Build docker image locally and run in kubernetes

Building docker image in minikube

Start minikube

• minikube start

Set docker env

• eval $(minikube docker-env) # unix shells
• minikube docker-env | Invoke-Expression # PowerShell

Build image

• docker build -t image_name .

Running Kubernetes cluster

Deployment

• Blueprint of a deployment
• specify imagePullPolicy: Never in spec to use local docker image
• Example deployment configuration is in soil-app.yaml file

Service

• To add deployments and service in same file add --- and press enter
• Then start writing the service configurations
• Service is used to communicate with the pods running the application
• There are no deployments without service
• Add type: LoadBalancer in spec and assign nodePort inside port in spec to create external service
• nodePort has range 30000 - 32767
• Note:- In minikube we have to set external ip address for external service using

  minikube service name_of_service
  

Use command kubectl apply -f file_name.yaml to create the object [deployment, secret, service , etc]

use pip install --no-cache-dir -r requirements.txt in docker file to avoid caching python packages and reduce image size