103 lines
3.3 KiB
Markdown
103 lines
3.3 KiB
Markdown
---
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title: "inspect"
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description: "The inspect command description and usage"
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keywords: "inspect, container, json"
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---
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<!-- This file is maintained within the docker/docker Github
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repository at https://github.com/docker/docker/. Make all
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pull requests against that repo. If you see this file in
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another repository, consider it read-only there, as it will
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periodically be overwritten by the definitive file. Pull
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requests which include edits to this file in other repositories
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will be rejected.
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-->
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# inspect
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```markdown
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Usage: docker inspect [OPTIONS] NAME|ID [NAME|ID...]
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Return low-level information on Docker object(s) (e.g. container, image, volume,
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network, node, service, or task) identified by name or ID
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Options:
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-f, --format Format the output using the given Go template
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--help Print usage
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-s, --size Display total file sizes if the type is container
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--type Return JSON for specified type
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```
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By default, this will render all results in a JSON array. If the container and
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image have the same name, this will return container JSON for unspecified type.
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If a format is specified, the given template will be executed for each result.
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Go's [text/template](http://golang.org/pkg/text/template/) package
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describes all the details of the format.
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## Examples
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**Get an instance's IP address:**
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For the most part, you can pick out any field from the JSON in a fairly
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straightforward manner.
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{% raw %}
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$ docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $INSTANCE_ID
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{% endraw %}
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**Get an instance's MAC address:**
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For the most part, you can pick out any field from the JSON in a fairly
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straightforward manner.
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{% raw %}
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$ docker inspect --format='{{range .NetworkSettings.Networks}}{{.MacAddress}}{{end}}' $INSTANCE_ID
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{% endraw %}
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**Get an instance's log path:**
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{% raw %}
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$ docker inspect --format='{{.LogPath}}' $INSTANCE_ID
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{% endraw %}
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**Get a Task's image name:**
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{% raw %}
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$ docker inspect --format='{{.Container.Spec.Image}}' $INSTANCE_ID
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{% endraw %}
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**List all port bindings:**
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One can loop over arrays and maps in the results to produce simple text
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output:
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{% raw %}
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$ docker inspect --format='{{range $p, $conf := .NetworkSettings.Ports}} {{$p}} -> {{(index $conf 0).HostPort}} {{end}}' $INSTANCE_ID
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{% endraw %}
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**Find a specific port mapping:**
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The `.Field` syntax doesn't work when the field name begins with a
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number, but the template language's `index` function does. The
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`.NetworkSettings.Ports` section contains a map of the internal port
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mappings to a list of external address/port objects. To grab just the
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numeric public port, you use `index` to find the specific port map, and
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then `index` 0 contains the first object inside of that. Then we ask for
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the `HostPort` field to get the public address.
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{% raw %}
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$ docker inspect --format='{{(index (index .NetworkSettings.Ports "8787/tcp") 0).HostPort}}' $INSTANCE_ID
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{% endraw %}
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**Get a subsection in JSON format:**
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If you request a field which is itself a structure containing other
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fields, by default you get a Go-style dump of the inner values.
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Docker adds a template function, `json`, which can be applied to get
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results in JSON format.
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{% raw %}
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$ docker inspect --format='{{json .Config}}' $INSTANCE_ID
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{% endraw %}
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