this post was submitted on 10 Jun 2023
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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It is the application Docker that is not secure. Containers are. In fact Docker runs a daemon as root to wich you communicate from a client. This is what makes it less secure; running under root power. It also has a few shortcomings of privileged containers. This can be easily solved by using podman and SELinux. If you can manage to run Docker rootless, then you are magnitudes higher in security.
There can also be old images with e.g. old openssl versions being used. Its not a concern if they are updated frequently, but still manual.
This is a problem of the containerized program and the image itself. This problem affect, containers, VM, and baremetal aswel.
I agree. But imo these usecases are more known and mature in traditional setups, we could
apt updateand restart a systemd service and its done.Its not so obvious and there are no mechanisms for containers/images.
(I am not into devops/sysadmin, so this might also be my lack of exposure)
Most often, images are updated automatically and are managed by the developers themselves so images are usually up to date. If you don't know how to build images, it may be difficult for you to update the containerized software before the vendor does. But this situation is infrequent.
Many projects just pull in a bunch of images from wherever and never update them. Especially if it's that one obscure image that happens to package this over obscure app you absolutely need.