What is Monitoring?
Monitoring is the practice of continuously observing systems,
applications, and infrastructure to detect issues before they
impact users.
Why Monitoring is Critical in DevOps
- Early detection of failures
- Reduced downtime
- Improved system reliability
- Better user experience
Types of Monitoring
- Infrastructure monitoring (CPU, memory, disk)
- Application monitoring (errors, latency)
- Log monitoring
- Network monitoring
Popular Monitoring Tools
- Prometheus
- Grafana
- Nagios
- ELK Stack (Elasticsearch, Logstash, Kibana)
What is Self-Healing?
Self-healing systems automatically detect failures
and recover without human intervention.
Self-Healing Examples
# Restart service if stopped
systemctl restart nginx
# Kubernetes auto-restarts failed pods
kubectl get pods
Self-Healing in DevOps
- Auto-restarting services
- Auto-scaling based on load
- Replacing failed nodes
- Automated rollback on failure
Best Practices
- Define meaningful alerts
- Avoid alert fatigue
- Log everything important
- Test recovery automation regularly
What You Learned
- Monitoring fundamentals
- Popular monitoring tools
- Self-healing concepts
- Real-world DevOps automation
← Back to Lesson 1: Introduction