Configuring which hosts are trusted to send emails for any domain using SPF.
Connecting wired servers, through a switch, to an ubuntu server with a wireless card.
Using the CLI on Ubuntu Server to connect a to a WPA wireless network.
Launching chrome on a remote Ubuntu server using a local X11 graphics server
Sending cron-scheduled ping failure alerts using a bash script
Deploy and configure Postfix as a local send-only mail server.
How I moved my main domain from GoDaddy to Cloudflare, making life easier.