Kubernetes pod not binding volumes to container - docker

Question

I've got the following ReplicationController JSON defined:
{
"id": "PHPController",
"kind": "ReplicationController",
"apiVersion": "v1beta1",
"desiredState": {
"replicas": 2,
"replicaSelector": {"name": "php"},
"podTemplate": {
"desiredState": {
"manifest": {
"version": "v1beta1",
"id": "PHPController",
"volumes": [{ "name": "wordpress", "path": "/mnt/nfs/wordpress_a", "hostDir": "/mnt/nfs/wordpress_a"}],
"containers": [{
"name": "php",
"image": "internaluser/php53",
"ports": [{"containerPort": 80, "hostPort": 9021}],
"volumeMounts": [{"name": "wordpress", "mountPath": "/mnt/nfs/wordpress_a"}]
}]
}
},
"labels": {"name": "php"}
}},
"labels": {"name": "php"}
}
The container starts correctly when run with "docker run -t -i -p 0.0.0.0:9021:80 -v /mnt/nfs/wordpress_a:/mnt/nfs/wordpress_a:rw internaluser/php53".
/mnt/nfs/wordpress_a is an NFS share, mounted on all of the minions. Each minion has full RW access and I have verified that the share is present.
After creating the pod containers with the Replication Controller, I can see that the volume was never actually bound, and/or incorrectly mounted:
"Volumes": {
"/mnt/nfs/wordpress_a": "/var/lib/docker/vfs/dir/8b5dc8477958f5c1b894e68ab9412b41e81a34ef16dac81f0f9d4884352a90b7"
},
"VolumesRW": {
"/mnt/nfs/wordpress_a": true
}
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LxcConf": null,
"Privileged": false,
"PortBindings": {
"80/tcp": [
{
"HostIp": "",
"HostPort": "9021"
}
]
},
I find it strange that the container believes /mnt/nfs/wordpress_a is mapped to "/var/lib/docker/vfs/dir/8b5dc8477958f5c1b894e68ab9412b41e81a34ef16dac81f0f9d4884352a90b7".
From the kubelet log:
Desired [10.101.4.15]: [{Namespace:etcd Name:c823da9e-4437-11e4-a3b1-0050568421eb Manifest:{Version:v1beta1 ID:c823da9e-4437-11e4-a3b1-0050568421eb UUID:c823da9e-4437-11e4-a3b1-0050568421eb Volumes:[{Name:wordpress Source:}] Containers:[{Name:php Image:internaluser/php53 Command:[] WorkingDir: Ports:[{Name: HostPort:9021 ContainerPort:80 Protocol:TCP HostIP:}] Env:[{Name:SERVICE_HOST Value:10.1.1.1}] Memory:0 CPU:0 VolumeMounts:[{Name:wordpress ReadOnly:false MountPath:/mnt/nfs/wordpress_a}] LivenessProbe: Lifecycle: Privileged:false}] RestartPolicy:{Always:0xa99a20 OnFailure: Never:}}}]
Does anyone have experience with this sort of thing? I've been driving myself crazy troubleshooting this. Thanks!

Answer 1

Solved. The volumes syntax was incorrect.
https://github.com/GoogleCloudPlatform/kubernetes/issues/1446