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122 lines
3.6 KiB
Markdown
122 lines
3.6 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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# 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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## Description
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Docker inspect provides detailed information on constructs controlled by Docker.
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By default, `docker inspect` will render results in a JSON array.
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## Request a custom response format (--format)
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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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## Specify target type (--type)
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`--type container|image|node|network|secret|service|volume|task|plugin`
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The `docker inspect` command matches any type of object by either ID or name.
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In some cases multiple type of objects (for example, a container and a volume)
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exist with the same name, making the result ambigious.
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To restrict `docker inspect` to a specific type of object, use the `--type`
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option.
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The following example inspects a _volume_ named "myvolume"
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```bash
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$ docker inspect --type=volume myvolume
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```
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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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```bash
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$ docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $INSTANCE_ID
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```
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### Get an instance's MAC address
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```bash
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$ docker inspect --format='{{range .NetworkSettings.Networks}}{{.MacAddress}}{{end}}' $INSTANCE_ID
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```
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### Get an instance's log path
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```bash
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$ docker inspect --format='{{.LogPath}}' $INSTANCE_ID
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```
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### Get an instance's image name
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```bash
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$ docker inspect --format='{{.Config.Image}}' $INSTANCE_ID
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```
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### List all port bindings
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You can loop over arrays and maps in the results to produce simple text
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output:
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```bash
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$ docker inspect --format='{{range $p, $conf := .NetworkSettings.Ports}} {{$p}} -> {{(index $conf 0).HostPort}} {{end}}' $INSTANCE_ID
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```
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### Find a specific port mapping
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The `.Field` syntax doesn't work when the field name begins with a
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number, but the template language's `index` function does. The
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`.NetworkSettings.Ports` section contains a map of the internal port
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mappings to a list of external address/port objects. To grab just the
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numeric public port, you use `index` to find the specific port map, and
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then `index` 0 contains the first object inside of that. Then we ask for
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the `HostPort` field to get the public address.
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```bash
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$ docker inspect --format='{{(index (index .NetworkSettings.Ports "8787/tcp") 0).HostPort}}' $INSTANCE_ID
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```
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### Get a subsection in JSON format
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If you request a field which is itself a structure containing other
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fields, by default you get a Go-style dump of the inner values.
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Docker adds a template function, `json`, which can be applied to get
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results in JSON format.
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```bash
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$ docker inspect --format='{{json .Config}}' $INSTANCE_ID
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```
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