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docker-archive / for-aws

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Unable to mount EBS volume. #179

Open darkl0rd opened 5 years ago

darkl0rd commented 5 years ago

Expected behavior

My volume to be mounted inside the container when defining it either on the CLI or through a compose-file.

Actual behavior

A diversity of errors when mounting the volume.

$ docker volume create -d cloudstor:aws -o size=1 test
$ docker volume ls -fname=test
DRIVER              VOLUME NAME
cloudstor:aws       test
$ docker run -ti --rm -v test:/x alpine /bin/sh
docker: Error response from daemon: VolumeDriver.Mount: error mounting volume: failed to open device to probe ext4: open /dev/xvdf: no such file or directory.

When attempting to start a docker swarm service, which refers to a volume; the volume is also created successfully but unable to be mounted in the resulting service.

Sometimes the error is different, and does it not complain about the device name but about the filesystem (ext4).

Information

docker 18.06.1-ce docker-compose 1.21.2 docker4x/cloudstor 18.06.1-ce-aws1

plugin installed as follows:

$ docker plugin install --alias cloudstor:aws --grant-all-permissions docker4x/cloudstor:18.06.1-ce-aws1 AWS_REGION=eu-west-1 CLOUD_PLATFORM=AWS AWS_STACK_ID=eu-west-1 EFS_SUPPORTED=0
$ docker plugin ls
ID                  NAME                DESCRIPTION                       ENABLED
fc5f08324f3b        cloudstor:aws       cloud storage plugin for Docker   true

IAM policy created as required (Conform the CF template). Even went one step further and set the permissions to allow ec2:*.

darkl0rd commented 5 years ago

The problem seems to come forth out of the fact that AWS has decided to name their devices differently. On the instance they are named '/dev/xvdf', whereas in the OS the device is named /dev/nvme2n1.

$ docker run -ti --rm -v test:/tmp alpine /bin/sh
docker: Error response from daemon: VolumeDriver.Mount: error mounting volume: failed to open device to probe ext4: open /dev/xvdf: no such file or directory.
$ ln -sf /dev/nvme2n1 /dev/xvdf 
$ docker run -ti --rm -v test:/tmp alpine df -h /tmp
Filesystem                Size      Used Available Use% Mounted on
/dev/xvdf               975.9M      2.5M    906.2M   0% /tmp
tperelle commented 5 years ago

Its the same problem as #184