When working with Docker, everything is centered around the images that are being used. When an image is used to deploy a container, the container will continue to run the version of the image. That was used to deploy it, even if a newer release is available. Docker images contained within a container that is currently operating do not automatically update. After an image has been used to make a container, the container will continue to use that version of the image even after new releases have been made available.
It is vital to employ alternative methods in order to keep the images within launched containers up to date and maximize the performance of your applications. This is because images within launched containers cannot automatically update themselves. If you want to know more about docker and commands that can help you with different operations in docker, you can get the best docker consulting service with SupportFly. Through this blog, we are going to provide you with a step-by-step guide on how to update Docker images. Prior to that we are going to discuss why it is important to update Docker images.
Table of Contents
Why is it Important to update Docker images
It is highly suggested that you utilize the latest image version when running Docker containers unless you have a compelling reason to use an earlier version of the software.
Keeping them up to date is important for a number of reasons, including the following:
- Images that have been recently updated typically include bug fixes and patch upgrades that can make your apps more secure.
- The performance of your applications may be enhanced as a result of upgraded images, which frequently include new or better performance.
- Images that have been updated typically remove outdated characteristics that, if left intact, can disrupt the seamless compatibility of the image with other devices or apps.
How to update Docker image to the latest version?
To update Docker image, first utilize the official registry offered by Docker Hub which will help you to get your images up to speed with the most recent version of Docker. In order to complete this purpose, first log in to the Docker Hub registry and get the image of the version you want to use or the latest version image. Check out the instructions that have been provided for the demonstration.
Step 1: Log in to Docker Hub
In order to log in to Docker, you must first use your preferred Windows terminal and type in the “docker login” command. You will be prompted by this command to provide the username and password associated with your Docker Hub account:
> docker login
Also Read: Our blog post on How to kill docker container
Step 2: Pull the Image With the Version
Next, get an image from Docker Hub using whichever version you choose. For example, we used the given command to pull “mysql:5.7”:
> docker pull mysql:5.7
To be sure, make a list of the pictures and see if the image has been pulled:
> docker images
Also Check: Our blog post on docker restart container
Step 3: Inspect Image
Check the image to see which version of the image is currently being used. This can be done by using the “docker inspect” command with the image ID:
> docker inspect be16cf2d832a
You can see that we are using the “5.7” version of the “mysql” image from the output:
Check Out: Our blog post on Jenkins Docker Compose
Step 4: Update Docker Image Version to the Latest
Pull the image with the “image-name>:latest” syntax as shown in the following example to bring it up to the most recent version:
> docker pull mysql:latest
Make a new list of the images and see if the most recent one has been pulled. The “Tag” column displays the image version’s associated information as follows:
> docker images
On the other hand, you are able to inspect the image by using its ID and check to see if it has been updated to the most recent version or not:
> docker inspect 05b458cc32b9
As you can see in this example, the “8.0” version has been applied to all of our images:
Users are able to go to the Docker Hub repository from within their browsers, where they can also check out the images and versions that are currently available:
This is all you need to know to get the Docker files to the most recent version.
Conclusion
On the Docker Hub registry, there are thousands of images that have been published. Docker Hub’s official image registry provides users with simple and quick access to the images of all available versions. In order to get the image up to the latest version, you will first need to log in to your account on Docker Hub. Then, use the command “docker pull <image:latest>” to retrieve the most recent image. This article has provided instructions on how to update Docker image to the latest version. Follow the steps given above to update Docker image to the latest version. If you face any difficulty or have any queries, you can reach out to our support team by clicking here.
