![]() ![]() Where NEW_IMAGE_NAME is the new name for the image. In order to see if this worked, deploy a new container with the new image, like so: You don’t have to use the full container ID, just the first four characters will suffice. If you’re unsure of what the ID is, issue the command docker ps -a. Where CONTAINER_ID is the ID of the container for which you changed the root password, and NEW_IMAGE_NAME is a unique name for the new image. To commit our change issue the command:ĭocker commit CONTAINER_ID NEW_IMAGE_NAME Committing the changeīack at your regular bash prompt (outside of the container), you have to commit the change to the image (otherwise you’ll just deploy more containers with the same lack of password). ![]() When that completes, you can issue the cat /etc/shadow | grep root command to see the root user now has a hashed password. When prompted, type and verify a new password for the root user. You should see the root user doesn’t include a hashed password ( Figure A). When that command completes (it might have to first pull down the CentOS image), you’ll find yourself at the bash prompt for the root user. The first thing to do is deploy the CentOS container, based on the official image. I will assume you already have Docker up and running. You should be able to do this with any of the official Linux distribution images from DockerHub (or any you created on your own). I’ll demonstrate with the official CentOS image. To that end, I want to show you how you can change the root password on an running container and then commit that change the image. SEE: Windows 10 security: A guide for business leaders (TechRepublic Premium) However, if you plan on doing a lot of in-house development, you certainly don’t want to base those containers on images with weak security. It can be tricky, because some images depend on a set password for the root user. While this may not be the best solution for every container you work with, it is possible to change a root user password on an image. ![]() New Malware Targets 97 Browser Variants, 76 Crypto Wallets & 19 Password ManagersĪlthough this isn’t typical, you might want your containers to deploy with a heightened sense of security. How Generative AI is a Game Changer for Cloud Security Must-read security coverageĨ Best Penetration Testing Tools and Software for 2023Ħ Best Cybersecurity Certifications of 2023 This could have easily led to serious security issues on any container you might have deployed with that pulled image. You’ve probably already read that some Docker images were released with null passwords. If you deploy Docker containers based on an official imagine, you might want to set a root password for heightened security. How to change a root password in a Docker image ![]()
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