HTTP Expert

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  • Compare incus and libvirt for virtualization

    Here’s a detailed comparison of **Incus** and **libvirt**, focusing on their architecture, use cases, feature sets, and management models.

    October 27, 2025
  • What are the technical requirements for storing personal data as a company in European Union?

    The EU does not give a single, prescriptive “tech checklist.” Under the GDPR you must implement appropriate technical and organizational measures proportional to the risks to people. Below is a practical, controller/processor-ready set of requirements and controls mapped to GDPR expectations. This is general guidance, not legal advice.

    October 24, 2025
  • Public-key algorithms used in ssh

    SSH uses public-key cryptography to authenticate clients and servers, and the key type determines how keys are generated, stored, and signed. The main types in use today are: – Ed25519 (ssh-ed25519): fast, small keys; widely recommended for new keys. – Ed448 (ssh-ed448): higher security margin; less common. – ECDSA (ecdsa-sha2-nistp256 / 384 / 521): on…

    October 18, 2025
  • Ready-to-use evidence checklist tailored for SAQ‑A to attach with submission?

    Having a ready‑to‑use evidence checklist will make your SAQ‑A submission clean and defensible if your acquirer or payment processor asks for supporting materials. Below is a practical, SAQ‑A‑specific evidence checklist, tailored for merchants who fully outsource payment processing (e.g., redirect or hosted payment page). ✅ SAQ‑A Evidence Checklist 1. Scope & Environment Documentation Evidence Type…

    October 8, 2025
  • What are the most common SAQ‑A mistakes newcomers make, and how can I avoid them in my submission?

    This is where many first‑time PCI DSS filers stumble. Even though SAQ‑A looks simple (just a few pages), it’s still a legal attestation of compliance, and a small mistake can cause delays, compliance holds, or even liability issues. Here’s a breakdown of the most common SAQ‑A mistakes beginners make — and, more importantly, how to…

    October 8, 2025
  • How can I prepare Self‑Assessment Questionnaire (SAQ‑A)?

    October 8, 2025
  • Do ecommerce websites that integrate card payment require PCI-DSS certification?

    October 8, 2025
  • Sudoers file explained

    September 30, 2025
  • Persistent tmux sessions

    How to start a tmux session after login in a server using ssh, so that if the connection is lost, when I login back, I can go back to the same tmux session. Short answer (manual): Long answer (auto-resume optional): Snippets for bash, zsh and fish with tmux to start only sometimes

    September 16, 2025
  • Real client ip for Magento 2

    How I made Magento 2 see the real client IP behind HAProxy + Varnish + Nginx (with Cloudflare) If you run Magento 2 behind multiple layers, it’s common to lose the original client IP and end up with your proxy or load balancer address everywhere (logs, admin actions, rate-limiters, captchas). Here’s the setup that finally…

    August 29, 2025
  • MySQL Performance for Beginners: Right-size InnoDB Cache and Manage Binary Logging

    If your MySQL server feels slow, chances are your hot data or indexes don’t fit in memory, or your logging is forcing too many disk syncs. This beginner-friendly guide shows how to size InnoDB’s cache based on what you actually read, which other caches matter, and how binary logging affects performance. 1) Right-size the InnoDB…

    August 22, 2025
  • Self-generated certificates

    What they are, how mTLS works, how to build them with easy-rsa, and how to store them safely with git-crypt. Certificates, CA certificates, and private keys Notes: Server vs client certificates and how mTLS works Operational considerations: Generating and maintaining certificates with easy-rsa easy-rsa is a thin wrapper around OpenSSL that maintains a PKI directory…

    August 21, 2025
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HTTP Expert

Technical blog about development, administration and technical issues of online services