A Step-by-Step Guide to Switch from Rootful Docker to Rootless Docker in Debian and Ubuntu
“Docker is a fantastic tool that lets you run applications in neat, isolated boxes called containers. This makes developing and shipping software much faster and more consistent. But there's a small catch you should know about. By default, Docker often runs with 'root' privileges, the highest level of access on a Linux system. This can be a security risk. Thankfully, there's a much safer way: Rootless Docker. This guide will walk you through everything you need to know about rootless Docker migration.”
Rootless mode looks pretty interesting but it does have a few known limitations that one needs to consider before diving in:
* Networking is different: The IP address of a container is not reachable from the host. You should always use port mapping (e.g., docker run -p 8080:80) to access services running in a container. Also, features like --net=host are namespaced, meaning they won't use the host's actual network directly.
* Privileged Ports: You can't map to ports below 1024 (like port 80) by default. You can either use a higher port (like 8080) or change system settings to allow it.
* Resource Limits: Limiting container resources like CPU or memory requires your system to use cgroup v2. If not, these flags will be ignored.
It is good though that the linked post also dives into various of these issues as well.
See
How To Migrate To Rootless Docker In Debian And Ubuntu Linux - OSTechNix
Learn how to migrate Rootful Docker setup to Rootless Docker in Debian and Ubuntu Linux step-by-step. Make your containers more secure!
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