gmhafiz / k8s-devops

Deploy Three Applications in Kubernetes Demo

Full guide at https://www.gmhafiz.com/blog/deploy-applications-in-kubernetes/

1. Database

Instructions are in this file.

vim ./db/README.md

API

Dockerise

cd ..
git clone https://github.com/gmhafiz/k8s-api
cd k8s-api

cat README.md

Deploy

Set image tag

TAG=$(git rev-parse HEAD)
echo $TAG

Build image

docker build -f Dockerfile-api -t gmhafiz/api:$TAG .
docker build -f Dockerfile-migrate -t gmhafiz/migrate:$TAG .

Push to container registry

docker push gmhafiz/api:${TAG}
docker push gmhafiz/migrate:${TAG}

2. Deploy API

kubectl apply -f configmap.yaml
kubectl apply -f server.yaml
kubectl apply -f service.yaml

Edit migrate image

vim migrate-job.yaml

Run migration

kubectl apply -f migrate-job.yaml

View migrate log

kubectl get pods
kubectl logs -f migrate-job-zhmpt

# returns

2023/09/09 02:49:30 starting migrate...
2023/09/09 02:49:30 reading env
2023/09/09 02:49:30 connecting to database... 
2023/09/09 02:49:30 database connected
2023/09/09 02:49:30 OK   20230302080119_create_randoms_table.sql (42.53ms)
2023/09/09 02:49:30 goose: no migrations to run. current version: 20230302080119
2023/09/09 02:49:30 goose: version 20230302080119

Port Forward

Port forward

kubectl port-forward --namespace default svc/server 3080:3080

Test

In a new terminal

curl http://localhost:3080/randoms

3. Frontend

Build

cd ..
git clone https://github.com/gmhafiz/k8s-web
cd k8s-web

TAG=$(git rev-parse HEAD)
echo $TAG
docker build -t gmhafiz/web:${TAG} .
docker push gmhafiz/web:${TAG} 

Deploy

Change directory

cd k8s-devops/web

Edit image tag

vim web.yaml
# gmhafiz/web:b169cbaecb549b11f5597ef6dd2f7647fd1133cc <--

kubectl apply -f web.yaml

Port forward

kubectl port-forward svc/web 8080:8080

Go to http://localhost:8080 and enjoy!