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App Mesh Prometheus

App Mesh Prometheus Helm chart for Kubernetes

Prerequisites

  • Kubernetes >= 1.13

Installing the Chart

Add the EKS repository to Helm:

helm repo add eks https://aws.github.io/eks-charts

Install App Mesh Prometheus:

helm upgrade -i appmesh-prometheus eks/appmesh-prometheus \
--namespace appmesh-system

Optional: Persist your data
If you do not persist your Prometheus data, then it will only exist as long as the Prometheus pod is running. For Prometheus persistent storage, you need to use PersistentVolumeClaim.
As for the volume plugin, we use EBS CSI Driver as an example, but you can use other popular volume plugins like NFS, Ceph etc.
In configuration, replace your-appmesh-cluster as your EKS appmesh cluster name and your-aws-account as your AWS account ID.

Enable EBS CSI Driver:

  • Initialize iam-oidc-provider
eksctl utils associate-iam-oidc-provider --region=us-west-2 --cluster=your-appmesh-cluster --approve
  • Create IAM role
eksctl create iamserviceaccount \
  --name ebs-csi-controller-sa \
  --namespace kube-system \
  --cluster your-appmesh-cluster \
  --attach-policy-arn arn:aws:iam::aws:policy/service-role/AmazonEBSCSIDriverPolicy \
  --approve \
  --role-only \
  --role-name AmazonEKS_EBS_CSI_DriverRole
  • Addon the EBS driver to running cluster.
eksctl create addon --name aws-ebs-csi-driver --cluster your-appmesh-cluster --service-account-role-arn arn:aws:iam::your-aws-account:role/AmazonEKS_EBS_CSI_DriverRole --force

More details: https://docs.aws.amazon.com/eks/latest/userguide/ebs-csi.html

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: prometheus
  namespace: appmesh-system
  labels:
    app.kubernetes.io/name: appmesh-prometheus
spec:
  storageClassName: gp2
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 100Gi
EOF

helm upgrade -i appmesh-prometheus eks/appmesh-prometheus \
--namespace appmesh-system \
--set retention=12h \
--set persistentVolumeClaim.claimName=prometheus

The configuration section lists the parameters that can be configured during installation.

Uninstalling the Chart

To uninstall/delete the appmesh-prometheus deployment:

helm delete appmesh-prometheus --namespace appmesh-system

The command removes all the Kubernetes components associated with the chart and deletes the release.

Configuration

The following tables lists the configurable parameters of the chart and their default values.

Parameter Description Default
image.repository image repository prom/prometheus
image.tag image tag <VERSION>
image.pullPolicy image pull policy IfNotPresent
resources.requests/cpu pod CPU request 100m
resources.requests/memory pod memory request 256Mi
resources.limits/cpu pod CPU limit 2000m
resources.limits/memory pod memory limit 2Gi
affinity node/pod affinities None
nodeSelector node labels for pod assignment {}
tolerations list of node taints to tolerate []
rbac.create if true, create and use RBAC resources true
rbac.pspEnabled If true, create and use a restricted pod security policy false
serviceAccount.create If true, create a new service account true
serviceAccount.name Service account to be used None
retention When to remove old data 6h
scrapeInterval Interval between consecutive scrapes 5s
persistentVolumeClaim.claimName Specify an existing volume claim to be used for Prometheus data None

Troubleshooting

If the Prometheus port does not open properly, first determine if the Pod is functioning properly. The following is an not ready example:

kubectl -n appmesh-system get deploy,po,svc
NAME                                 READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/appmesh-controller   1/1     1            1           42m
deployment.apps/appmesh-prometheus   0/1     1            0           33m

NAME                                      READY   STATUS    RESTARTS   AGE
pod/appmesh-controller-6dcf8c7787-zgh7w   1/1     Running   0          42m
pod/appmesh-prometheus-6d6ffbb888-5644r   0/1     Pending   0          30m

NAME                                         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
service/appmesh-controller-webhook-service   ClusterIP   10.100.96.3     <none>        443/TCP    42m
service/appmesh-prometheus                   ClusterIP   10.100.53.248   <none>        9090/TCP   33m

If the Pod status is unhealthy and you use PVC for persistent storage, first check the status of the PVC, and check the log in event:

kubectl describe pvc -n appmesh-system

If the problem is not solved, check the node's resource deployment, memory and CPU limits:

kubectl describe nodes

If the node doesn't have enough resources, you can try scaling the cluster.