Kernel Management

• See what CMD a system was booted with:

  root@mariadb:~# cat /proc/cmdline
  BOOT_IMAGE=/boot/vmlinuz-6.8.0-50-generic root=UUID=19c5ce25-a085-434c-8ae2-bbb8be11756d ro quiet splash
  

Configure kernel parameters

Persistent change:

Use the command:

sysctl -w <TUNABLE_CLASS>.<PARAMETER>=<TARGET_VALUE> >> /etc/sysctl.conf
sysctl -p

Non-persistent change:

Use the command:

sysctl <TUNABLE_CLASS>.<PARAMETER>=<TARGET_VALUE>

Kernel modules:

• Located at /lib/modules/$(uname -r)
• Modules utilities:
  • lsmod: List loaded modules.
  • modprobe: Load or unload modules, using a pre-built module database with dependency and location information.
  • depmod: Rebuild the module dependency database.
  • modinfo: Display information about a module.