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Server & Solana Infrastructure Blog
Guides, product updates and deep dives on high-performance infrastructure, low-latency networking and Solana hosting.
What Is apt in Linux? The Complete apt Guide
apt is Ubuntu's package manager. Learn what apt update and apt upgrade actually do, and how apt relates to apt-get under the hood.
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Linux Network Commands Cheat Sheet
The essential Linux networking commands: ip for addresses and routes, ss for sockets, plus ping, dig, and curl, with what each actually does.
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How to Install a .deb File on Ubuntu
Install a .deb file with apt install ./file.deb for automatic dependencies, or dpkg -i plus apt --fix-broken install when it isn't.
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How to Uninstall Packages in Ubuntu (apt & dpkg)
Remove a package with apt remove, purge its leftover config files with apt purge, and clean up unused dependencies with autoremove.
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How to Enable and Secure SSH on Ubuntu
Install openssh-server, allow it through ufw, and lock down root login and password auth once key-based access actually works.
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How to Change the Default SSH Port on Linux
Change SSH from port 22 to a custom port in sshd_config, open it in your firewall, and connect with the right flag afterward.
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How to Use rsync on Linux to Sync Local & Remote Directories
Copy folders with rsync locally, push or pull them over SSH, resume interrupted transfers, and turn a one-off copy into a true mirror with --delete.
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How to List Users in Linux (All Commands)
Every way to list users on a Linux system — all accounts, just human users, who's logged in right now, and the one command that shows all of it at once.
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How to Add a User to Sudoers in Ubuntu
Give a user sudo access on Ubuntu the safe way — the sudo group, a scoped sudoers.d file, and the gotchas (like the -a flag) that trip people up.
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