Advanced Linux Skill Sheet

quick sysadmin guide Linux tuning and best practices, cron, ttys systemd ( quick all useful / cheat memorize ) linux networking ( Ubuntu/RHEL Server ) grub, mbr, efi, bios, etc Kerberos / AD / PAM iostat, sar, vmstat, redirects, xargs lsof, fuser, ulimit, swap system calls, zombie, orphan procs, OOM lxd cgroups performance tuning performance monitoring

what is using most cpu? mem? io? disk?

cron log rotate

taskset numactl

/proc /sys

setfacl sticky bit suid/sgid

SELinux AppArmor

process group session

IPC Memory Management kernel stuff drivers / modules

proxies routing

iptables

ssl

lvm commands zfs commands

partitons fsck expand / shrink