Ran into this issue today fooling around with Docker and Managed VMs on Google Cloud Platform. I was running on Mac OS X, which meant boot2docker was also in the mix. Figured this could help someone else because it baffled me for a bit.
I was trying to start up a standard runtime for python on Managed VM. I was using the following app.yaml:
module: default runtime: python27 vm: true api_version: 1 threadsafe: yes resources: cpu: .5 memory_gb: 1.3 manual_scaling: instances: 1 handlers: - url: .* script: main.app
I ran the gcloud command:
gcloud preview app run ./app.yaml
In the midst of the output, this error was buried:
ERROR 2015-05-22 17:21:59,043 containers.py:283] v1 ping attempt failed with error: Get https://gcr.io/v1/_ping: dial tcp: i/o timeout. If this private registry supports only HTTP or HTTPS with an unknown CA certificate, please add `--insecure-registry gcr.io` to the daemon's arguments. In the case of HTTPS, if you have access to the registry's CA certificate, no need for the flag; simply place the CA certificate at /etc/docker/certs.d/gcr.io/ca.crt
What was really frustrating is that this had worked yesterday and I had changed nothing in between. I tried a whole bunch of things. I fired a whole lot of searches on Google. In my searches I found this thread on github that suggests it’s an issue with some sort of caching in Docker. So I did the following:
- Launched Virtual Box
- Right clicked boot2docker-vm
- Chose Close ->Power Off
- Launched boot2docker again via Applications->boot2docker
- Tried again
And now it works.
Hope this helps someone else.