Server Administration Cheat Sheet

Commands to keep your Linux servers running smoothly.

Systemd and Services

Command	Description
`systemctl status nginx`	Check status of nginx.
`systemctl start/stop nginx`	Start or stop the service.
`systemctl enable nginx`	Enable service to start on boot.
`systemctl reload nginx`	Reload configuration without dropping connections.
`journalctl -u nginx`	View logs for nginx.

Command	Description
`top` or `htop`	Interactive process viewer.
`ps aux`	List all running processes.
`kill -15 1234`	Gracefully terminate PID 1234.
`kill -9 1234`	Forcefully kill PID 1234.
`nohup command &`	Run a command immune to hangups in the background.

Command	Description
`free -h`	View RAM usage.
`df -h`	View disk mount usage.
`du -sh *`	View size of files/folders in current directory.
`uptime`	View how long the system has been running and load average.

# Create a tarball
tar -czvf archive.tar.gz /path/to/dir

# Extract a tarball
tar -xzvf archive.tar.gz