docker host volumes

[whitlockjc]

Have you tried using docker run with a host volume? Within the docker container, the container directory is there but the contents are always empty. Here is an example:

$ docker run --rm --name build-dex -v $GOPATH:/go golang:latest ls -l /go
total 0

What I expect is this:

ls -l $GOPATH
total 0
drwxr-xr-x  38 notyou  staff  1292 Aug 10 16:11 bin
drwxr-xr-x   3 notyou  staff   102 Feb  2  2015 pkg
drwxr-xr-x  13 notyou  staff   442 Jul 14 15:13 src

This could be a Docker question but from what I can tell, it should work and I'm using the right syntax. Maybe my system needs a reboot...

[whitlockjc]

I'm an idiot. The issue is that the host is not my OS X box but my CoreOS VM.

[whitlockjc]

Wait, that's not totally true either because the CoreOS VM mounts this. But...I do think I read somewhere that Docker mounts and NFS do not play nicely so it would seem that is the issue. I verified this (to a degree) by mounting a non-NFS directory in the CoreOS VM and it works as expected.

[whitlockjc]

I'm reopening this because I want to get your opinion on installing a Docker Volume Plugin to allow this: http://netshare.containx.io/docs/getting-started

[rimusz]

yes, docker sucks with NFS volumes in our case. never tried that Docker Volume Plugin, I just usually end up doing rsync. @AntonioMeireles what do you think?

[whitlockjc]

I just ran into this again trying to build minikube against a custom build of Kubernetes:

if [ ! -e /Users/notyou/workspaces/personal/minikube/src/k8s.io/minikube/_gopath/src/k8s.io ]; then mkdir -p /Users/notyou/workspaces/personal/minikube/src/k8s.io/minikube/_gopath/src/k8s.io && ln -s -f /Users/notyou/workspaces/personal/minikube/src/k8s.io/minikube /Users/notyou/workspaces/personal/minikube/src/k8s.io/minikube/_gopath/src/k8s.io; fi
docker run -w /go/src/k8s.io/minikube -e IN_DOCKER=1 -v /Users/notyou/workspaces/personal/minikube/src/k8s.io/minikube:/go/src/k8s.io/minikube gcr.io/google_containers/kube-cross:v1.6.2-1 make out/localkube
make: *** No rule to make target 'out/localkube'.  Stop.
make: *** [out/localkube] Error 2

Following the "Updating Kubernetes" section of kubernetes/minikube, when I get to the point where I run make, I get the error above. This is because the approach minkube uses is to build within Docker using host volumes.

[whitlockjc]

By the way, I'm not looking to leave kube-solo for minikube, I am trying to run a local developer build of Kubernetes. If you have a better way to do this...

[rimusz]

@whitlockjc sorry been away for the conference, and too busy this week. the best would be use rsync to copy code to VM and mount VM's drive to docker

[whitlockjc]

If you've got an example, that would be cool. If not, I'll figure it out.

[rimusz]

usually I trigger code copying with rsync via post commit hook