Hi Prefect How can I mount a predefined Docker volume when u Prefect Community #ask-community

Hi Prefect, How can I mount a predefined Docker vo...

Peter Roelants

01/30/2021, 8:36 AM

Hi Prefect, How can I mount a predefined Docker volume when using the Docker Agent? For example I have a volume named

"test-volume"

created with

docker volume create test-volume

If I want to mount the named docker volume

"test-volume"

with

prefect agent docker start --volume test-volume:$DOCKER_DIR ...

, the named volume is never mounted into the runtime started by the agent, a new volume seems to be created and mounted each time.

Peter Roelants

01/30/2021, 8:37 AM

Everything works as expected when I mount a regular local folder from my local host when starting the agent with

prefect agent docker start --volume "$HOST_DIR:$DOCKER_DIR" ...

Peter Roelants

01/30/2021, 1:15 PM

The volumes mounted by the container that is started by the Docker Agent look like:

Copy code

"Mounts": [
            {
                "Type": "volume",
                "Name": "d1bb31c7fea65bb5b99c427087f20a5d9659e6c9bf5324697a4dfe97141a7d82",
                "Source": "/var/lib/docker/volumes/d1bb31c7fea65bb5b99c427087f20a5d9659e6c9bf5324697a4dfe97141a7d82/_data",
                "Destination": "/root/download",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],

My volumes look like:

Copy code

VOLUME NAME                                                        LINKS     SIZE
f1e51e432fc828a923e31fee3a5e9462585d70a0b3cec3cb97a16d1136d4bcb6   1         52.22MB
test-volume                                                        0         0B
d1bb31c7fea65bb5b99c427087f20a5d9659e6c9bf5324697a4dfe97141a7d82   1         5B

Peter Roelants

01/30/2021, 1:18 PM

Am I doing something wrong, or should I file an issue?

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