I've been using carina for the past 2 months more or less. I've recently encountered the following error while trying to run any docker command on a cluster I've been using without problem until early this week:
"Cannot connect to the Docker daemon. Is the docker daemon running on this host?"
So, I've already checked the entry in the troubleshooting but noup. Since you mentioned in the forum that whenever we find this error again we could dm you, I wanted to ask if you had another suggestion.
By the way, the cluster seems to be running (according to the status in the page when I log in). Hence I wouldn't like to go for the destroy/recreate-cluster solution because I have some data I'd not like to loose. I know carina is a beta service but backups as you know might not be always really "up-to-date". The cluster is called odoo and is running on a different account I have under the email firstname.lastname@example.org. Let me know if you need more details.