k8s-mesh-component-rollback-example.groovy

k8s-mesh-component-rollback-example.groovy

@Library('medusa@master') _

node('docker') {
    
    deleteDir()
    
    def applicationDefinition = [
        Pipeline: [
            AssemblyLine: 'sandbox'
        ]
    ]
    
    def assemblyLine = getAssemblyLine applicationDefinition: applicationDefinition
    
    def environmentDefinition = getEnvironmentDefinition environmentId: assemblyLine[0]
    
    def kubeApplyFile = 'grafana-temp.yaml'

    _writeApplyFile(kubeApplyFile)
    
    // Return a list of k8s object types that are being applied
    def types = _getApplyTypes(kubeApplyFile)

    withHydra environmentDefinition: environmentDefinition, block: {

        def rollbackFile = 'grafana-temp-rollback.yaml'
        
        // Write each k8s object type to a file with yaml document separator for potential roll back
        types.each { type ->
        
            sh "echo '---' >> ${rollbackFile}"
        
            sh "kubectl apply view-last-applied ${type} grafana-temp -n monitoring -o yaml >> ${rollbackFile}"
        }   
        
        echo "Deployment"
        
        sh "kubectl apply -n monitoring -f ${kubeApplyFile}"
        
        sh 'sleep 10s' //sleep in order to show before and after in cluster
        
        echo "ROLLBACK"
        
        sh "kubectl apply -n monitoring -f ${rollbackFile}"
    }
}

def _getApplyTypes(file) {
    
    def types = []
    
    def kubeApplyYaml = readYaml file: file
    
    kubeApplyYaml.each { kubeObj ->
        
        types.add(kubeObj.kind)
    }  
    
    return types
}

def _writeApplyFile(file) {
    
    writeFile file: file, text: """---
apiVersion: v1
kind: Service
metadata:
  annotations:
    prometheus.io/scrape: 'true'
    service.beta.kubernetes.io/aws-load-balancer-internal: 0.0.0.0/0
    external-dns.alpha.kubernetes.io/hostname: _COMPONENT_DNS_NAME_
  name: grafana-temp
  namespace: monitoring
  labels:
    app: grafana-temp
spec:
  type: LoadBalancer
  ports:
  - port: 3000
    protocol: TCP
    name: http
  selector:
    app: grafana-temp
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  annotations:
    configmap.reloader.stakater.com/reload: "kubernetes-cluster-monitoring-dashboard"
  name: grafana-temp
  namespace: monitoring
spec:
  replicas: 2
  selector:
    matchLabels:
      app: grafana-temp
  template:
    metadata:
      name: grafana-temp
      labels:
        app: grafana-temp
        version: v6.0.0
      annotations:
        sidecar.istio.io/inject: "false"
    spec:
      serviceAccountName: grafana
      containers:
      - name: grafana
        image: 201777367430.dkr.ecr.us-east-1.amazonaws.com/platform/istio/components/grafana:6.0.0
        resources:
          limits:
            cpu: 500m
            memory: 512Mi
          requests:
            cpu: 100m
            memory: 512Mi
        imagePullPolicy: IfNotPresent
        livenessProbe:
          failureThreshold: 3
          httpGet:
            path: /login
            port: 3000
            scheme: HTTP
          initialDelaySeconds: 10
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 1
        ports:
          - containerPort: 3000
        env:
          # Only put environment related config here. Generic Istio config
          # should go in addons/grafana/grafana.ini.
        - name: GF_PATHS_DATA
          value: /data/grafana
        volumeMounts:
        - mountPath: /data/grafana
          name: grafana-data
        - name: config-volume-kubernetes-cluster-monitoring-dashboard
          mountPath: /var/lib/grafana/dashboards/
      priorityClassName: high-priority
      volumes:
      - name: grafana-data
        emptyDir: {}
      - name: config-volume-kubernetes-cluster-monitoring-dashboard
        configMap:
          name: kubernetes-cluster-monitoring-dashboard
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: grafana-temp
  namespace: monitoring
---
apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
    name: grafana-temp
    namespace: monitoring
spec:
    maxReplicas: 5
    minReplicas: 2
    scaleTargetRef:
      apiVersion: apps/v1beta1
      kind: Deployment
      name: grafana-temp
    metrics:
      - type: Resource
        resource:
          name: cpu
          targetAverageUtilization: 75
"""
}