docker inspect
Estimated reading time: 2 minutesDescription
Return low-level information on Docker objects
Usage
docker inspect [OPTIONS] NAME|ID [NAME|ID...]
Options
Name, shorthand | Default | Description |
--format , -f |
Format the output using the given Go template | |
--size , -s |
Display total file sizes if the type is container | |
--type |
Return JSON for specified type |
Parent command
Command | Description |
---|---|
docker | The base command for the Docker CLI. |
Extended description
Docker inspect provides detailed information on constructs controlled by Docker.
By default, docker inspect
will render results in a JSON array.
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