Preparing a server migration
A migration is a coordinated application and data change. Moving files alone may miss databases, scheduled tasks, certificates, runtime versions or external integrations. Prepare a tested d…
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DNS changes during a migration
DNS changes are not seen everywhere at exactly the same moment. Authoritative records, resolver caches and application caches can affect what a user reaches. Plan a period in which the old …
Reporting a slow application or server
Describe the user-visible symptom before assuming that more CPU or RAM is the solution. Slow requests may originate in the application, database, storage, external API or network. Useful me…
Planning patches, restarts and maintenance windows
Maintenance should have an owner, a defined objective and a way to decide whether it succeeded. A package update, operating-system upgrade and application migration carry different compatib…
Choosing useful monitoring and alerts
Monitoring is useful when an alert identifies an action someone can take. A running server does not necessarily mean that logins, payments or other important application functions work. Agr…
