General
This page provides general administrative help and troubleshooting tips.
Docker
Host resolution errors
Sometimes Docker can have seemingly mysterious network issues, where you might see errors like this in the logs:
With a multi-node cluster, sometimes the overlay network can start having issues and needs to be recreated for that service. This can be done, by removing the service (or stack) and then redeploying it.
For example, to redeploy just proxysolr (since we don't want to remove
the whole Solr stack):
But if it was the Monitoring application having issues, we'd be ok temporarily removing all those services and could just do this:
Upgrade errors
If you find you're having issues with a newer version of docker.io,
(like we did with 28.2.2) you can revert it to your last working version,
found in /var/log/apt/history.log using:
# 27.5.1-0ubuntu3~22.04.2 was the version
# from /var/log/apt/history.log that was running previously
sudo apt install docker.io=27.5.1-0ubuntu3~22.04.2
sudo apt-mark hold docker.io
You can also review the release notes
to identify if there are known issues in the release that are fixed in newer releases,
so you can safely remove the apt-mark hold.