wget https://storage.googleapis.com/kubernetes-helm/helm-v2.12.3-linux-amd64.tar.gz
tar xzvzf helm-v2.12.3-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin/
kubectl -n kube-system create serviceaccount tiller
kubectl create clusterrolebinding tiller \
--clusterrole cluster-admin \
--serviceaccount=kube-system:tiller
helm init --service-account tiller
kubectl -n kube-system rollout status deploy/tiller-deploy
Waiting for deployment "tiller-deploy" rollout to finish: 0 of 1 updated replicas are available...
deployment "tiller-deploy" successfully rolled out
helm version
Client: &version.Version{SemVer:"v2.12.3", GitCommit:"eecf22f77df5f65c823aacd2dbd30ae6c65f186e", GitTreeState:"clean"}
Server: &version.Version{SemVer:"v2.12.3", GitCommit:"eecf22f77df5f65c823aacd2dbd30ae6c65f186e", GitTreeState:"clean"}
helm install \
--name mon \
--namespace monitoring \
stable/prometheus-operator \
--set prometheus.prometheusSpec.serviceMonitorNamespaceSelector.matchNames[0]=default
helm install --name prometheus-adapter stable/prometheus-adapter --set prometheus.url="http://mon-prometheus-operator-prometheus.monitoring.svc",prometheus.port="9090" --set image.tag="v0.4.1" --set rbac.create="true" --namespace kube-system
kubectl -n kube-system rollout status deploy/prometheus-adapter
Waiting for rollout to finish: 0 of 1 updated replicas are available...
deployment "prometheus-adapter" successfully rolled out
kubectl get --raw /apis/custom.metrics.k8s.io/v1beta1
{"kind":"APIResourceList","apiVersion":"v1","groupVersion":"custom.metrics.k8s.io/v1beta1","resources":[]}
Deploy using kubectl create -f
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: example-deploy
spec:
replicas: 1
template:
metadata:
labels:
app: example
release: mon
spec:
containers:
- name: example
image: quay.io/brancz/prometheus-example-app:v0.1.0
ports:
- containerPort: 8080
---
apiVersion: v1
kind: Service
metadata:
name: example-service
labels:
release: mon
app: example
spec:
ports:
- name: metrics-svc-port
port: 80
targetPort: 8080
selector:
app: example
---
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
name: example-sm
namespace: monitoring
labels:
release: mon
app: example
spec:
jobLabel: examplemetrics
selector:
matchLabels:
release: mon
app: example
namespaceSelector:
matchNames:
- default
endpoints:
- port: metrics-svc-port
interval: 10s
path: /metrics
---
apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
name: example-app-hpa
spec:
scaleTargetRef:
apiVersion: apps/v1beta1
kind: Deployment
name: example-deploy
minReplicas: 1
maxReplicas: 10
metrics:
- type: Object
object:
target:
kind: Service
name: example-service
metricName: http_requests
targetValue: 100
kubectl rollout status deploy/example-deploy
deployment "example-deploy" successfully rolled out
Generate load:
kubectl run -i --tty load-generator --image=busybox /bin/sh
Hit enter for command prompt
while true; do wget -q -O- http://example-service.default.svc.cluster.local; done
Open a 2nd session to watch HPA scale:
kubectl get hpa -w [34/967]
NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE
example-app-hpa Deployment/example-deploy <unknown>/100 1 10 1 33s
example-app-hpa Deployment/example-deploy <unknown>/100 1 10 1 60s
example-app-hpa Deployment/example-deploy 2878m/100 1 10 1 4m
example-app-hpa Deployment/example-deploy 23403m/100 1 10 1 4m30s
example-app-hpa Deployment/example-deploy 40583m/100 1 10 1 5m
example-app-hpa Deployment/example-deploy 51422m/100 1 10 1 5m30s
example-app-hpa Deployment/example-deploy 107006m/100 1 10 1 6m
example-app-hpa Deployment/example-deploy 138397m/100 1 10 2 7m
Test metric http_requests
kubectl get --raw "/apis/custom.metrics.k8s.io/v1beta1/namespaces/default/pods/*/http_requests"
ServiceMonitor should be listed in Targets with valid endpoints, proper labels and no errors
kubectl port-forward svc/mon-prometheus-operator-prometheus 9090:9090 --namespace monitoring
Open http://localhost:9090/targets
- No
ServiceMonitor?: Probably wrongserviceMonitorNamespaceSelectorinkubectl -n monitoring edit prometheus(it only checks its own namespace by default) - No
Endpoints?: Probably wrong labels, they have to match between components to be selected