Add kubernetes manifests for Heartbeat (elastic#17928)

* Add kubernetes manifests for Heartbeat

(cherry picked from commit 16759ab)

deploy/kubernetes/Makefile

@@ -1,4 +1,4 @@
-ALL=filebeat metricbeat auditbeat
+ALL=filebeat metricbeat auditbeat heartbeat
 BEAT_VERSION=$(shell head -n 1 ../../libbeat/docs/version.asciidoc | cut -c 17- )
 
 .PHONY: all $(ALL)

deploy/kubernetes/README.md

@@ -9,3 +9,5 @@ Beat | Description
 ---- | ----
 [filebeat](filebeat) | Tails and ships logs
 [metricbeat](metricbeat) | Fetches sets of metrics from the operating system and services
+[auditbeat](auditbeat) | Collect Linux audit framework data and monitor files integrity
+[heartbeat](heartbeat) | Monitor services for their availability with active probing

deploy/kubernetes/heartbeat-kubernetes.yaml

@@ -0,0 +1,159 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: heartbeat-deployment-config
+  namespace: kube-system
+  labels:
+    k8s-app: heartbeat
+data:
+  heartbeat.yml: |-
+    #heartbeat.autodiscover:
+    #  # Autodiscover pods
+    #  providers:
+    #    - type: kubernetes
+    #      resource: pod
+    #      scope: cluster
+    #      node: ${NODE_NAME}
+    #      hints.enabled: true
+    #
+    #  # Autodiscover services
+    #  providers:
+    #    - type: kubernetes
+    #      resource: service
+    #      scope: cluster
+    #      node: ${NODE_NAME}
+    #      hints.enabled: true
+    #
+    #  # Autodiscover nodes
+    #  providers:
+    #    - type: kubernetes
+    #      resource: node
+    #      node: ${NODE_NAME}
+    #      scope: cluster
+    #      templates:
+    #        # Example, check SSH port of all cluster nodes:
+    #        - condition: ~
+    #          config:
+    #            - hosts:
+    #                - ${data.host}:22
+    #              name: ${data.kubernetes.node.name}
+    #              schedule: '@every 10s'
+    #              timeout: 5s
+    #              type: tcp
+
+    processors:
+      - add_cloud_metadata:
+
+    cloud.id: ${ELASTIC_CLOUD_ID}
+    cloud.auth: ${ELASTIC_CLOUD_AUTH}
+
+    output.elasticsearch:
+      hosts: ['${ELASTICSEARCH_HOST:elasticsearch}:${ELASTICSEARCH_PORT:9200}']
+      username: ${ELASTICSEARCH_USERNAME}
+      password: ${ELASTICSEARCH_PASSWORD}
+---
+# Deploy singleton instance in the whole cluster for some unique data sources, like kube-state-metrics
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: heartbeat
+  namespace: kube-system
+  labels:
+    k8s-app: heartbeat
+spec:
+  selector:
+    matchLabels:
+      k8s-app: heartbeat
+  template:
+    metadata:
+      labels:
+        k8s-app: heartbeat
+    spec:
+      serviceAccountName: heartbeat
+      hostNetwork: true
+      dnsPolicy: ClusterFirstWithHostNet
+      containers:
+      - name: heartbeat
+        image: docker.elastic.co/beats/heartbeat:8.0.0
+        args: [
+          "-c", "/etc/heartbeat.yml",
+          "-e",
+        ]
+        env:
+        - name: ELASTICSEARCH_HOST
+          value: elasticsearch
+        - name: ELASTICSEARCH_PORT
+          value: "9200"
+        - name: ELASTICSEARCH_USERNAME
+          value: elastic
+        - name: ELASTICSEARCH_PASSWORD
+          value: changeme
+        - name: ELASTIC_CLOUD_ID
+          value:
+        - name: ELASTIC_CLOUD_AUTH
+          value:
+        - name: NODE_NAME
+          valueFrom:
+            fieldRef:
+              fieldPath: spec.nodeName
+        securityContext:
+          runAsUser: 0
+        resources:
+          limits:
+            memory: 200Mi
+          requests:
+            cpu: 100m
+            memory: 100Mi
+        volumeMounts:
+        - name: config
+          mountPath: /etc/heartbeat.yml
+          readOnly: true
+          subPath: heartbeat.yml
+        - name: data
+          mountPath: /usr/share/heartbeat/data
+      volumes:
+      - name: config
+        configMap:
+          defaultMode: 0600
+          name: heartbeat-deployment-config
+      - name: data
+        hostPath:
+          path: /var/lib/heartbeat-data
+          type: DirectoryOrCreate
+
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: heartbeat
+subjects:
+- kind: ServiceAccount
+  name: heartbeat
+  namespace: kube-system
+roleRef:
+  kind: ClusterRole
+  name: heartbeat
+  apiGroup: rbac.authorization.k8s.io
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: heartbeat
+  labels:
+    k8s-app: heartbeat
+rules:
+- apiGroups: [""]
+  resources:
+  - nodes
+  - namespaces
+  - pods
+  verbs: ["get", "list", "watch"]
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: heartbeat
+  namespace: kube-system
+  labels:
+    k8s-app: heartbeat
+---

deploy/kubernetes/heartbeat/README.md

@@ -0,0 +1,30 @@
+# Heartbeat
+
+## Monitor Kubernetes services uptime
+
+### Kubernetes Deployment
+
+Heartbeat can be deployed to monitor the whole cluster from a single pod.
+
+Everything is deployed under `kube-system` namespace, you can change that by
+updating YAML manifests under this folder.
+
+### Settings
+
+We use official [Beats Docker images](https://github.com/elastic/beats-docker),
+as they allow external files configuration, a [ConfigMap](https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/)
+is used for kubernetes specific settings. Check [heartbeat-configmap.yaml](heartbeat-configmap.yaml)
+for details.
+
+Also, [heartbeat-deployment.yaml](heartbeat-deployment.yaml) uses a set of environment
+variables to configure Elasticsearch output:
+
+Variable | Default | Description
+-------- | ------- | -----------
+ELASTICSEARCH_HOST | elasticsearch | Elasticsearch host
+ELASTICSEARCH_PORT | 9200 | Elasticsearch port
+ELASTICSEARCH_USERNAME | elastic | Elasticsearch username for HTTP auth
+ELASTICSEARCH_PASSWORD | changeme | Elasticsearch password
+
+If there is an existing `elasticsearch` service in the kubernetes cluster these
+defaults will use it.

deploy/kubernetes/heartbeat/heartbeat-configmap.yaml

@@ -0,0 +1,53 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: heartbeat-deployment-config
+  namespace: kube-system
+  labels:
+    k8s-app: heartbeat
+data:
+  heartbeat.yml: |-
+    #heartbeat.autodiscover:
+    #  # Autodiscover pods
+    #  providers:
+    #    - type: kubernetes
+    #      resource: pod
+    #      scope: cluster
+    #      node: ${NODE_NAME}
+    #      hints.enabled: true
+    #
+    #  # Autodiscover services
+    #  providers:
+    #    - type: kubernetes
+    #      resource: service
+    #      scope: cluster
+    #      node: ${NODE_NAME}
+    #      hints.enabled: true
+    #
+    #  # Autodiscover nodes
+    #  providers:
+    #    - type: kubernetes
+    #      resource: node
+    #      node: ${NODE_NAME}
+    #      scope: cluster
+    #      templates:
+    #        # Example, check SSH port of all cluster nodes:
+    #        - condition: ~
+    #          config:
+    #            - hosts:
+    #                - ${data.host}:22
+    #              name: ${data.kubernetes.node.name}
+    #              schedule: '@every 10s'
+    #              timeout: 5s
+    #              type: tcp
+
+    processors:
+      - add_cloud_metadata:
+
+    cloud.id: ${ELASTIC_CLOUD_ID}
+    cloud.auth: ${ELASTIC_CLOUD_AUTH}
+
+    output.elasticsearch:
+      hosts: ['${ELASTICSEARCH_HOST:elasticsearch}:${ELASTICSEARCH_PORT:9200}']
+      username: ${ELASTICSEARCH_USERNAME}
+      password: ${ELASTICSEARCH_PASSWORD}

deploy/kubernetes/heartbeat/heartbeat-deployment.yaml

@@ -0,0 +1,69 @@
+# Deploy singleton instance in the whole cluster for some unique data sources, like kube-state-metrics
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: heartbeat
+  namespace: kube-system
+  labels:
+    k8s-app: heartbeat
+spec:
+  selector:
+    matchLabels:
+      k8s-app: heartbeat
+  template:
+    metadata:
+      labels:
+        k8s-app: heartbeat
+    spec:
+      serviceAccountName: heartbeat
+      hostNetwork: true
+      dnsPolicy: ClusterFirstWithHostNet
+      containers:
+      - name: heartbeat
+        image: docker.elastic.co/beats/heartbeat:%VERSION%
+        args: [
+          "-c", "/etc/heartbeat.yml",
+          "-e",
+        ]
+        env:
+        - name: ELASTICSEARCH_HOST
+          value: elasticsearch
+        - name: ELASTICSEARCH_PORT
+          value: "9200"
+        - name: ELASTICSEARCH_USERNAME
+          value: elastic
+        - name: ELASTICSEARCH_PASSWORD
+          value: changeme
+        - name: ELASTIC_CLOUD_ID
+          value:
+        - name: ELASTIC_CLOUD_AUTH
+          value:
+        - name: NODE_NAME
+          valueFrom:
+            fieldRef:
+              fieldPath: spec.nodeName
+        securityContext:
+          runAsUser: 0
+        resources:
+          limits:
+            memory: 200Mi
+          requests:
+            cpu: 100m
+            memory: 100Mi
+        volumeMounts:
+        - name: config
+          mountPath: /etc/heartbeat.yml
+          readOnly: true
+          subPath: heartbeat.yml
+        - name: data
+          mountPath: /usr/share/heartbeat/data
+      volumes:
+      - name: config
+        configMap:
+          defaultMode: 0600
+          name: heartbeat-deployment-config
+      - name: data
+        hostPath:
+          path: /var/lib/heartbeat-data
+          type: DirectoryOrCreate
+

deploy/kubernetes/heartbeat/heartbeat-role-binding.yaml

@@ -0,0 +1,12 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: heartbeat
+subjects:
+- kind: ServiceAccount
+  name: heartbeat
+  namespace: kube-system
+roleRef:
+  kind: ClusterRole
+  name: heartbeat
+  apiGroup: rbac.authorization.k8s.io

deploy/kubernetes/heartbeat/heartbeat-role.yaml

@@ -0,0 +1,13 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: heartbeat
+  labels:
+    k8s-app: heartbeat
+rules:
+- apiGroups: [""]
+  resources:
+  - nodes
+  - namespaces
+  - pods
+  verbs: ["get", "list", "watch"]

deploy/kubernetes/heartbeat/heartbeat-service-account.yaml

@@ -0,0 +1,7 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: heartbeat
+  namespace: kube-system
+  labels:
+    k8s-app: heartbeat