separate VM's for security purposes.

Is there a usable how-to document that describes how to configure the vlan's so they actually function without taking the host into non-operational mode?

Thank you in advance.

Regards,
David Johnson

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Hello,

I assume that you have marked those networks as required. This is handy to make sure that all hosts in a cluster have this network attached.
Which implies that the host is considered non operational until you assign all required networks.

To avoid this you can uncheck it for a new network in the cluster tab of the "New Logical Network" window. For existing go to
Compute -> Clusters -> $YOUR_CLUSTER -> Logical Networks -> Manage Networks and uncheck required for the affected network.
This can be always changed back.

Hopefully this helps.
Regards,
Ales




--

Ales Musil

Software Engineer - RHV Network

Red Hat EMEA

amusil@redhat.com    IM: amusil