Nomad does not download latest docker image

[John Wong]

Here is my hello world hcl file: https://gist.github.com/yeukhon/5412eeec74000455060094ccf50970cf

task "hello-task" {
	driver = "docker"
	config {
	image = "registry/username/helloworld/0.1:latest"
	port_map {
	http = 8000
	}
	}

I changed the response from hello world to bye world as a test. But it seems like Nomad would not download the newer latest docker image I have published even though my registry has a modified latest image available. I can force it to use another version of course if I change the tag. Thoughts? I am running Nomad v0.8.4

I understand it's possible Nomad caches docker image locally, but the sha checksum is different, so why wouldn't Nomad pull the latest? Thank you.

[Edson Yamada]

This is strictly connected to docker's behavior.

If you a run a "docker run my-container:latest" and you already have a mycontainer-latest image locally, docker won't check whether there's a newer version or not of mycontainer-latest -- it will simply run the local image. It's up to you to explicity run  "docker pull" before if you want to ensure the image is up to date. 

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[Matt Veitas]

See the force_pull option for the docker driver: https://www.nomadproject.io/docs/drivers/docker.html#force_pull

-Matt