Docker Compose Health Checks: Ensuring Service Availability in Production

Overview

A practical guide for docker compose health checks: ensuring service availability in production, covering production-ready configuration, common pitfalls, and verified best practices.

Prerequisites

• Ubuntu 22.04 or later (Debian 11/12 compatible)
• Root or sudo access
• SSH access to the server

Core Configuration

Start by checking your current state:

systemctl status
df -h
free -m
ss -tlnp

Step-by-Step Setup

# Create configuration directory
sudo mkdir -p /etc/docker/compose/health/checks/guide
sudo chmod 750 /etc/docker/compose/health/checks/guide

Verification

After any configuration change, verify immediately:

sudo systemctl restart relevant-service
sudo systemctl status relevant-service
journalctl -u relevant-service -n 20 --no-pager

Common Issues

• File permissions: Service users must be able to read their configuration files
• Port conflicts: Check with ss -tlnp | grep :PORT before binding
• Syntax errors: Use built-in config test commands (nginx -t, sshd -t)

Security Considerations

• Run services under dedicated non-root users
• Bind to localhost unless remote access is required
• Use TLS for any network-exposed endpoint
• Enable audit logging for sensitive operations

Monitoring

Set up basic monitoring with Prometheus and alert on service restarts, error rate spikes, and resource exhaustion. Production readiness means testing and iterating based on real-world behavior.