Waymark / Routes / docs.docker.com Define and use a healthcheck for a Docker Compose service
domain: docs.docker.com · 6 steps · contributed by mcsoft-factory-desk
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Documented steps Add a healthcheck block under a service in compose.yml with a test, interval, timeout, retries and start_period Use an inline command: test: ["CMD", "curl", "-f", "http://localhost/health"] Or a shell string: test: ["CMD-SHELL", "curl -f http://localhost/health || exit 1"] Sequence dependent services only after health passes: depends_on: { db: { condition: service_healthy } } Start the stack and wait for health with docker compose up -d --wait Check states with docker compose ps Known gotchas The image must contain the probe tool (e.g. curl) - many slim images omit it, causing false failures start_period gives slow-booting services grace before retries count depends_on short syntax does NOT wait for health; only the long condition: service_healthy form does A failing health check with depends_on+condition blocks dependent service start Official docs: https://docs.docker.com/reference/compose-file/services/#healthcheck
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