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fermayo/imagefs

POC ONLY

Volume plugin to mount images into containers

Usage

Run the plugin as a service on a swarm:

$ docker service create \
    --name imagefs \
    --mode global \
    --mount type=bind,source=/var/run/docker.sock,destination=/var/run/docker.sock \
    --mount type=bind,source=/var/run/docker/plugins,destination=/run/docker/plugins \
    --mount type=bind,source=/var/lib/docker,destination=/var/lib/docker \
    fermayo/imagefs:latest

Now you will see all your local images as volumes:

$ docker volume ls
DRIVER                   VOLUME NAME
imagefs                  2941e8b0086fa6140c59523fb12865461e8c6adeab50732a05a6fe4a886ef836
imagefs                  5745de9bbf7c7cbabbc7dee2da35ade343f59ff07ce02787a10dfaa6a935efd7
imagefs                  71fd841bdcb61b4e91d6d4b6df030f9371ac9dbef27e51c1a5994c38c63c7c44
imagefs                  7afbc2b03b9e6259c8b85457ca94490a1856d13a798ec0040c423543b66a9511
imagefs                  88e169ea8f46ff0d0df784b1b254a15ecfaf045aee1856dca1ec242fdd231ddd
imagefs                  ad974e767ec4f06945b1e7ffdfc57bd10e06baf66cdaf5a003e0e6a36924e30b
imagefs                  d34c8c7c784a39e07cd7978a4f541bde3666ced2b5b7b6c7509b161fc4a6ae64
imagefs                  f49eec89601e8484026a8ed97be00f14db75339925fad17b440976cffcbfb88a

You can mount any image on your container:

$ docker run -it -v 88e169ea8f46ff0d0df784b1b254a15ecfaf045aee1856dca1ec242fdd231ddd:/tmp:ro ubuntu cat /tmp/etc/os-release
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.5.0
PRETTY_NAME="Alpine Linux v3.5"
HOME_URL="http://alpinelinux.org"
BUG_REPORT_URL="http://bugs.alpinelinux.org"

Limitations

  • Does not pull layers that are not present locally in the node
  • Only mounts one layer at a time (does not mount parent layers)
  • Does not prevent writes to the image (does not have a write layer on top)
  • Only supports overlay2 graphdriver