k8s docean

kubectl version Print the client and server version information

kubectl version --client=true

Client version only (no server required).

shell linux: export KUBECONFIG=C:\Users\AdministradorCIFO\Desktop\k8s-1-4-4-do-0-fra1-1757308432-kubeconfig.yaml

power-shell windows: $Env:KUBECONFIG = "C:\Users\AdministradorCIFO\Desktop\k8s-1-4-4-do-0-fra1-1757308432-kubeconfig.yaml"

Organizing Cluster Access Using kubeconfig Files

kubectl get Display one or many resources

kubectl create Create a resource from a file or from stdin.

kubectl expose Take a replication controller, service, deployment or pod and expose it as a new Kubernetes Service

kubectl run Run a particular image on the cluster

kubectl set Set specific features on objects

kubectl config Config modifies kubeconfig files

This guide walks you through the process of deploying a Spring Boot application on Kubernetes.

We need this tools:

• Digital Ocean account

• kubectl

• doctl

• Domain with 2 endpoints (A records)

• React and Spring Boot projects

• mySQL or H2 database

• dockerhub with dockers

Step-by-step

1. Create Spring Boot docker and push to dockerhub

2. Create React docker and push to dockerhub

3. Domains: on Digital Ocean, NameCheap or AWS Route53

4. Configure env var to define endpoints in both projects

5. Create cluster on k8s Digital Ocean (minimum two nodes)

6. Connect/Manage cluster via kubectl (need connection file from Digital Ocean)

7. Connect/Manage cluster via doctl (need token from Digital Ocean)

8. Create k8s secrets (for mySQL)

9. Deploy mySQL on k8s on persistent Volume (k8s/mysqlbooks.yml)

   1. • kubectl apply -f k8s/mysql.yml

10. Deploy Spring Boot on K8s cluster (k8s/sprintbootbooks.yml)

    1. • kubectl apply -f k8s/sprintbootbooks.yml

11. Deploy React on K8s cluster (k8s/reactbooks.yml)

    1. • kubectl apply -f k8s/reactbooks.yml

12. Install k8s NGinx Ingress Controller (loadbalancer) or create it on Digital Ocean

    1. • kubectl apply -f deploy.yaml

13. Add domain to digital Ocean or create it on Digital Ocean

14. Create DNS/A records for React/Spring Boot

15. Publish/Expose React/SpringBoot ingress-nginx.yml

    1. • kubectl apply -f k8s/ingress-nginx.yml

16. Install, Create and Configure Cert-Manger, ClusterIssuer, Stager ClusterIssuer and Production clusterIssuer

    1. • kubectl apply --validate=false -f k8s/cert-manager.yml

       • kubectl apply -f k8s/staging-issuer.yml

       • kubectl apply -f k8s/production-issuer.yml

17. Configure ingress to production (to https)

    1. • kubectl apply -f k8s/ingress-nginx-production.yml