this post was submitted on 01 Jul 2024
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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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Question if I update my server and it has the new SSH (patched) package. Is that enough or do I have to restart the server as well? How can I check if the old SSH is in use currently?
Some package managers have a command to see if anything is in need of restart. Zypper has ps -s for example. I'd restart to be sure though.
My server tells me a restart would be required because of:
Does that have anything to do with the SSH package?
No - it's the kernel image - the actual operating system, rather than a service that runs on top of it.
If you just want to restart your ssh service after updating the packages, then "systemctl restart sshd" is all that's needed, although you should probably reboot whenever the package manager suggests as a general good habit.