#docker

Articles tagged with #docker

Docker health checks that catch real problems, explained simply
A plain guide to Docker health checks for your app, Postgres (pg_isready) and Redis, and three mistakes that make a check pass when it shouldn't. Your app starts, tries to reach the database, and cras
Oct 19, 202611 min read2
Deploy a docker-compose.yml as-is: 8 platforms, which keys survive, and what web + Postgres + Redis costs
Originally published on the Hubfly blog. TL;DR What you get: which platforms take your docker-compose.yml without a rewrite, which Compose keys survive, and a monthly price for the same 3-service st
Oct 18, 202611 min read4
Canary releases with a weighted load balancer: 10% to v2, proven with 200 requests
TL;DR What you get: a canary release that sends exactly 1 in 10 requests to a new version, a 7-line script that proves the split, and a rollback that takes effect in under a second. Who it's for: an
Oct 18, 20269 min read
502 Bad Gateway in Docker? Bind to 0.0.0.0, not 127.0.0.1 (1-line fix)
Originally published on the Hubfly blog. TL;DR What you get: a 30-second check that tells you if a 502 is a bind-address bug, the one-line fix for 9 common servers, and 3 traps to avoid. Who it's f
Oct 16, 20268 min read1
Make your app wait for its migrations: a Compose migration job
Originally published on the Hubfly blog. TL;DR What you get: a 3-service Compose file (Postgres, a one-shot migration job, an API) where the API cannot start until the migration exits 0. Who it's f
Oct 16, 202611 min read3