Where to see the logs for a failed deployment on managed Vms on Google App Engine?

Question

The deployment fails on google app engine when I try to deploy my app on managed VMs. I suspect it's because appengine doesn't manage to run my container because it has an error. However, I can't check the docker logs since the container failed to run. Locally it works because it has a different config than in production. I suspect that in production my app doesn't resolve the db server ip in the local network but I don't have any logs to investigate.

Answer 1

Go to your Google Developer Console - Compute - VM Instances. SSH into the instance you would like to inspect.

When in web SSH console, see logs in the /var/log/app_engine/app/. I found our java app errors in the /var/log/app_engine/app/STDOUT.yyyy_mm_dd.log.

Answer 2

If your instance fails to come up there should also be a crash.log in the developer console:

https://console.developers.google.com/project/[yourproject]/logs

There should be a dropdown saying Request. If you click it you should be able to see crash.log and syslog and some others. There you can often find a hint of the underlying problem.

However, in my own project that dropdown is broken since yesterday, so I'm not sure if it will work for you. We're currently waiting for Google to fix that.