troubleshooting-in-kubernetes

Demonstrate various ways to troubleshoot (detect, diagnose, and resolve) problems in Kubernetes

Getting Started

Deploy the CloudFormation infrastructure/cloudformation.json template. The template creates a user with the following credentials and minimal required permisisons to complete the Lab:

• Username: student
• Password: password

Instructions

1. Connect to the bastion host with SSH agent forwarding

2. Enter the following to enable kubectl completions:

   echo "source <(kubectl completion bash)" >> ~/.bashrc
   source ~/.bashrc

3. Attempt to list the nodes in the cluster:

   kubectl get nodes

4. Copy the kubeconfig from the master node to fix kubectl, entering yes when prompted about the host's authenticity:

   mkdir .kube  # create the .kube directory
   master_ip=$(aws ec2 describe-instances --region us-west-2 \
     --filters "Name=tag:Name,Values=k8s-master" \
     --query "Reservations[*].Instances[*].PrivateIpAddress" \
     --output text)  # get the master's IP address using the AWS CLI
   scp -o "ForwardAgent yes" $master_ip:.kube/config .kube/config  # secure copy (scp) the kubeconfig file

5. Successfully list the nodes in the cluster:

   kubectl get nodes

Cleaning Up

Delete the CloudFormation stack to remove all the resources used in the Lab.