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Moataz Burhan
Moataz Burhan

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100DaysOfCode — Day 05

#docker #kubernetes #100daysofcode

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In this series, I will alternate between Go language learning, Docker concepts, and Kubernetes.

Today, I finished a basic docker tutorial. I am glad to share it with you.

Prerequisite

  1. Install docker

What is a container?

Docker provides the ability to package and run an application in a loosely isolated environment called a container. A container is simply another process on your machine that has been isolated from all other processes on the host machine.

Your first container

Open a command prompt or bash window, and run the command:

$ docker run -dp 80:80 --name getting-started docker/getting-started
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  • docker run Run a command in a new container
  • -d Run container in background and print container ID
  • -p 80:80 Publish a container's port(s) to the host
  • docker/getting-started Docker image to run
  • --name getting-started Assign a name to the container

Test your container 

$ docker ps
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  • docker ps List containers

You see a list like this shows a container running docker/getting-started image.

CONTAINER ID   IMAGE                    COMMAND                  CREATED         STATUS         PORTS                NAMES
1af9e7993c08   docker/getting-started   "nginx -g 'daemon of…"   2 minutes ago   Up 2 minutes   0.0.0.0:80->80/tcp   getting-started
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Now open your browser and go to http://localhost/. Boom ... your container is up and running:
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End the container

Now run the following command to end the container:

$ docker stop getting-started
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Now list the containers

$ docker ps
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CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES
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Note that docker container has stopped but it is still in your system. You can see stopped containers using the following command:

$ docker ps -a
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You will see this:

CONTAINER ID   IMAGE                    COMMAND                  CREATED          STATUS                     PORTS     NAMES
1af9e7993c08   docker/getting-started   "nginx -g 'daemon of…"   6 minutes ago    Exited (0) 3 minutes ago             getting-started
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To remove the container run the following command:

$ docker rm getting-started
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$ docker ps -a
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Remove the image

Note that docker/getting-started image was downloaded when ran docker run command. Run the following command to see image in your system:

$ docker images
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REPOSITORY                    TAG       IMAGE ID       CREATED         SIZE
docker/getting-started        latest    3c156928aeec   9 months ago    24.8MB
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Run the following command to remove the downloaded image:

$ docker rmi docker/getting-started
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Untagged: docker/getting-started:latest
Untagged: docker/getting-started@sha256:d2c4fb0641519ea208f20ab03dc40ec2a5a53fdfbccca90bef14f870158ed577
Deleted: sha256:3c156928aeec9595a140d3e9bb67fc6849650a0a756bbb0b1690ce9a4ddca884
Deleted: sha256:bd0923edebaabd47c31d4f79115f9cbd91e6045c9b2585f02b346af81a6d3dbd
Deleted: sha256:0d6528f3488cda7f74d825579182af56cbdd7fed5bccacfa3042834b514157ac
Deleted: sha256:ec7d8444b0ff84cd1e55ec191abe60e26f996ac883d87dcb50fdca507f2af8be
Deleted: sha256:beee9f30bc1f711043e78d4a2be0668955d4b761d587d6f60c2c8dc081efb203
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End of day 5 of 100DaysOfCode.

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