Guides
Intermediate
Guides
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RAID levels explained: 0, 1, 5, 6 and 10
How each RAID level spreads data across disks, how many failures it survives, how much space you keep, and why RAID is still not…
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What is a reverse proxy?
A server that stands in front of your other servers, takes every request and decides who answers. What it does, when you need one,…
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How to back up a Linux server
Dump the databases, copy the files to another machine every night with rsync and cron, and prove the backup works by restoring it.
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How to turn on automatic security updates
Have the server install security patches by itself every day, on Ubuntu with unattended-upgrades and on RHEL-based systems with dnf-automatic.
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How to set up a firewall on Linux
Block everything except SSH and the web with UFW on Ubuntu or firewalld on RHEL-based systems, without locking yourself out.
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How to get a free SSL certificate with Let’s Encrypt
Issue a trusted HTTPS certificate in one command with Certbot, redirect HTTP to HTTPS, and make sure it renews by itself.
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How to install Nginx on Ubuntu
Install Nginx, serve your first site from its own folder, and learn the three commands you will use every time you change its configuration.
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How to migrate a cPanel account to another cPanel server
Three ways to move a whole cPanel account (files, databases, email and DNS zone) to a new server, with annotated WHM screenshots for each.
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How to migrate email to a new host
Copy mailboxes over IMAP, switch the MX records, and pick up the stragglers, without losing a single message.
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How to change hosts without downtime
Run the old and new servers side by side, switch DNS when the new one is proven, and keep the old one answering until…