Kubernetes Dashboard

This image shows the Kubernetes Dashboard with deployed microservices.

Kubernetes Dashboard Documentation

K8s Dashboard Documentation

Helm Installation

Helm Installation Guide

Dashboard Installation

helm upgrade --install kubernetes-dashboard kubernetes-dashboard/kubernetes-dashboard --create-namespace --namespace kubernetes-dashboard

Port Forwarding for Dashboard Access

kubectl -n kubernetes-dashboard port-forward svc/kubernetes-dashboard-kong-proxy 8443:443

Create Dashboard Admin User

kubectl apply -f dashboard-adminuser.yaml

Role Binding for Admin User

kubectl apply -f dashboard-rolebinding.yaml

Create Secret for Admin User

kubectl apply -f secret.yml

Create Token for Admin User

kubectl -n kubernetes-dashboard create token admin-user

Create Bearer Token for Access by a Single Token

kubectl get secret admin-user -n kubernetes-dashboard -o jsonpath="{.data.token}" | base64 -d

Kubernetes Commands

kubectl get deployments

kubectl get services

kubectl get replicaset

kubectl get pods

kubectl describe pod <pod-name>

kubectl logs <pod-name>

kubectl get pods -o wide

Create Docker Images from the Git Project

Follow the steps mentioned in this link repository to create Docker images for this Kubernetes project from the Git repository: microservice-architecture-java.

Create Environment Variable in Kubernetes Cluster

kubectl apply -f configmaps.yml

Order of Deployment

To ensure services are deployed in a structured manner, the following order should be followed:

1. Keycloak - Identity and access management service.
2. ConfigMaps - Configuration for environment variables and other settings.
3. ConfigServer - Centralized configuration management service.
4. EurekaServer - Service registry for microservices.
5. accountsdb - Database for microservices.
6. cardsdb - Database for microservices.
7. loandb - Database for microservices.
8. Accounts - Microservice handling account-related operations.
9. Loan - Microservice managing loan-related functionalities.
10. Cards - Microservice handling card-related processes.
11. Gateway - API Gateway for routing requests to services.

Deploying Applications in Kubernetes

To deploy microservices and applications in a Kubernetes cluster, the appropriate YAML manifest files should be created and applied. Each microservice and configuration must be properly defined before deployment.

Deployment Commands

kubectl apply -f keycloak.yml

kubectl apply -f configserver.yml

kubectl apply -f eurekaserver.yml

kubectl apply -f accountsdb.yml

kubectl apply -f cardsdb.yml

kubectl apply -f loandb.yml

kubectl apply -f accounts.yml

kubectl apply -f loan.yml

kubectl apply -f cards.yml

kubectl apply -f gateway.yml

Scale Deployments

kubectl scale deployment accounts-deployment --replicas=2

Retrieves detailed information about the specified Pod and Displays its status, events, conditions, logs, and resource usage.

kubectl describe pod <pod-name>

Updates the container image and Triggers a rolling update

kubectl set image deployment/<deployment-name> <container-name>=<new-image-name>:<new-image-tag>

Example:

kubectl set image deployment gatewayserver-deployment gatewayserver=akash9229/gatewayserver:v2

Rolling Update

kubectl rollout restart deployment <deployment-name>

Check if the new image is being used:

kubectl get deployment gatewayserver-deployment -o wide

Retrieves and displays Kubernetes events in the default namespace, sorted by creation time (oldest first), helping debug issues and track cluster activities and events.

kubectl get events -n default --sort-by=.metadata.creationTimestamp

Delete a Pod

kubectl delete pod <pod-name>

Delete a Deployment

kubectl delete deployment <deployment-name>

Delete a Service

kubectl delete service <service-name>

View Logs for a Pod Continuously

kubectl logs -f <pod-name>

View Resource Utilization of Pods

kubectl top pod

View Resource Utilization of Nodes

kubectl top node

Check Running Namespaces

kubectl get namespaces

Get All Resources in a Namespace

kubectl get all -n <namespace>

Apply All Configurations in a Directory

kubectl apply -f ./k8s/

Troubleshooting: Debug a Failing Pod

kubectl exec -it <pod-name> -- /bin/sh

Restart a Pod

kubectl delete pod <pod-name> --grace-period=0 --force

Check the Current Context

kubectl config current-context

Switch Kubernetes Contexts

kubectl config use-context <context-name>

List Available Kubernetes Contexts

kubectl config get-contexts

Create a New Kubernetes Context

kubectl config set-context <context-name> --cluster=<cluster-name> --user=<user-name> --namespace=<namespace-name>

Delete a Kubernetes Context

kubectl config delete-context <context-name>

Delete All Kubernetes Contexts

kubectl config delete-context <context-name>

List All Kubernetes Contexts

kubectl config get-contexts

Create a New Kubernetes Cluster

kubectl config set-cluster <cluster-name> --server=<cluster-server> --certificate-authority=<path-to-ca-cert>