Docker Container Mount Name, Type and other values

Question

I am writing a bash script and I am aware that I can get information of the mounts attached to a container using docker inspect --format '{{.Mounts}}' <container-name> which gives a result such as this:

[{volume portainer-data /docker/portainer/data /data local-persist rw true } {bind /var/run/docker.sock /var/run/docker.sock rw true rprivate}]

which is an abbreviated version of the full JSON:

 "Mounts": [
            {
                "Type": "volume",
                "Name": "portainer-data",
                "Source": "/docker/portainer/data",
                "Destination": "/data",
                "Driver": "local-persist",
                "Mode": "rw",
                "RW": true,
                "Propagation": ""
            },
            {
                "Type": "bind",
                "Source": "/var/run/docker.sock",
                "Destination": "/var/run/docker.sock",
                "Mode": "rw",
                "RW": true,
                "Propagation": "rprivate"
            }
        ],

How can I get that information so that I could check the Type and then use the Name (or any of the other values)?

I've tried docker inspect --format '{{.Mounts}}{{.Type}}' but it doesn't work however a similar command docker ps --format '{{.ID}}: {{ .Mounts }}' prints the container name and the mounts.

Answer 1

So, if anything, {{Mounts.Type}} should work. If it doesn't, jq is your friend an can work with JSON documents directly, e.g.,

docker inspect container-name \
  | jq \
  '.[] 
   | {
      "container": .Name,
      "mount": .Mounts.[] 
       | {"source": .Source, "target": .Destination, "type": .Type}
     }
  '

should give you a sequence of JSON objects, each like

{
  "container": "mycoolcontaier",
  "mount": {
    "source": "/home/marcus/data",
    "target": "/data",
    "type": "bind"
  }
}

so that I could check the Type and then use the Name

that sounds like you need some kind of string parsing to do that looking-for-types, and jq can absorb that!

docker inspect container-name \
  | jq \
  '.[] 
   | {
      "container": .Name,
      "mount": .Mounts.[] 
       | {"source": .Source, "target": .Destination, "type": .Type}
     }
   | select(.mount.type == "bind")
  ' 

gives you only the bind-type mounts.