How to make it work with docker

[ptptptptptpt]

Hi, hustcat,

Thanks for your work on the ceph graph driver. I have build & run it successfully, but don't know how to let docker use it for backend storage.

I saw the PR of graphdriver_extpoints from cpuguy83 has been merged:
moby/moby@4c55464
https://github.com/docker/docker/blob/release/v1.9/experimental/plugins_graphdriver.md

And I've got experimental binary:
https://experimental.docker.com/builds/Linux/x86_64/docker-latest

# docker -v
Docker version 1.9.1, build f4c9adf, experimental

But don't know how to enable the feature ...

# docker daemon -s rbd
WARN[0000] Running experimental build
INFO[0000] API listen on /var/run/docker.sock
ERRO[0000] Failed to GetDriver graph rbd /var/lib/docker/0.0
FATA[0000] Error starting daemon: error initializing graphdriver: driver not supported

Best regards!

[ptptptptptpt]

The plugin is already running and listening:

# /root/bin/docker-graph-driver -D -s rbd
DEBU[0000] Rbd setup base image                         
INFO[0000] listening on /run/docker/plugins/rbd.sock

DEBU[0000] root group found. gid: 0    

Test it OK:

# echo -e "POST /Plugin.Activate HTTP/1.0\r\n" | nc -U /run/docker/plugins/rbd.sock
HTTP/1.0 200 OK
Content-Type: appplication/vnd.docker.plugins.v1+json
Date: Fri, 15 Jan 2016 02:10:55 GMT
Content-Length: 32

{"Implements": ["GraphDriver"]}

The output of adding -D to docker daemon:

# docker daemon -D -s rbd
WARN[0000] Running experimental build                   
DEBU[0000] docker group found. gid: 118                 
DEBU[0000] Server created for HTTP on unix (/var/run/docker.sock) 
INFO[0000] API listen on /var/run/docker.sock           
DEBU[0000] Creating actual daemon root: /var/lib/docker/0.0 
DEBU[0000] [graphdriver] trying provided driver "rbd"   
DEBU[0000] rbd's manifest: &{[GraphDriver]}             
DEBU[0000] rbd implements: GraphDriver                  
ERRO[0000] Failed to GetDriver graph rbd /var/lib/docker/0.0 
FATA[0000] Error starting daemon: error initializing graphdriver: driver not supported

Stop the docker-graph-driver pluging and run docker, the output is:

# docker daemon -D -s rbd
WARN[0000] Running experimental build                   
DEBU[0000] docker group found. gid: 118                 
DEBU[0000] Server created for HTTP on unix (/var/run/docker.sock) 
INFO[0000] API listen on /var/run/docker.sock           
DEBU[0000] Creating actual daemon root: /var/lib/docker/0.0 
DEBU[0000] [graphdriver] trying provided driver "rbd"   
WARN[0000] Unable to connect to plugin: /run/docker/plugins/rbd.sock, retrying in 1s 
WARN[0001] Unable to connect to plugin: /run/docker/plugins/rbd.sock, retrying in 2s 
WARN[0003] Unable to connect to plugin: /run/docker/plugins/rbd.sock, retrying in 4s 
WARN[0007] Unable to connect to plugin: /run/docker/plugins/rbd.sock, retrying in 8s 
ERRO[0015] Failed to GetDriver graph rbd /var/lib/docker/0.0 
FATA[0015] Error starting daemon: error initializing graphdriver: driver not supported

[bacaldwell]

Was this ever resolved? I'm interested in trying this as well. Thanks for the complete debugging output.