{"id":19245,"date":"2017-11-24T12:15:06","date_gmt":"2017-11-24T10:15:06","guid":{"rendered":"https:\/\/www.webcodegeeks.com\/?p=19245"},"modified":"2017-11-23T10:56:15","modified_gmt":"2017-11-23T08:56:15","slug":"using-docker-commit-create-change-image","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/devops\/using-docker-commit-create-change-image\/","title":{"rendered":"Using Docker Commit to Create and Change an Image"},"content":{"rendered":"

The Dockerfile<\/code> is one of the key features to Docker\u2019s success. The ability to build a new container image from a simple text file changed the technology game.<\/p>\n

When it comes to modifying a Docker image, our first thought is modifying the underlying Dockerfile<\/code>. In today\u2019s article, I\u2019m going to show you another way to create and change a Docker image. We will do this using the docker commit<\/code> command.<\/p>\n

Starting with a Base Image<\/h2>\n

In today\u2019s article, we are going to take a base Redis container image and add a new user to the container. While this example may be a bit generic, it shows how we can use the docker commit<\/code> command.<\/p>\n

Docker\u2019s commit<\/code> command allows users to take a running container and save its current state as an image. This means to add our new user, we will need a running container. To get started, let\u2019s go ahead and launch a Redis container with the docker run<\/code> command.<\/p>\n

$ docker run -d redis  \r\n99eebc7db55d7039dcf6f36726c2492003ab06249b009e7b080648f4cc168015<\/pre>\n
In the above command, we can see that we started a container in the background using the redis<\/code> image. Let\u2019s first verify that the container is in fact running with the docker ps<\/code> command.<\/p>\n
$ docker ps  \r\nCONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES  \r\n99eebc7db55d        redis               \"docker-entrypoint...\"   49 seconds ago      Up 47 seconds       6379\/tcp            upbeat_panini<\/pre>\n
Now that we have a running container, let\u2019s verify that our new user doesn\u2019t already exist. To do this, we will be using another Docker command, docker exec<\/code>.<\/p>\n
$ docker exec -it upbeat_panini \/bin\/bash  \r\nroot@99eebc7db55d:\/data#<\/pre>\n
In the above output, we can see that the docker exec<\/code> command worked, but what did it do? Let\u2019s take a second to explore what exactly the above command does.<\/p>\n
The docker exec<\/code> command is used to execute a command against a running Docker container. In the case above, we told the docker exec<\/code> command to execute \/bin\/bash<\/code>. This along with the -i<\/code> (interactive) and -t<\/code> (pseudo TTY) flags enabled us to log in to the running container.<\/p>\n
We can see that we are logged into the container via the bash<\/code> prompt, which now shows root@99eebc7db55d<\/code>. If we look at the docker ps<\/code> output above, we can see this same number. The number shows as the CONTAINER ID<\/code> number of the upbeat_panini<\/code> container. This is the same container we specified with our docker exec<\/code> command.<\/p>\n
Now that we are logged into the container, let\u2019s go ahead and verify if our \u201cnew\u201d user already exists. We can do this by searching for the user\u2019s username in the \/etc\/passwd<\/code> file.<\/p>\n
root@99eebc7db55d:\/data# grep example \/etc\/passwd<\/pre>\n
With the above output, we can see the user does not exist within this container.<\/p>\n
Adding a User and Saving the Image<\/h2>\n
Since we have verified that the example<\/code> user does not exist on a base redis<\/code> container, let\u2019s go ahead and add that user to our running container. To do this, we will use the useradd<\/code> command.<\/p>\n
root@99eebc7db55d:\/data# useradd -g redis example<\/pre>\n
If we once again execute the grep<\/code> command against the \/etc\/passwd<\/code> file, we should see this user now exists.<\/p>\n
root@99eebc7db55d:\/data# grep example \/etc\/passwd  \r\nexample:x:1000:999::\/home\/example:\/bin\/sh<\/pre>\n
Now that our user is added, let\u2019s go ahead and exit<\/code> our container going back to the host system. From there, we can execute the docker commit<\/code> command to save our image changes.<\/p>\n
When executing the docker commit<\/code> command, we will need to provide two parameters: the name of the running container upbeat_panini<\/code> and the name of our desired image output testredis:example<\/code>.<\/p>\n
$ docker commit upbeat_panini testredis:example  \r\nsha256:6f68e12ee78732258a4fdfedca3ab164a5c9ea330ed28c9cb0d531477706373b<\/pre>\n
In the above output, we can see that the docker commit<\/code> command returned a sha256<\/code> hash. Seeing this hash indicates that our docker commit<\/code> command was successful.<\/p>\n
Let\u2019s double-check that our image was in fact created using the docker images<\/code> command.<\/p>\n
$ docker images testredis:example  \r\nREPOSITORY          TAG                 IMAGE ID            CREATED             SIZE  \r\ntestredis           example             6f68e12ee787        10 hours ago        183MB<\/pre>\n
With the above, we can see our testredis<\/code> image is in fact created.<\/p>\n
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Seeing the Differences<\/h2>\n
With our new container image saved, let\u2019s go ahead and see how well our docker commit<\/code> worked. We can do this by issuing the same grep<\/code> command via a docker run<\/code> execution.<\/p>\n
First, let\u2019s verify that our same base redis<\/code> container doesn\u2019t have the example<\/code> user.<\/p>\n
$ docker run redis grep example \/etc\/passwd<\/pre>\n
From the above, we can see that the example<\/code> user doesn\u2019t exist within our base redis<\/code> image. This might be a bit confusing at first, but once we think about how Docker works, it makes complete sense.<\/p>\n
Earlier when we logged into our upbeat_panini<\/code> container, we added the example<\/code> user. When we did this, we only added that user to the running container. Any changes we make to a running container has no effect on the original image. This is essentially the stateless nature of Docker containers.<\/p>\n
While our base redis<\/code> image doesn\u2019t have our example user, what about testredis:example<\/code>?<\/p>\n
$ docker run testredis:example grep example \/etc\/passwd  \r\nexample:x:1000:999::\/home\/example:\/bin\/sh<\/pre>\n
As expected, our new testredis:example<\/code> image does include an example<\/code> user. From here, we can use this image to create new containers or push it to a registry such as DockerHub.<\/p>\n
Summary<\/h2>\n
In today\u2019s article, we explored a way to make changes to Docker images without a Dockerfile<\/code>. Learning about the docker commit<\/code> functionality is interesting; in this author\u2019s humble opinion, docker commit<\/code> should be used sparingly.<\/p>\n
In the argument of using docker commit<\/code> versus a Dockerfile<\/code>, I personally believe that the Dockerfile<\/code> method is more future-proof. A Dockerfile<\/code> has the distinct advantage of being text, meaning it can be added to source control such as Git. This is in addition to being used to build a image and having that image pushed to a registry.<\/p>\n
Do you have another opinion or a use case that a Dockerfile<\/code> doesn\u2019t fit but docker commit<\/code> does? Add your opinion in the comments below.<\/p>\n
\n\n\n\n
Published on Web Code Geeks with permission by Benjamin Cane, partner at our WCG program<\/a>. See the original article here: Using Docker Commit to Create and Change an Image<\/a><\/p>\n
Opinions expressed by Web Code Geeks contributors are their own.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
The Dockerfile is one of the key features to Docker\u2019s success. The ability to build a new container image from a simple text file changed the technology game. When it comes to modifying a Docker image, our first thought is modifying the underlying Dockerfile. In today\u2019s article, I\u2019m going to show you another way to …<\/p>\n","protected":false},"author":158,"featured_media":10356,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[217],"class_list":["post-19245","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-devops","tag-docker"],"yoast_head":"\nUsing Docker Commit to Create and Change an Image - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"The Dockerfile is one of the key features to Docker\u2019s success. 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