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Bring Your Own Prometheus

KubeSphere comes with several pre-installed customized monitoring components including Prometheus Operator, Prometheus, Alertmanager, Grafana (Optional), various ServiceMonitors, node-exporter, and kube-state-metrics. These components might already exist before you install KubeSphere. It is possible to use your own Prometheus stack setup in KubeSphere v3.0.0.

Steps to Bring Your Own Prometheus

To use your own Prometheus stack setup, perform the following steps:

Uninstall the customized Prometheus stack of KubeSphere
Install your own Prometheus stack
Install KubeSphere customized stuff to your Prometheus stack
Change KubeSphere's monitoring endpoint

Step 1. Uninstall the customized Prometheus stack of KubeSphere

Execute the following commands to uninstall the stack:

kubectl -n kubesphere-system exec $(kubectl get pod -n kubesphere-system -l app=ks-install -o jsonpath='{.items[0].metadata.name}') -- kubectl delete -f /kubesphere/kubesphere/prometheus/alertmanager/ 2>/dev/null
kubectl -n kubesphere-system exec $(kubectl get pod -n kubesphere-system -l app=ks-install -o jsonpath='{.items[0].metadata.name}') -- kubectl delete -f /kubesphere/kubesphere/prometheus/devops/ 2>/dev/null
kubectl -n kubesphere-system exec $(kubectl get pod -n kubesphere-system -l app=ks-install -o jsonpath='{.items[0].metadata.name}') -- kubectl delete -f /kubesphere/kubesphere/prometheus/etcd/ 2>/dev/null
kubectl -n kubesphere-system exec $(kubectl get pod -n kubesphere-system -l app=ks-install -o jsonpath='{.items[0].metadata.name}') -- kubectl delete -f /kubesphere/kubesphere/prometheus/grafana/ 2>/dev/null
kubectl -n kubesphere-system exec $(kubectl get pod -n kubesphere-system -l app=ks-install -o jsonpath='{.items[0].metadata.name}') -- kubectl delete -f /kubesphere/kubesphere/prometheus/kube-state-metrics/ 2>/dev/null
kubectl -n kubesphere-system exec $(kubectl get pod -n kubesphere-system -l app=ks-install -o jsonpath='{.items[0].metadata.name}') -- kubectl delete -f /kubesphere/kubesphere/prometheus/node-exporter/ 2>/dev/null
kubectl -n kubesphere-system exec $(kubectl get pod -n kubesphere-system -l app=ks-install -o jsonpath='{.items[0].metadata.name}') -- kubectl delete -f /kubesphere/kubesphere/prometheus/upgrade/ 2>/dev/null
kubectl -n kubesphere-system exec $(kubectl get pod -n kubesphere-system -l app=ks-install -o jsonpath='{.items[0].metadata.name}') -- kubectl delete -f /kubesphere/kubesphere/prometheus/prometheus-rules-v1.16\+.yaml 2>/dev/null
kubectl -n kubesphere-system exec $(kubectl get pod -n kubesphere-system -l app=ks-install -o jsonpath='{.items[0].metadata.name}') -- kubectl delete -f /kubesphere/kubesphere/prometheus/prometheus-rules.yaml 2>/dev/null
kubectl -n kubesphere-system exec $(kubectl get pod -n kubesphere-system -l app=ks-install -o jsonpath='{.items[0].metadata.name}') -- kubectl delete -f /kubesphere/kubesphere/prometheus/prometheus 2>/dev/null
# Uncomment this line if you don't have Prometheus managed by Prometheus Operator in other namespaces.
# kubectl -n kubesphere-system exec $(kubectl get pod -n kubesphere-system -l app=ks-install -o jsonpath='{.items[0].metadata.name}') -- kubectl delete -f /kubesphere/kubesphere/prometheus/init/ 2>/dev/null

Delete the PVC that Prometheus used.

kubectl -n kubesphere-monitoring-system delete pvc `kubectl -n kubesphere-monitoring-system get pvc | grep -v VOLUME | awk '{print $1}' |  tr '\n' ' '`

Step 2. Install your own Prometheus stack

Note

KubeSphere 3.0.0 was certified to work well with the following Prometheus stack components:

Prometheus Operator v0.38.3+
Prometheus v2.20.1+
Alertmanager v0.21.0+
kube-state-metrics v1.9.6
node-exporter v0.18.1

Make sure your Prometheus stack components' version meets these version requirements especially node-exporter and kube-state-metrics.

Make sure you install node-exporter and kube-state-metrics if only Prometheus Operator and Prometheus were installed. node-exporter and kube-state-metrics are required for KubeSphere to work properly.

If you've already had the entire Prometheus stack up and running, you can skip this step.

The Prometheus stack can be installed in many ways. The following steps show how to install it into the namespace monitoring using upstream kube-prometheus.

Get kube-prometheus version v0.6.0 whose node-exporter's version v0.18.1 matches the one KubeSphere v3.0.0 is using.

cd ~ && git clone https://github.com/prometheus-operator/kube-prometheus.git && cd kube-prometheus && git checkout tags/v0.6.0 -b v0.6.0

Setup the monitoring namespace, and install Prometheus Operator and corresponding roles:
```
kubectl apply -f manifests/setup/
```
Wait until Prometheus Operator is up and running.
```
kubectl -n monitoring get pod --watch
```
Remove unnecessary components such as Prometheus Adapter.
```
rm -rf manifests/prometheus-adapter-*.yaml
```
Change kube-state-metrics to the same version v1.9.6 as KubeSphere v3.0.0 is using.
```
sed -i 's/v1.9.5/v1.9.6/g' manifests/kube-state-metrics-deployment.yaml
```
Install Prometheus, Alertmanager, Grafana, kube-state-metrics, and node-exporter. You can only install kube-state-metrics or node-exporter by only applying the yaml file kube-state-metrics-*.yaml or node-exporter-*.yaml.
```
kubectl apply -f manifests/
```

Step 3. Install KubeSphere customized stuff to your Prometheus stack

Note

KubeSphere 3.0.0 uses Prometheus Operator to manage Prometheus/Alertmanager config and lifecycle, ServiceMonitor (to manage scrape config), and PrometheusRule (to manage Prometheus recording/alert rules).

There are a few items listed in KubeSphere kustomization, among which prometheus-rules.yaml and prometheus-rulesEtcd.yaml are required for KubeSphere v3.0.0 to work properly and others are optional. You can remove alertmanager-secret.yaml if you don't want your existing Alertmanager's config to be overwritten. You can remove xxx-serviceMonitor.yaml if you don't want your own ServiceMonitors to be overwritten (KubeSphere customized ServiceMonitors discard many irrelevant metrics to make sure Prometheus only stores the most useful metrics).

If your Prometheus stack setup isn't managed by Prometheus Operator, you can skip this step. But you have to make sure that:

You must copy the recording/alerting rules in PrometheusRule and PrometheusRule for etcd to your Prometheus config for KubeSphere v3.0.0 to work properly.
Configure your Prometheus to scrape metrics from the same targets as the ServiceMonitors listed in KubeSphere kustomization.

Get KubeSphere v3.0.0 customized kube-prometheus.

cd ~ && mkdir kubesphere && cd kubesphere && git clone https://github.com/kubesphere/kube-prometheus.git && cd kube-prometheus/kustomize

Change the namespace to your own in which the Prometheus stack is deployed. For example, it is monitoring if you install Prometheus in the monitoring namespace following Step 2.
```
sed -i 's/my-namespace/<your own namespace>/g' kustomization.yaml
```
Apply KubeSphere customized stuff including Prometheus rules, Alertmanager config, and various ServiceMonitors.
```
kubectl apply -k .
```

Setup Services for kube-scheduler and kube-controller-manager metrics exposure.

kubectl apply -f ./prometheus-serviceKubeScheduler.yaml
kubectl apply -f ./prometheus-serviceKubeControllerManager.yaml

Find the Prometheus CR which is usually Kubernetes in your own namespace.
```
kubectl -n <your own namespace> get prometheus
```
Set the Prometheus rule evaluation interval to 1m to be consistent with the KubeSphere v3.0.0 customized ServiceMonitor. The Rule evaluation interval should be greater or equal to the scrape interval.
```
kubectl -n <your own namespace> patch prometheus k8s --patch '{
  "spec": {
    "evaluationInterval": "1m"
  }
}' --type=merge
```

Step 4. Change KubeSphere's `monitoring endpoint`

Now that your own Prometheus stack is up and running, you can change KubeSphere's monitoring endpoint to use your own Prometheus.

Edit kubesphere-config by running the following command:

kubectl edit cm -n kubesphere-system kubesphere-config

Navigate to the monitoring endpoint section as below:

    monitoring:
      endpoint: http://prometheus-operated.kubesphere-monitoring-system.svc:9090

Change monitoring endpoint to your own Prometheus:

    monitoring:
      endpoint: http://prometheus-operated.monitoring.svc:9090

Run the following command to restart the KubeSphere APIServer.

kubectl -n kubesphere-system rollout restart deployment/ks-apiserver

Warning

If you enable/disable KubeSphere pluggable components following this guide , the monitoring endpoint will be reset to the original one. In this case, you have to change it to the new one and then restart the KubeSphere APIServer again.

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