I was playing around with Docker locally and somehow ended up with this error when I tried to list my docker machines:

My Google Fu was weak I couldn’t find any suggestions for what this might mean so I tried shutting it down and starting it again! </>

On the restart I actually got some helpful advice: _~bash $ docker-machine stop Stopping "default"... Machine "default" was stopped. _{~ ~}bash $ docker-machine start Starting "default"... (default) Check network to re-create if needed... (default) Waiting for an IP... Machine "default" was started. Waiting for SSH to be available... Detecting the provisioner... Started machines may have new IP addresses. You may need to re-run the docker-machine env command. _~

So I tried that: _~bash $ docker-machine env Error checking TLS connection: Error checking and/or regenerating the certs: There was an error validating certificates for host "192.168.99.101:2376": x509: certificate is valid for 192.168.99.100, not 192.168.99.101 You can attempt to regenerate them using 'docker-machine regenerate-certs [name]'. Be advised that this will trigger a Docker daemon restart which will stop running containers. _~

And then regenerates my certificates: _~bash $ docker-machine regenerate-certs Regenerate TLS machine certs? Warning: this is irreversible. (y/n): y Regenerating TLS certificates Waiting for SSH to be available... Detecting the provisioner... Copying certs to the local machine directory... Copying certs to the remote machine... Setting Docker configuration on the remote daemon... _~

And now everything is happy again! _~bash $ docker-machine ls NAME ACTIVE DRIVER STATE URL SWARM DOCKER ERRORS default - virtualbox Running tcp://192.168.99.101:2376 v1.9.0 _~