Docker volumes-from blank, from network share - docker

Question

I have two container one is setup as a data volume, I can go inside the data container and explore the files that are mounted from a network share with out any issues.
how ever on the second docker instance when I go to the folder with mounted volumes the folder exists but all the files and directories that should be there are not visible.
this used to work so I can only assume its due to docker 1.9 I am seeing this on a linux and mac box.
Any ideas as to the cause ? is this a bug or is there something else i can investigate ?
output of inspect.
"Volumes": {
"/mnt/shared_app_data": {},
"/srv/shared_app_data": {}
},
"Mounts": [
{
"Name": "241d3e495f312c79abbeaa9495fa3b32110e9dca8442291d248cfbc5acca5b53",
"Source": "/var/lib/docker/volumes/241d3e495f312c79abbeaa9495fa3b32110e9dca8442291d248cfbc5acca5b53/_data",
"Destination": "/mnt/shared_app_data",
"Driver": "local",
"Mode": "",
"RW": true
},
{
"Name": "061f16c066b59f31baac450d0d97043d1fcdceb4ceb746515586e95d26c91b57",
"Source": "/var/lib/docker/volumes/061f16c066b59f31baac450d0d97043d1fcdceb4ceb746515586e95d26c91b57/_data",
"Destination": "/srv/shared_app_data",
"Driver": "local",
"Mode": "",
"RW": true
}
],
the files are mounted in the docker file in this manner
RUN echo '/srv/path ipaddress/255.255.255.0(rw,no_root_squash,subtree_check,fsid=0)' >> /etc/exports
RUN echo 'ipaddress:/srv/path /srv/shared_app_data nfs defaults 0 0' >> /etc/fstab
RUN echo 'ipaddress:/srv/path /mnt/shared_app_data nfs defaults 0 0' >> /etc/fstab
and then when the container starts it runs.
service rpcbind start
mount -a

Answer 1

You need to be sure that the second container does mount the VOLUME declared in the first one
docker run --volumes-from first_container second_container
Make sure the first container does have the right files: see "Locating a volume"
docker inspect first_container
# more precisely
sudo ls $(docker inspect -f '{{ (index .Mounts 0).Source }}' first_container)