Add deployment for Stackdriver Metadata Agent with version and resource requirement controlled by env variable

cluster/addons/metadata-agent/OWNERS

@@ -0,0 +1,6 @@
+approvers:
+- kawych
+- piosz
+reviewers:
+- kawych
+- piosz

cluster/addons/metadata-agent/README.md

@@ -0,0 +1,4 @@
+# Kubernetes Metadata Agent
+
+Metadata Agent is a source of metadata required by logging and monitoring agents
+running on a cluster.

cluster/addons/metadata-agent/stackdriver/metadata-agent.yaml

@@ -0,0 +1,38 @@
+kind: DaemonSet
+apiVersion: extensions/v1beta1
+metadata:
+  labels:
+    app: stackdriver-agents
+    kubernetes.io/cluster-service: "true"
+    addonmanager.kubernetes.io/mode: Reconcile
+  name: stackdriver-agents
+  namespace: kube-system
+spec:
+  selector:
+    matchLabels:
+      app: stackdriver-agents
+  template:
+    metadata:
+      labels:
+        app: stackdriver-agents
+    spec:
+      containers:
+      - image: us.gcr.io/container-monitoring-storage/stackdriver-metadata-agent:{{ metadata_agent_version }}
+        imagePullPolicy: IfNotPresent
+        name: metadata-agent
+        ports:
+        - containerPort: 8000
+          hostPort: 8000
+          protocol: TCP
+        resources:
+          requests:
+            cpu: {{ metadata_agent_cpu_request }}
+            memory: {{ metadata_agent_memory_request }}
+      dnsPolicy: ClusterFirst
+      restartPolicy: Always
+      schedulerName: default-scheduler
+      terminationGracePeriodSeconds: 30
+  updateStrategy:
+    rollingUpdate:
+      maxUnavailable: 1
+    type: RollingUpdate

cluster/common.sh

@@ -610,6 +610,8 @@ KUBERNETES_MASTER_NAME: $(yaml-quote ${KUBERNETES_MASTER_NAME})
 ALLOCATE_NODE_CIDRS: $(yaml-quote ${ALLOCATE_NODE_CIDRS:-false})
 ENABLE_CLUSTER_MONITORING: $(yaml-quote ${ENABLE_CLUSTER_MONITORING:-none})
 ENABLE_METRICS_SERVER: $(yaml-quote ${ENABLE_METRICS_SERVER:-false})
+ENABLE_METADATA_AGENT: $(yaml-quote ${ENABLE_METADATA_AGENT:-none})
+METADATA_AGENT_VERSION: $(yaml-quote ${METADATA_AGENT_VERSION:-})
 DOCKER_REGISTRY_MIRROR_URL: $(yaml-quote ${DOCKER_REGISTRY_MIRROR_URL:-})
 ENABLE_L7_LOADBALANCING: $(yaml-quote ${ENABLE_L7_LOADBALANCING:-none})
 ENABLE_CLUSTER_LOGGING: $(yaml-quote ${ENABLE_CLUSTER_LOGGING:-false})

cluster/gce/config-default.sh

@@ -145,6 +145,16 @@ ENABLE_CLUSTER_MONITORING="${KUBE_ENABLE_CLUSTER_MONITORING:-influxdb}"
 # TODO(piosz) remove this option once Metrics Server became a stable thing.
 ENABLE_METRICS_SERVER="${KUBE_ENABLE_METRICS_SERVER:-true}"
 
+# Optional: Metadata agent to setup as part of the cluster bring up:
+#   none        - No metadata agent
+#   stackdriver - Stackdriver metadata agent
+# Metadata agent is a daemon set that provides metadata of kubernetes objects
+# running on the same node for exporting metrics and logs.
+ENABLE_METADATA_AGENT="${KUBE_ENABLE_METADATA_AGENT:-none}"
+
+# Version tag of metadata agent
+METADATA_AGENT_VERSION="${KUBE_METADATA_AGENT_VERSION:-0.2-0.0.13-5}"
+
 # One special node out of NUM_NODES would be created of this type if specified.
 # Useful for scheduling heapster in large clusters with nodes of small size.
 HEAPSTER_MACHINE_TYPE="${HEAPSTER_MACHINE_TYPE:-}"

cluster/gce/container-linux/configure-helper.sh

@@ -1289,6 +1289,20 @@ EOF
     sed -i -e "s@{{ *metrics_cpu_per_node *}}@${metrics_cpu_per_node}@g" "${controller_yaml}"
     update-prometheus-to-sd-parameters ${controller_yaml}
   fi
+  if [[ "${ENABLE_CLUSTER_MONITORING:-}" == "stackdriver" ]] ||
+     ([[ "${ENABLE_CLUSTER_LOGGING:-}" == "true" ]] &&
+     [[ "${LOGGING_DESTINATION:-}" == "gcp" ]]); then
+    if [[ "${ENABLE_METADATA_AGENT:-}" == "stackdriver" ]] &&
+       [[ "${METADATA_AGENT_VERSION:-}" != "" ]]; then
+      metadata_agent_cpu_request="${METADATA_AGENT_CPU_REQUEST:-40m}"
+      metadata_agent_memory_request="${METADATA_AGENT_MEMORY_REQUEST:-50Mi}"
+      setup-addon-manifests "addons" "metadata-agent/stackdriver"
+      deployment_yaml="${dst_dir}/metadata-agent/stackdriver/metadata-agent.yaml"
+      sed -i -e "s@{{ metadata_agent_version }}@${METADATA_AGENT_VERSION}@g" "${deployment_yaml}"
+      sed -i -e "s@{{ metadata_agent_cpu_request }}@${metadata_agent_cpu_request}@g" "${deployment_yaml}"
+      sed -i -e "s@{{ metadata_agent_memory_request }}@${metadata_agent_memory_request}@g" "${deployment_yaml}"
+    fi
+  fi
   if [[ "${ENABLE_METRICS_SERVER:-}" == "true" ]]; then
     setup-addon-manifests "addons" "metrics-server"
   fi

cluster/gce/gci/configure-helper.sh

@@ -1854,6 +1854,20 @@ EOF
     sed -i -e "s@{{ *metrics_cpu_per_node *}}@${metrics_cpu_per_node}@g" "${controller_yaml}"
     update-prometheus-to-sd-parameters ${controller_yaml}
   fi
+  if [[ "${ENABLE_CLUSTER_MONITORING:-}" == "stackdriver" ]] ||
+     ([[ "${ENABLE_CLUSTER_LOGGING:-}" == "true" ]] &&
+     [[ "${LOGGING_DESTINATION:-}" == "gcp" ]]); then
+    if [[ "${ENABLE_METADATA_AGENT:-}" == "stackdriver" ]] &&
+       [[ "${METADATA_AGENT_VERSION:-}" != "" ]]; then
+      metadata_agent_cpu_request="${METADATA_AGENT_CPU_REQUEST:-40m}"
+      metadata_agent_memory_request="${METADATA_AGENT_MEMORY_REQUEST:-50Mi}"
+      setup-addon-manifests "addons" "metadata-agent/stackdriver"
+      deployment_yaml="${dst_dir}/metadata-agent/stackdriver/metadata-agent.yaml"
+      sed -i -e "s@{{ metadata_agent_version }}@${METADATA_AGENT_VERSION}@g" "${deployment_yaml}"
+      sed -i -e "s@{{ metadata_agent_cpu_request }}@${metadata_agent_cpu_request}@g" "${deployment_yaml}"
+      sed -i -e "s@{{ metadata_agent_memory_request }}@${metadata_agent_memory_request}@g" "${deployment_yaml}"
+    fi
+  fi
   if [[ "${ENABLE_METRICS_SERVER:-}" == "true" ]]; then
     setup-addon-manifests "addons" "metrics-server"
   fi