argo-workflow.yaml

apiVersion: argoproj.io/v1alpha1
kind: Workflow                  #new type of k8s spec
metadata:
  generateName: argo-build-
spec:
  entrypoint: argo-build
  arguments:
    parameters:
    - name: block-name
      value: dummy-block-name
    - name: version
      value: dummy-version
    - name: dockerhub-password
      value: password
    - name: dockerhub-username
      value: username
    - name: image-tag
      value: test4   
  volumeClaimTemplates:                 #define volume, same syntax as k8s Pod spec
  - metadata:
      name: workdir                     #name of volume claim
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 1Gi

  templates:
  - name: argo-build
    steps:
    - - name: build
        template: build
    - - name: update-front-end
        template: update-front-end    

  - name: build
    inputs:
      artifacts:
      - name: argo-source
        path: /app/src
        git:
          repo: https://github.com/SnehaMore20/front-end.git
          revision: "argo-hack"
    container:
      image: docker:17.10
      command: [sh, -c]
      args: ["until docker ps; do sleep 3; done; cd /app/src/; GROUP='{{workflow.parameters.dockerhub-username}}' COMMIT='{{workflow.parameters.image-tag}}' ./scripts/build.sh; docker login -u='{{workflow.parameters.dockerhub-username}}' -p='{{workflow.parameters.dockerhub-password}}'; docker push '{{workflow.parameters.dockerhub-username}}'/argo-hack:'{{workflow.parameters.image-tag}}'"]
      env:
      - name: DOCKER_HOST               #the docker daemon can be access on the standard port on localhost
        value: 127.0.0.1
    sidecars:
    - name: dind
      image: docker:17.10-dind          #Docker already provides an image for running a Docker daemon
      securityContext:
        privileged: true                #the Docker daemon can only run in a privileged container
      # mirrorVolumeMounts will mount the same volumes specified in the main container
      # to the sidecar (including artifacts), at the same mountPaths. This enables
      # dind daemon to (partially) see the same filesystem as the main container in
      # order to use features such as docker volume binding.
      mirrorVolumeMounts: true        
    metadata:
      labels:
        block-name: "{{workflow.parameters.block-name}}"
        version: "{{workflow.parameters.version}}"


  - name: update-front-end
    resource:                   #indicates that this is a resource template
      action: apply            #can be any kubectl action (e.g. create, delete, apply, patch)
      manifest: |               #put your kubernetes spec here
        apiVersion: extensions/v1beta1
        kind: Deployment
        metadata:
          name: front-end
          namespace: default
        spec:
          replicas: 1
          template:
            metadata:
              labels:
                name: front-end
            spec:
              containers:
              - name: front-end
                image: "{{workflow.parameters.dockerhub-username}}/argo-hack:{{workflow.parameters.image-tag}}"
                resources:
                  limits:
                    cpu: 300m
                    memory: 1000Mi
                  requests:
                    cpu: 100m
                    memory: 300Mi
                ports:
                - containerPort: 8079
                env:
                - name: SESSION_REDIS
                  value: "true"
                securityContext:
                  runAsNonRoot: true
                  runAsUser: 10001
                  capabilities:
                    drop:
                      - all
                  readOnlyRootFilesystem: true
                livenessProbe:
                  httpGet:
                    path: /
                    port: 8079
                  initialDelaySeconds: 300
                  periodSeconds: 3
                readinessProbe:
                  httpGet:
                    path: /
                    port: 8079
                  initialDelaySeconds: 30
                  periodSeconds: 3
              nodeSelector:
                beta.kubernetes.io/os: linux
    metadata:
      labels:
        block-name: "{{workflow.parameters.block-name}}"
        version: "{{workflow.parameters.version}}"