Health Checks and Self-Healing

Container Health Checks

Why Health Checks?

Container running does not mean application is healthy:

Health Check in Dockerfile

Health Check Options

• --interval=30s: Run check every 30 seconds
• --timeout=3s: Check must complete in 3 seconds
• --start-period=40s: Grace period before checks start
• --retries=3: Mark unhealthy after 3 consecutive failures

Health Check Commands

Health Check Script Example