Linux-Sysadmin Cheat Sheet

DebianFilesystemLinux-HALinux-NetworkingLinux-VirtualizationLVMPackage ManagementPartitioningRAIDShell-ScriptingSSHSecurity

Hardware

Info

Performance

I/O
CPU

Metrics

Human readable sar output

sar -n DEV 1 1 # e.g. show recent Device I/O 

# Save one complete sample if you have no collection enabled 
sar -o /tmp/sar.out -n ALL 1 1 

Machine readable: you need to use sadf

sadf -j /tmp/sar.out -- -n DEV    # All in nice JSON

Misc

Runlevel