Local NFS volumes do not resolve hostnames

[pdevine]

Description

If you create an NFS volume using the local storage driver, you have to use the IP address of the NFS host. If you use the host name, your container will fail to start and will return "docker: Error response from daemon: invalid argument."

Steps to reproduce the issue:

1. create an NFS server and export a directory
2. create a docker volume using "docker volume create -o type=nfs -o o=addr=my_host,rw -o device=:/exports --name foo"
3. start a container mounting that volume with "docker run -it --rm -v foo:/storage alpine sh"

Describe the results you received:

$ docker run -it -v foo:/storage alpine sh
docker: Error response from daemon: invalid argument.

Describe the results you expected:

If you use it with an IP address you get:
$ docker run -it -v foo:/storage alpine sh
/ # ls /storage/
docker

Additional information you deem important (e.g. issue happens only occasionally):

Output of docker version:

Client:
Version: 1.12.1
API version: 1.24
Go version: go1.6.3
Git commit: 23cf638
Built: Thu Aug 18 05:33:38 2016
OS/Arch: linux/amd64

Server:
Version: 1.12.1
API version: 1.24
Go version: go1.6.3
Git commit: 23cf638
Built: Thu Aug 18 05:33:38 2016
OS/Arch: linux/amd64

Output of docker info:

Containers: 11
Running: 10
Paused: 0
Stopped: 1
Images: 45
Server Version: 1.12.1
Storage Driver: aufs
Root Dir: /var/lib/docker/aufs
Backing Filesystem: extfs
Dirs: 99
Dirperm1 Supported: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: host bridge null overlay
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Security Options: apparmor seccomp
Kernel Version: 4.4.0-22-generic
Operating System: Ubuntu 16.04 LTS
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 975.1 MiB
Name: clone13
ID: VCBT:FE4P:AA65:W5NF:53RX:7D7U:MECQ:G2IQ:EP23:MVWQ:DCGC:MAA7
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
WARNING: No swap limit support
Cluster Store: etcd://192.168.36.247:12379
Cluster Advertise: 192.168.36.247:12376
Insecure Registries:
127.0.0.0/8

Additional environment details (AWS, VirtualBox, physical, etc.):

This is using VMware Fusion. The NFS server is the standard one packaged with Ubuntu 16.04.

[justincormack]

Yes, the local driver simply passes the arguments to the mount syscall, and does not know specifically about nfs at present. I think someone was looking into this.

[dattatrayakumbhar]

#dibs I would like to work on this issue.

[thaJeztah]

Thanks @dattatrayakumbhar04