Advanced Docker Compose: healthchecks, dependency conditions, and best practices

Short summary

A practical guide to advanced Docker Compose features including healthchecks, dependency conditions (service_started, service_healthy, service_completed_successfully), and best practices like pinning image tags and using start_period for slow-starting services. The article provides complete compose.yaml examples showing how to ensure a Postgres database is fully ready before an application boots, replacing fragile shell-script workarounds with native Compose capabilities.

• •Docker Compose healthchecks verify services are operational, not just running
• •depends_on conditions control startup order: service_healthy waits for healthcheck to pass
• •Best practices: pin image tags, use start_period for databases, escape variables with $$

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