VPS

VPS Management Rules

Choosing a VPS

• Match location to users — latency matters more than raw specs for user-facing apps
• ARM instances cost 20-40% less with equivalent performance for most workloads — check compatibility first
• Shared vCPU is fine for most apps — dedicated CPU only for sustained compute-heavy workloads
• Bandwidth overage fees can exceed server cost — check limits before choosing plan

Initial Setup Priority

• Update system packages immediately after first boot — fresh images are often months behind on security patches
• Create non-root user with sudo before disabling root — locking yourself out requires provider console access
• SSH key authentication before disabling password login — test the key works first
• Firewall rules before exposing services — default is often all ports open

SSH Hardening

• Change SSH port from 22 — reduces automated scanning noise by 99%
• Disable root login via SSH — force sudo for audit trail
• Disable password authentication — keys only, no exceptions
• Install fail2ban — bans IPs after failed attempts, essential for any public server

Firewall Basics

• Default deny incoming, allow outgoing — only open what you need
• Allow SSH (your custom port) before enabling firewall — or you're locked out
• HTTP/HTTPS (80/443) only if running web services
• Keep firewall rules minimal — every open port is attack surface

Resource Management

• Enable swap even with enough RAM — prevents OOM kills during traffic spikes
• Monitor disk usage — logs and Docker images fill disks silently
• Set up basic monitoring (uptime, disk, memory) — know when things break before users tell you
• Reboot periodically to apply kernel updates — unattended-upgrades doesn't cover everything

Backups and Snapshots

• Provider snapshots are not backups — they're tied to the provider, not portable
• Test restore process before you need it — untested backups are wishful thinking
• Automate backups — manual backups get forgotten
• Keep at least one backup offsite — provider outages take everything with them

Networking

• Static IP is usually default — but verify before relying on it for DNS
• IPv6 is free and increasingly expected — enable it unless you have specific reasons not to
• Private networking between VPS instances avoids public internet for internal traffic
• Document your IP addresses — easy to lose track with multiple servers

Cost Awareness

• Stopped instances still cost money for storage — delete unused servers
• Reserved instances save 30-50% for long-term use — commit if you're sure
• Bandwidth is often the surprise cost — especially for media-heavy apps
• Multiple small VPS often beats one large one — isolation and redundancy

Provider-Specific

• Hetzner, DigitalOcean, Linode, Vultr all work similarly — skills transfer between them
• Provider firewalls (security groups) act before OS firewall — configure both
• Provider console access works when SSH is broken — know how to access it
• Some providers charge for IPv4 addresses separately — check before assuming you have one

Common Mistakes

• Not updating for months — security vulnerabilities accumulate
• Running everything as root — no audit trail, maximum blast radius
• No firewall because "nobody knows my IP" — scanners find everything
• Oversizing from day one — start small, scale when needed
• Ignoring provider status pages — outages explain mysterious issues