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2026-09-22
DNS (Domain Name System) — a distributed system that tells, by domain name, where a website is located, where to deliver mail, and who owns the domain. Each such response is stored in the domain zone as a record of a …
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Migrating a database to a cloud provider rarely boils down to dumping and loading. If the database is large and downtime must be measured in minutes, you need a service that first copies the data, then catches up the …
Read more2026-09-22
Let’s Encrypt has made free HTTPS certificates the norm: they are issued automatically via the ACME protocol, and the client on the server renews them before expiration. But Let’s Encrypt is not the only free …
Read more2026-09-22
Where to store a company’s files, databases, and backups — on your own equipment or in a provider’s cloud — is not a technical question, but an economic and legal one. The answer determines expenses for several years …
Read more2026-09-22
S3 (Simple Storage Service) — Amazon’s object storage service, launched in 2006. Its API has over time become an industry standard: today “S3” often refers not to a specific Amazon service but to the protocol …
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AWS Cognito and Microsoft Entra ID are the identity services of the two largest cloud platforms. Both handle user sign-in and token issuance, but are aimed at different scenarios: Cognito is for users of your …
Read more2026-09-22
OpenSearch — an open data search and analytics system most often used for centralized log storage. It is a fork of Elasticsearch and Kibana: in 2021, after Elastic changed the license to SSPL and the Elastic License, …
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