Rancher nodes not staying up after upgrade

I have just upgraded to Rancher 1.6.7 running on RHEL7.4 and my nodes will not stay up. We are pre-seeding all our docker images into the AMI as we are in an airgapped environment. The version numbers for all the containers we’ve been given does not list lb-service-haproxy. However on the release notes (https://github.com/rancher/rancher/releases/tag/v1.6.7) I can see that this should be v0.7.6

The global-lb and healthcheck containers don’t seem to be able to stay up. I’m not seeing any logs from these containers.

Any suggestions as to how I should diagnose this? I’m fairly new to Rancher.

Is there anything relevant in the logs of the rancher-agent container?

We solved this in the end by upgrading to Rancher 1.6.8 because 1.6.7 is not supported on RHEL 7.4 and in fact breaks many of the network stacks.