{"id":2319,"date":"2021-03-10T20:36:16","date_gmt":"2021-03-10T18:36:16","guid":{"rendered":"https:\/\/www.virtono.com\/community\/?p=2319"},"modified":"2021-03-14T18:32:09","modified_gmt":"2021-03-14T16:32:09","slug":"overview-of-docker-commands-part-1","status":"publish","type":"post","link":"https:\/\/www.virtono.com\/community\/knowledgebase\/overview-of-docker-commands-part-1\/","title":{"rendered":"Overview of Docker Commands Part – 1"},"content":{"rendered":"\n

I suggest you get machine to follow along this part. So here’s a little plug of our own: Cloud VPS, for as little as \u20ac2.95 a month.<\/a><\/p>\n\n\n\n

This article is a part of our complete series of articles on Docker. Click here to access the Free Series<\/a>.<\/p>\n\n\n\n

Back to the article now…<\/p>\n\n\n\n

We have to use \u201cdocker\u201d on the CLI to run commands pertaining to docker.<\/p>\n\n\n\n

The best way to get started is to use \u201cdocker –help\u201d , you will immediately be bombarded with all the commands you can run using docker.<\/p>\n\n\n\n

It can feel over whelming at first, but not to sweat by the end of these tutorials you will be familiar with a lot of them and on your way to deep dive even further.<\/p>\n\n\n\n

At the end of this you can see: docker COMMAND –help<\/p>\n\n\n\n

This command in particular will help us understand other commands.<\/p>\n\n\n\n

Let\u2019s say we wanted to understand more about \u201cdocker image\u201d, we will run \u201cdocker image –help\u201d<\/p>\n\n\n\n

You will see this output:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Basics of working with Images and Containers<\/p>\n\n\n\n

Now we will download and work with an image for postgres database.<\/p>\n\n\n\n

Checking if we have the required image:<\/strong><\/p>\n\n\n\n

When you ran the docker command \u201cdocker image –help\u201d, you should\u2019ve seen the ls command.<\/p>\n\n\n\n

So lets use it and check if we have a postgres image with us.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

This is what your output must be looking like, if you have followed the previous article for Docker Installation.<\/p>\n\n\n\n

However we do not see the postgres image.<\/p>\n\n\n\n

Pulling the required Image:<\/strong><\/p>\n\n\n\n

Since we are trying to install postgres, this is the command you will run:<\/p>\n\n\n\n

docker image pull postgres<\/p>\n\n\n\n

General Command : docker image pull < REQUIRED IMAGE NAME><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

If you are thinking that the image is being is pulled out of thin air, well first, congratulations for not loosing your innocence and sense of wonder. Secondly, please go through the Docker Architecture article to understand the workings.<\/p>\n\n\n\n

Lets check if the image is now in our system:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Gathering more information related to the image:<\/strong><\/p>\n\n\n\n

So you just downloaded an image, and you ofcourse need to understand more about it before running it.<\/p>\n\n\n\n

For this purpose we have the inspect command:<\/p>\n\n\n\n

docker image inspect <IMAGE ID><\/p>\n\n\n\n

Note: Image ID is available by running docker image ls, like previous step.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

You will be greeted with a \u201cNovel\u201d about the image in json format.<\/p>\n\n\n\n

Not everything is important, only pay attention to the main characters for now.<\/p>\n\n\n\n

Environment Variable that are defined are present as \u201cEnv\u201d<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Command that is performed when we start the container<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

In the Config section you can find the info like Exposed Port where you can find the service provided by this image.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

In this case Postgres will be running on 5432 port.<\/p>\n\n\n\n

Starting a Container from Image<\/strong><\/p>\n\n\n\n

Now that we have our image on our box, let us create a container out of it.<\/p>\n\n\n\n

Starting a container requires you to use the run command.<\/p>\n\n\n\n

Running the command with \u201c–help\u201d will fetch you the Options that you can use.<\/p>\n\n\n\n

For now let\u2019s try to run the container by using the run command:<\/p>\n\n\n\n

docker container run postgres<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

We get an error.<\/p>\n\n\n\n

Now this error is specific to postgres, as we are trying to run a database service, we need to specify a password for the superuser, trust all connections.<\/p>\n\n\n\n

So lets give a password:<\/p>\n\n\n\n

docker  container run -e POSTGRES_PASSWORD=postgres postgres <\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Exiting Containers<\/strong><\/p>\n\n\n\n

Press \u2018Ctrl+C\u2019 to exit the container, you will see this:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Doing a \u201cdocker container ls -a\u201d, you will notice that the container is  in exited state.<\/p>\n\n\n\n

So how do we run a container and not let it hinder our usual process, or run a container in the background?<\/p>\n\n\n\n

If you had noticed the \u201cdocker container run\u201d command has an option \u201c-d\u201d this runs a detached container.<\/p>\n\n\n\n

So lets try that:<\/p>\n\n\n\n

docker  container run -e POSTGRES_PASSWORD=postgres -d postgres<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Voila!<\/p>\n\n\n\n

Now you have a container running in the background!<\/p>\n\n\n\n

But the fun doesn\u2019t end here, we will now discuss, how to access a container in the next tutorial!<\/p>\n","protected":false},"excerpt":{"rendered":"

I suggest you get machine to follow along this part. So here’s a little plug of our own: Cloud VPS, for as little as \u20ac2.95 a month. This article is a part of our complete series of articles on Docker. Click here to access the Free Series. Back to the<\/p>\n","protected":false},"author":4,"featured_media":2346,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[5,3],"tags":[],"class_list":["post-2319","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledgebase","category-tutorial-how-to"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.virtono.com\/community\/wp-content\/uploads\/2021\/03\/1_HS1OsFO7ayf_ZUzPus1FCQ.jpeg?fit=1280%2C720&ssl=1","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p7ISfL-Bp","jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":3626,"url":"https:\/\/www.virtono.com\/community\/tutorial-how-to\/how-to-configure-a-private-docker-registry-in-ubuntu-22-04\/","url_meta":{"origin":2319,"position":0},"title":"How to Configure a Private Docker Registry in Ubuntu 22.04","author":"George B.","date":"June 26, 2023","format":false,"excerpt":"There are situations where you might want to set up your own private Docker registry even though Docker Hub offers a public registry for storing and sharing Docker images. In this guide, we'll show you how to set up a private Docker registry on Ubuntu 22.04 so you can manage\u2026","rel":"","context":"In "Tutorials"","block_context":{"text":"Tutorials","link":"https:\/\/www.virtono.com\/community\/category\/tutorial-how-to\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.virtono.com\/community\/wp-content\/uploads\/2023\/06\/How-to-Configure-a-Private-Docker-Registry-in-Ubuntu-22-04.png?fit=600%2C330&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.virtono.com\/community\/wp-content\/uploads\/2023\/06\/How-to-Configure-a-Private-Docker-Registry-in-Ubuntu-22-04.png?fit=600%2C330&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.virtono.com\/community\/wp-content\/uploads\/2023\/06\/How-to-Configure-a-Private-Docker-Registry-in-Ubuntu-22-04.png?fit=600%2C330&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":2349,"url":"https:\/\/www.virtono.com\/community\/knowledgebase\/overview-of-docker-commands-part-2\/","url_meta":{"origin":2319,"position":1},"title":"Overview of Docker Commands Part – 2","author":"Shreyash Sharma","date":"March 17, 2021","format":false,"excerpt":"In the previous tutorial, we went through the steps to get a container up and running. We used Postgres as an example. This section of the tutorial series will continue to build on that. In this section we will learn how to interact with the container, how to execute commands\u2026","rel":"","context":"In "Knowledgebase"","block_context":{"text":"Knowledgebase","link":"https:\/\/www.virtono.com\/community\/category\/knowledgebase\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.virtono.com\/community\/wp-content\/uploads\/2021\/03\/docker-commands-1200x385-1.jpg?fit=1200%2C385&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.virtono.com\/community\/wp-content\/uploads\/2021\/03\/docker-commands-1200x385-1.jpg?fit=1200%2C385&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.virtono.com\/community\/wp-content\/uploads\/2021\/03\/docker-commands-1200x385-1.jpg?fit=1200%2C385&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.virtono.com\/community\/wp-content\/uploads\/2021\/03\/docker-commands-1200x385-1.jpg?fit=1200%2C385&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.virtono.com\/community\/wp-content\/uploads\/2021\/03\/docker-commands-1200x385-1.jpg?fit=1200%2C385&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":3221,"url":"https:\/\/www.virtono.com\/community\/tutorial-how-to\/remove-docker-containers-images-and-volumes\/","url_meta":{"origin":2319,"position":2},"title":"Remove Docker Containers, Images, and Volumes","author":"George B.","date":"April 11, 2023","format":false,"excerpt":"Docker provides a comprehensive set of command-line tools that enable you to clean up your system effectively. If you are a beginner with Docker, this article can serve as a useful cheat sheet for reference. 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WordPress is a popular content management system (CMS) that is used by millions of websites worldwide. 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