Kubernetes Playground

Playground to learn deployment a web service on a cluster. For more details and motivation, check my post

Before you start

Make sure you have a Google Cloud Platform (GCP) account and then:

GCP provides 300$ free budget for new users.

• Create a project
• Enable Google Kubernetes Engine (GKE).
• Enable Google Container Registry (GCR).

Then:

• Install Go
• Install Terraform CLI.
• Install Kubernetes CLI
• Install Google Cloud CLI

Login to your GCP account through gcloud:

gcloud auth application-default login

Configure Docker to access private registry:

gcloud auth configure-docker

Create a cluster

Before you start, make sure you set variables according to your project in variables.tf

cd <PROJECT_DIRECTORY>
terraform init
terraform apply

This may take a while. After your cluster is created,

gcloud container clusters get-credentials <CLUSTER_NAME>

This will set kubectl to access your cluster. To verify:

kubectl cluster-info

Allow Kubernetes to Pull Images from GCR

kubectl create secret docker-registry gcr-access-token \
--docker-server=eu.gcr.io \
--docker-username=oauth3accesstoken \
--docker-password="$(gcloud auth print-access-token)" \
--docker-email=your@email.com

Deploy Hello Service

make hello-push-image
kubectl apply -f definitions/hello

Deploy TODO Service

We start with deploying databases that we use, and then deploy TODO service.

Deploy PostgreSQL

1. Create a persistent volume

kubectl apply -f definitions/postgre/pg-pv.yaml

2. Create a persistenv volume claim

kubectl apply -f definitions/postgre/pg-pvc.yaml

3. Create PostreSQL Deployment

kubectl apply -f definitions/postgre/pg-deployment.yaml

4. Create PostgreSQL Service

kubectl apply -f definitions/postgre/pg-service.yaml

5. Verify if it works properly:

kubectl get pods

If the status of the pod with name postgres is running, then it works properly.

6. Use secrets for password protection

kubectl create secret generic pg-password \
--from-literal=password=<YOUR_PASSWORD>

Deploy Redis

1. Create config map

kubectl apply -f definitions/redis/redis-configmap.yaml

2. Create Redis Deployment

kubectl apply -f definitions/redis/redis-deployment.yaml

3. Create Redis Service

kubectl apply -f definitions/redis/redis-service.yaml

Deploy TODO Service

1. Build and push Docker image

make todo-push-image
kubectl apply -f definitions/todo