docker inspect

Return low-level information on Docker objects

Usage

$ docker inspect [OPTIONS] NAME|ID [NAME|ID...]

Refer to the options section for an overview of available OPTIONS for this command.

Description

Docker inspect provides detailed information on constructs controlled by Docker.

By default, docker inspect will render results in a JSON array.

For example uses of this command, refer to the examples section below.

Options

Examples

Get an instance’s IP address

For the most part, you can pick out any field from the JSON in a fairly straightforward manner.

$ docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $INSTANCE_ID

Get an instance’s MAC address

$ docker inspect --format='{{range .NetworkSettings.Networks}}{{.MacAddress}}{{end}}' $INSTANCE_ID

Get an instance’s log path

$ docker inspect --format='{{.LogPath}}' $INSTANCE_ID

Get an instance’s image name

$ docker inspect --format='{{.Config.Image}}' $INSTANCE_ID

List all port bindings

You can loop over arrays and maps in the results to produce simple text output:

$ docker inspect --format='{{range $p, $conf := .NetworkSettings.Ports}} {{$p}} -> {{(index $conf 0).HostPort}} {{end}}' $INSTANCE_ID

Find a specific port mapping

The .Field syntax doesn’t work when the field name begins with a number, but the template language’s index function does. The .NetworkSettings.Ports section contains a map of the internal port mappings to a list of external address/port objects. To grab just the numeric public port, you use index to find the specific port map, and then index 0 contains the first object inside of that. Then we ask for the HostPort field to get the public address.

$ docker inspect --format='{{(index (index .NetworkSettings.Ports "8787/tcp") 0).HostPort}}' $INSTANCE_ID

Get a subsection in JSON format

If you request a field which is itself a structure containing other fields, by default you get a Go-style dump of the inner values. Docker adds a template function, json, which can be applied to get results in JSON format.

$ docker inspect --format='{{json .Config}}' $INSTANCE_ID