Deploy php application to kubernetes using bitbucket pipelines

Setup docker registry access for kubernetes to pull image from private repo

1. Login to docker hub with username and password:

   docker login

   It will generate a file that holds the authentication token

   cat ~/.docker/config.json

   Output is similar to:

     {
         "auths": {
             "https://index.docker.io/v1/": {
                 "auth": "*******"
             }
         }
     }
   

2. Create a secret

    kubectl create secret generic dock-reg-cred     --from-file=.dockerconfigjson=~/.docker/config.json     --type=kubernetes.io/dockerconfigjson
   

   Note: this will create a secret named dock-reg-cred which can be consumed by any pod in the cluster securely.

3. Assign the secret to the php deployment

        spec:
          imagePullSecrets:
            - name: docker-reg-cred
   

Set up a pipeline with the BitBucket

1. Docker file

   Dockerfile

   The below will build a docker image using php:7.2-fpm as the base image. Also a php file w to represent the successful run of the pipelines and it being deployed successfully to the kube cluster.

    FROM php:7.2-fpm
    
    ARG commit_hash
    
    RUN mkdir -p /build-code && echo "<?php echo 'Deployed using bitbucket pipelines. $commit_hash' ?>'" > /build-code/index.php
    
    WORKDIR /var/www
   

2. Pipeline build and deploy

   Build step to build an image and push it to the docker registry.

    - step:
        name: Build
        script:
          # generate docker image name
          - export IMAGE_NAME=$DOCKER_USERNAME/$BITBUCKET_REPO_SLUG:$BITBUCKET_COMMIT
          # build the Docker image
          - docker build -t $IMAGE_NAME . --build-arg commit_hash=$BITBUCKET_COMMIT
          # authenticate with the Docker Hub registry
          - docker login --username $DOCKER_USERNAME --password $DOCKER_PASSWORD
          # push the new Docker image to the Docker registry
          - docker push $IMAGE_NAME
        services:
          - docker
        caches:
          - docker
   

   Deploy the image to a kube cluster running on a remote server.

    - step:
        name: Deploy
        deployment: testing
        script:
          - pipe: atlassian/ssh-run:0.2.5
            variables:
              SSH_USER: $SSH_USER
              SERVER: $SERVER_ADDRESS
              PORT: $PORT
              #COMMAND: 'kubectl set image deployment/php php=$DOCKER_USERNAME/$BITBUCKET_REPO_SLUG:$BITBUCKET_COMMIT'
              COMMAND: 'sed  "s|{{image}}|$DOCKER_USERNAME/$BITBUCKET_REPO_SLUG:$BITBUCKET_COMMIT|g" ~/php-app/php_deployment.yaml | kubectl apply -f  -'
   

For Kubernetes multi-node cluster deployment please refer to Kubernetes php application

WIN!

References:

1. Configure bitbucket pipelines
2. Bitbucket ssh-run