Sujet : kernel
-
Checking whether a Linux host needs a reboot or a service restart after updates
Debian and Ubuntu mark a pending reboot with the plain file /var/run/reboot-required, while RHEL-family systems require comparing the running kernel to the newest installed one or running a needs-restarting-style check; neither family tells you this automatically at the shell prompt.
-
Managing installed kernels on Debian and Ubuntu: cleanup, /boot space, HWE and Livepatch
Old kernel packages accumulate in /boot until apt autoremove clears them; Ubuntu additionally offers a rolling Hardware Enablement (HWE) kernel on LTS releases and Canonical's Livepatch service for applying kernel security fixes without an immediate reboot — both Ubuntu-specific, with no Debian equivalent.
-
Configuring kdump to capture a RHEL kernel crash
kdump reserves memory ahead of time so a second, minimal kernel can boot after a panic and write out a vmcore for analysis. This methodology covers reserving that memory, enabling the service, and why deliberately testing it takes down the host — schedule the test accordingly.
-
Setting Linux kernel parameters with sysctl: runtime changes versus /etc/sysctl.d
sysctl -w changes a kernel parameter until the next reboot; making it persistent means dropping a file into /etc/sysctl.d/ and understanding the load order across /usr/lib, /etc and /run. sysctl --system applies every configured file and reports which one wins on a conflict.
Lisible par machine : JSON