Kubernetes

FireHydrant's Kubernetes integration allows you to send updates about the workloads deployed in your clusters automatically to FireHydrant. This lets you follow the lifecycle of a change, from GitHub pull request to pod deployment.

Resources Tracked:

  • DaemonSet
  • Deployments
  • ReplicaSet
  • Services
  • StatefulSets

Prerequisites

  • You will need Owner permissions in FireHydrant to generate API keys
  • You will need access to your infrastructure to deploy a Kubernetes manifest.

Installation Instructions

The integration works by spinning up a FireHydrant worker in your cluster that sends updates and calls back to FireHydrant.

You will need an API key for the controller to use for authentication. We recommend creating an API key specifically for this integration. This token goes in the firehydrant-keys Kubernetes secret. See an example manifest file below.

πŸ“˜

Note:

Be sure to change 'YOUR_BOT_TOKEN' and 'YOUR_ENVIRONMENT_NAME' before deploying the manifests.

apiVersion: v1
kind: Namespace
metadata:
  name: firehydrant-system
---
apiVersion: v1
kind: Secret
metadata:
  name: firehydrant-keys
  namespace: firehydrant-system
stringData:
  FIREHYDRANT_API_KEY: 'YOUR_BOT_TOKEN'
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: firehydrant-cm
  namespace: firehydrant-system
data:
  config.yml: |
    apiToken: '$FIREHYDRANT_API_KEY'
    fireHydrantUrl: 'api.firehydrant.io'
    watch:
      - namespace: "*"
        environment: 'YOUR_ENVIRONMENT_NAME'
        resources:
        - resource: deployments.v1.apps
          updateOn: ["spec", "metadata"]
          includeDiff: true
          skipServiceCreate: false
        - resource: configmaps
          updateOn: ["data"]
          includeDiff: true
          skipServiceCreate: true
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: firehydrant-k8s-changelog-serviceaccount
  namespace: firehydrant-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: firehydrant-system-clusterrole
rules:
  - apiGroups:
      - ""
      - "extensions"
      - "apps"
    resources:
      - configmaps
      - services
      - deployments
      - replicasets
      - daemonsets
      - statefulsets
    verbs:
      - list
      - watch
      - get
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: firehydrant-clusterrole-nisa-binding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: firehydrant-system-clusterrole
subjects:
  - kind: ServiceAccount
    name: firehydrant-k8s-changelog-serviceaccount
    namespace: firehydrant-system
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: firehydrant-k8s-changelog
  namespace: firehydrant-system
  labels:
    app: firehydrant-k8s-changelog
    app.kubernetes.io/name: firehydrant-k8s-changelog
    app.kubernetes.io/component: changelog
spec:
  replicas: 1
  strategy:
    type: RollingUpdate
  selector:
    matchLabels:
      app: firehydrant-k8s-changelog
  template:
    metadata:
      labels:
        app: firehydrant-k8s-changelog
    spec:
      serviceAccount: firehydrant-k8s-changelog-serviceaccount
      containers:
      - name: changelog
        image: quay.io/firehydrant/k8s-changelog:v0.0.20
        command:
        - firehydrant-k8s-changelog
        - watch
        envFrom:
        - secretRef:
            name: firehydrant-keys
        volumeMounts:
        - name: config
          mountPath: /etc/k8s-watcher
        resources:
          limits:
            cpu: 10m
            memory: 128Mi
          requests:
            cpu: 10m
            memory: 128Mi
      volumes:
      - name: config
        configMap:
          name: firehydrant-cm

After this is deployed, any changes made to your clusters will automatically be logged in FireHydrant's change events:

Example change event from Kubernetes

Example change event from Kubernetes

In addition, FireHydrant will automatically add new services/pods in your Kubernetes cluster to FireHydrant's Service Catalog as well as the ENVIRONMENT you specify above if it doesn't already exist.

Next Steps