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Servers, clouds and reliable infrastructure.
We examine the TLS auto-renewal chain: from launching the ACME client to the certificate on the CDN. The reader will receive a verifiable list of evidence and readiness criteria.
Converting 99.9%, 99.95%, and 99.99% into minutes, we examine service coverage, exclusions, and service credits to compare hosting plans by their terms rather than by the number of nines.
If new emails stop arriving, first check the bounce code returned to the sender and the mailbox quota. We examine a safe sequence of actions that avoids deleting necessary correspondence and accidentally changing DNS settings.
Paying the invoice is no longer sufficient for domain renewal: the administrator's data must undergo identification via ESIA. We examine what to verify before the renewal window opens and how to confirm the result.
We show how to calculate backup retention time based on detection delay, decision time for restoration, and snapshot interval—without guessing.
We explain why free gigabytes do not rule out file limits: where to check File Usage and inode, what to request from support, and when cleanup or a different plan is needed.
We analyze SPEED, PMEM, IO, IOPS, EP, and NPROC in CloudLinux: what data to request from support, how peaks differ from faults, and when upgrading a plan is truly justified.
On October 23, Yandex Cloud announced a new location for ru-central1-a resources. Access is being rolled out in stages; virtual machines and some databases remain stopped. We examine what to verify before restoring traffic.
On October 23, a network incident affected some Cloudflare customers in North America. The provider reported the issue was resolved. We explain who should check task queues and incomplete operations.
We examine a specific PHP-FPM pool during slowdowns: which metrics to compare, why an idle CPU doesn't rule out waiting, and what to do if the queue is empty. Includes a reproducible educational calculation.
CDN can accelerate images while barely affecting the wait for the first HTML. We examine how to distinguish edge node operations from the origin server, cache misses from a slow application, and network latency from rendering time.
Two NS records in domain settings may depend on a single platform, network, or control panel. We examine which failure points to check and how to accept a DNS scheme without experimenting on a live site.
The control panel, updates by request, and round-the-clock support leave various tasks for the website owner. A hypothetical failure helps test the limits of VPS maintenance even before choosing a service.
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