This is Prometheus Integration with rest service exposed using golang application. Golang application is deployed on kubernetes cluster and exposed as rest endpoint url.
There are two matrics exposed:
- Gauge (To count number of pods in cluster)
- Counter (Couting the total request hit count)
Pre-requisite:
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: pod-reader
rules:
- verbs:
- get
- watch
- list
apiGroups:
- ''
resources:
- pods
kind: ServiceAccount
apiVersion: v1
metadata:
name: pod-service-account
namespace: <namespace-name>
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: pod-reader-global
subjects:
- kind: ServiceAccount
name: pod-service-account
namespace: mukul-test
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: pod-reader
Clone code first:
git clone https://github.com/mukul4u2005/matrics.git
Build code:
GOOS=linux go build -o ./matrix-app .
Build docker image:
docker build -t matrix-app .
Tag image
docker tag matrix-app mpdocker2017/matrix-app:latest
Push image to Dockerhub
docker push mpdocker2017/matrix-app:latest
Create Secret for cluster api call, this secret is referenced in metrics deployment to configure as env. variables:
kubectl create secret generic cluster-secret --from-literal=TOKEN=<token> --from-literal=API_URL=<api-url>
Create Prometheus config map for scrapper configuration (For prometheus deployment):
kubectl create configmap prome-config --from-file=<path>/prometheus.yml
Create deployment using yaml available in config folder:
For metrics service (Please change the image url):
kubectl apply -f metrics-deployment.yml
Create Prometheus deployment:
kubectl apply -f prom-deployment.yml
kubectl port-forward pod-name 9090:9090
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