Linux UpSkill Challenge Day 1 - Get to know your server

• https://linuxupskillchallenge.org/01/

# basic system information
lsb_release -a
uname -a
uptime
whoami
who
w
 
# hardware information
lshw # doesn't work
lscpu
lsblk
lspci
lsusb # doesn't work on vultr server
 
# memory usage
free -h
vmstat
vmstat -SM 45 10
top
htop
 
# disk usage
df -h
du -h
 
# internet
ip a
netstat
sudo iftop -i eth0 # doesn't work on vultr

Further reading

• https://www.oracle.com/technical-resources/articles/it-infrastructure/dev-oom-killer.html
• https://help.ubuntu.com/community/SwapFaq
  • cat /proc/sys/vm/swappiness default is 60
  • sudo sysctl vm.swappiness={0-100}
• https://wiki.archlinux.org/title/Swap
• https://www.linux.com/news/all-about-linux-swap-space/
• https://www.cyberciti.biz/tips/how-do-i-find-out-linux-cpu-utilization.html
  • ps -eo pcpu,pid,user,args | sort -k 1 -r | head -n 10
• load average: number of processes waiting on the CPU
  • last 3 numbers from uptime command
  • 0.00 0.00 0.00
  • first number: past minute
  • second number: past 4 minutes
  • third number: past 15 minutes

EOF