Small Systems Notebook Working notes on running small web services without drama. https://cedar.sanriodevgroup.org/ 2024-02-02T12:00:00Z Small Systems Notebook Reading a handshake tracehttps://cedar.sanriodevgroup.org/posts/reading-a-handshake-trace/2024-01-06T16:00:00Z2024-02-02T16:00:00ZWhat each message in a TLS 1.3 handshake is for, in plain words. Choosing DNS TTLshttps://cedar.sanriodevgroup.org/posts/choosing-dns-ttls/2023-11-27T07:00:00Z2024-01-04T07:00:00ZFive minutes before a move, a day when nothing is planned. Cache headers that age wellhttps://cedar.sanriodevgroup.org/posts/cache-headers-that-age-well/2023-10-17T15:00:00Z2023-10-17T15:00:00ZLong-lived assets, short-lived pages, and the one header that makes both safe. Log rotation without surpriseshttps://cedar.sanriodevgroup.org/posts/log-rotation-without-surprises/2023-08-24T15:00:00Z2023-08-24T15:00:00ZSize limits, copytruncate, and why the daemon should be told. Health checks that tell the truthhttps://cedar.sanriodevgroup.org/notes/health-checks-that-tell-the-truth/2023-07-06T18:00:00Z2023-07-06T18:00:00ZA health endpoint that only proves the process is alive is a liveness check. Readiness should exercise what the service needs to do its job, cheaply, and fail when that is not possible. Timeouts and budgetshttps://cedar.sanriodevgroup.org/notes/timeouts-and-budgets/2023-06-02T22:00:00Z2023-06-02T22:00:00ZEvery network call gets a timeout, and the timeouts of a request add up to a budget that is smaller than the patience of whoever is waiting. A page that calls two services with ten-second timeouts eac