Admin: Created page with "To run your first Docker container, Docker provides a hello-world container. ==Get the container image== You can either explicitly pull the hello-world container from Docker..."

2017-09-23T19:11:56Z

Created page with "To run your first Docker container, Docker provides a hello-world container. ==Get the container image== You can either explicitly pull the hello-world container from Docker..."

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To run your first Docker container, Docker provides a hello-world container.

==Get the container image==

You can either explicitly pull the hello-world container from Dockerhub (recommended), or you can let Docker take care of it for you.

===Pull container image from dockerhub===

Pull the hello-world image from Dockerhub:

<pre>
$ docker pull hello-world
</pre>

===List all container images===

Use the docker images command to list all the container images in Docker:

<pre>
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest 05a3bd381fc2 10 days ago 1.84kB
</pre>

===Run the hello-world container===

To run the container, use the docker run command:

<pre>
$ docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
5b0f327be733: Pull complete
Digest: sha256:1f19634d26995c320618d94e6f29c09c6589d5df3c063287a00e6de8458f8242
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
https://cloud.docker.com/

For more examples and ideas, visit:
https://docs.docker.com/engine/userguide/
</pre>

==Remove the container image==

Now remove the image from your system entirely. This is a two step process:
* Remove the stopped process
* Remove the container image

===Remove the stopped process===

After you run the hello-world container, it will print out its hello world message, then shut down. However, if you try to remove the image straight away, you'll get an error:

<pre>
$ docker rmi 05a3bd381fc2
Error response from daemon: conflict: unable to delete 05a3bd381fc2 (must be forced) - image is being used by stopped container 31155e25a61e
</pre>

This is because, even when a container image has finished running, it remains in the process queue as a "stopped" process. You have to delete the stopped process first, then you can delete the image.

To list all processes, including stopped processes:

<pre>
$ docker ps -a
</pre>

Use the container ID or the name to remove the stopped image:

<pre>
$ docker rm 31155e25a61e

$ docker rm quirky_twain
</pre>

===Remove the container image===

Now that you've removed the stopped process, you can remove the container image using its name or its ID:

<pre>
$ docker rmi 05a3bd381fc2
Untagged: hello-world:latest
Untagged: hello-world@sha256:1f19634d26995c320618d94e6f29c09c6589d5df3c063287a00e6de8458f8242
Deleted: sha256:05a3bd381fc2470695a35f230afefd7bf978b566253199c4ae5cc96fafa29b37
Deleted: sha256:3a36971a9f14df69f90891bf24dc2b9ed9c2d20959b624eab41bbf126272a023
</pre>

or

<pre>
$ docker rm hello-world
</pre>

==Flags==

{{DockerFlag}}

Docker/Hello World - Revision history

Admin: Created page with "To run your first Docker container, Docker provides a hello-world container. ==Get the container image== You can either explicitly pull the hello-world container from Docker..."