What are health checks in Docker Compose?

What are health checks in Docker Compose?

Health checks in Docker Compose are used to determine if a service is running correctly. They periodically check the status of a container.

How do I define a health check in my Docker Compose file?

You can define a health check in your Docker Compose file using the 'healthcheck' key, specifying the test command and interval.

Can you give me an example of a health check configuration?

Sure! Here's an example:

services:
  web:
    image: my-web-app
    healthcheck:
      test: [ 'CMD', 'curl', '-f', 'http://localhost/']
      interval: 30s
      timeout: 10s
      retries: 3

What happens if a health check fails?

If a health check fails, Docker will mark the container as unhealthy, and you can configure your application to respond accordingly.