Troubleshooting
Master the art of diagnosing and fixing Kubernetes issues. Learn systematic troubleshooting approaches and common problem patterns.
Prerequisites
What You Should Know Before Starting
Essential knowledge for effective troubleshooting
- Understanding of all CKA core concepts
- Experience with kubectl commands
- Basic knowledge of Linux troubleshooting
- Understanding of container runtime concepts
Learning Topics
Pod Troubleshooting
Diagnosing and fixing pod-related issues
Learning Objectives:
- •Pod Status Analysis
- •Container Logs
- •Resource Constraints
- •Image Pull Issues
- •Startup Probes
Network Troubleshooting
Resolving connectivity and networking problems
Learning Objectives:
- •Service Connectivity
- •DNS Resolution
- •Network Policies
- •Ingress Issues
- •Load Balancer Problems
Storage Troubleshooting
Fixing persistent volume and storage issues
Learning Objectives:
- •Volume Mount Issues
- •Storage Class Problems
- •PVC Binding
- •Snapshot Failures
- •Capacity Issues
Cluster Diagnostics
Systematic cluster health and performance analysis
Learning Objectives:
- •Node Status
- •API Server Issues
- •etcd Problems
- •Controller Failures
- •Scheduler Issues
Troubleshooting Methodology
Systematic Approach to Problem Solving
Follow these steps to efficiently diagnose and resolve issues
Step-by-Step Process:
- 1Check pod status and events
- 2Examine container logs
- 3Verify resource constraints
- 4Test network connectivity
- 5Validate configuration files
- 6Check cluster component health
Common Tools:
- kubectl commands
- Log analysis
- Event monitoring
- Health checks
Key Concepts
Diagnostic Commands
Essential kubectl commands for gathering information and diagnosing issues.
- • kubectl get, describe, logs
- • kubectl top, events
- • kubectl debug, exec
- • kubectl auth can-i
Log Analysis
Understanding and analyzing logs from various Kubernetes components.
- • Container application logs
- • Kubernetes system logs
- • Audit logs and events
- • Log aggregation tools
Common Issues
Frequently encountered problems and their typical solutions.
- • Image pull failures
- • Resource constraints
- • Network connectivity issues
- • Storage mount problems
Cluster Health
Monitoring and maintaining overall cluster health and performance.
- • Node status monitoring
- • API server health
- • etcd cluster status
- • Controller health checks
Practice Scenarios
Pod Won't Start
Diagnose why a pod is stuck in Pending or CrashLoopBackOff state.
Service Not Accessible
Troubleshoot why a service is not reachable from outside the cluster.
Cluster Component Failure
Investigate and resolve issues with core cluster components.
CKA Journey Complete!
Congratulations! You've covered all the essential topics for the CKA certification. You're now ready to take the exam and become a Certified Kubernetes Administrator.