# tag

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Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE

### Aliases

`docker image tag`, `docker tag`


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## Description

An image name is made up of slash-separated name components, optionally prefixed
by a registry hostname. The hostname must comply with standard DNS rules, but
may not contain underscores. If a hostname is present, it may optionally be
followed by a port number in the format `:8080`. If not present, the command
uses Docker's public registry located at `registry-1.docker.io` by default. Name
components may contain lowercase letters, digits and separators. A separator
is defined as a period, one or two underscores, or one or more hyphens. A name
component may not start or end with a separator.

A tag name must be valid ASCII and may contain lowercase and uppercase letters,
digits, underscores, periods and hyphens. A tag name may not start with a
period or a hyphen and may contain a maximum of 128 characters.

You can group your images together using names and tags, and then upload them
to [*Share images on Docker Hub*](https://docs.docker.com/get-started/part3/).

## Examples

### Tag an image referenced by ID

To tag a local image with ID "0e5574283393" into the "fedora" repository with
"version1.0":

```console
$ docker tag 0e5574283393 fedora/httpd:version1.0
```

### Tag an image referenced by Name

To tag a local image with name "httpd" into the "fedora" repository with
"version1.0":

```console
$ docker tag httpd fedora/httpd:version1.0
```

Note that since the tag name is not specified, the alias is created for an
existing local version `httpd:latest`.

### Tag an image referenced by Name and Tag

To tag a local image with name "httpd" and tag "test" into the "fedora"
repository with "version1.0.test":

```console
$ docker tag httpd:test fedora/httpd:version1.0.test
```

### Tag an image for a private repository

To push an image to a private registry and not the central Docker
registry you must tag it with the registry hostname and port (if needed).

```console
$ docker tag 0e5574283393 myregistryhost:5000/fedora/httpd:version1.0
```
