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Practical guides, infrastructure notes, and lessons for running your corner of the internet.
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18 articles-
DNSSEC During a Domain Migration: A Practical Coordination Checklist
DNSSEC links parent and child DNS data. A provider migration must preserve or deliberately transition that chain of trust.
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SSH Key Rotation for a Small Team: Inventory, Replace, Verify, Revoke
Give each person and automation job a traceable credential, then rotate access without losing the ability to administer the server.
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Webhook Endpoint Security for a VPS-Hosted Application
A webhook is an untrusted inbound request until verified. Design signature checks, durable processing, and retries together.
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Monitor TLS Certificate Renewal Beyond the Scheduled Job
A renewal job can succeed while the public service keeps presenting an old certificate. Verify issuance, deployment, and the external handshake.
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Trusted Proxy Headers: Preserve Client IPs Without Trusting Spoofed Values
Forwarded headers are trustworthy only when a known proxy controls them. Map the request path before using them for security decisions.
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CAA Records Explained: Avoid Certificate Issuance Surprises
A CAA record is a certificate issuance policy. Inventory it alongside your certificate client before moving a site or changing authorities.
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Inbound vs Outbound Firewall Rules for a VPS Application
Inbound rules govern who reaches your services. Outbound policy needs a dependency inventory so routine jobs and updates keep working.
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Secure Session Cookies for a VPS-Hosted Web Application
Cookie flags are only part of session security. Scope the cookie carefully and verify how sessions are created, rotated, and invalidated.
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Recover from an SSH Lockout Without Erasing Your Security Policy
Use the recovery console to inspect the failed layer, preserve existing access rules, and verify a fresh connection after a narrow correction.
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How to Audit the Ports Exposed by Your Own VPS
Compare what is listening, what is permitted, and what is reachable. Those three inventories catch different exposure mistakes.
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CORS for Self-Hosted APIs: Allow the Right Browser Origins
CORS governs browser access to cross-origin responses. Keep its allowlist precise while retaining server-side authentication and authorization.
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How to Design a VPS Firewall Policy You Can Maintain
Start from required connections, give every rule an owner, and verify both allowed traffic and traffic that should stay blocked.
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