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选题[tech]: 20210601 Start monitoring your Kubernetes cluster with Prometheus and Grafana
sources/tech/20210601 Start monitoring your Kubernetes cluster with Prometheus and Grafana.md
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[#]: subject: (Start monitoring your Kubernetes cluster with Prometheus and Grafana)
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[#]: via: (https://opensource.com/article/21/6/chaos-grafana-prometheus)
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[#]: author: (Jessica Cherry https://opensource.com/users/cherrybomb)
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[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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Start monitoring your Kubernetes cluster with Prometheus and Grafana
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======
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Before you can measure chaos, you need to know what your system's steady
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state looks like. Learn how in the second article in this series about
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chaos engineering.
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![A ship wheel with someone steering][1]
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In my introductory [article about chaos engineering][2], one of the main things I covered was the importance of getting the steady state of your working Kubernetes cluster. Before you can start causing chaos, you need to know what the cluster looks like in a steady state.
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This article will cover how to [get those metrics using Prometheus][3] and [Grafana][4]. This walkthrough also uses Pop!_OS 20.04, Helm 3, Minikube 1.14.2, and Kubernetes 1.19.
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### Configure Minikube
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[Install Minikube][5] in whatever way makes sense for your environment. If you have enough resources, I recommend giving your virtual machine a bit more than the default memory and CPU power:
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```
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$ minikube config set memory 8192
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❗ These changes will take effect upon a minikube delete and then a minikube start
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$ minikube config set cpus 6
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❗ These changes will take effect upon a minikube delete and then a minikube start
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```
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Then start and check your system's status:
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```
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$ minikube start
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😄 minikube v1.14.2 on Debian bullseye/sid
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🎉 minikube 1.19.0 is available! Download it: <https://github.com/kubernetes/minikube/releases/tag/v1.19.0>
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💡 To disable this notice, run: 'minikube config set WantUpdateNotification false'
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✨ Using the docker driver based on user configuration
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👍 Starting control plane node minikube in cluster minikube
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🔥 Creating docker container (CPUs=6, Memory=8192MB) ...
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🐳 Preparing Kubernetes v1.19.0 on Docker 19.03.8 ...
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🔎 Verifying Kubernetes components...
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🌟 Enabled addons: storage-provisioner, default-storageclass
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🏄 Done! kubectl is now configured to use "minikube" by default
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$ minikube status
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minikube
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type: Control Plane
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host: Running
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kubelet: Running
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apiserver: Running
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kubeconfig: Configured
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```
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### Install Prometheus
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Once the cluster is set up, start your installations. Install [Prometheus][6] first by following the instructions below.
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First, add the repository in Helm:
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```
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$ helm repo add prometheus-community <https://prometheus-community.github.io/helm-charts>
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"prometheus-community" has been added to your repositories
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```
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Then install your Prometheus Helm chart. You should see:
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```
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$ helm install prometheus prometheus-community/prometheus
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NAME: prometheus
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LAST DEPLOYED: Sun May 9 11:37:19 2021
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NAMESPACE: default
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STATUS: deployed
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REVISION: 1
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TEST SUITE: None
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NOTES:
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The Prometheus server can be accessed via port 80 on the following DNS name from within your cluster:
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prometheus-server.default.svc.cluster.local
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```
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Get the Prometheus server URL by running these commands in the same shell:
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```
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export POD_NAME=$(kubectl get pods --namespace default -l "app=prometheus,component=server" -o jsonpath="{.items[0].metadata.name}")
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kubectl --namespace default port-forward $POD_NAME 9090
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```
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You can access the Prometheus Alertmanager via port 80 on this DNS name from within your cluster:
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```
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`prometheus-alertmanager.default.svc.cluster.local`
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```
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Get the Alertmanager URL by running these commands in the same shell:
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```
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export POD_NAME=$(kubectl get pods --namespace default -l "app=prometheus,component=alertmanager" -o jsonpath="{.items[0].metadata.name}")
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kubectl --namespace default port-forward $POD_NAME 9093
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#################################################################################
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###### WARNING: Pod Security Policy has been moved to a global property. #####
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###### use .Values.podSecurityPolicy.enabled with pod-based #####
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###### annotations #####
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###### (e.g. .Values.nodeExporter.podSecurityPolicy.annotations) #####
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#################################################################################
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```
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You can access the Prometheus PushGateway via port 9091 on this DNS name from within your cluster:
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```
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`prometheus-pushgateway.default.svc.cluster.local`
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```
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Get the PushGateway URL by running these commands in the same shell:
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```
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export POD_NAME=$(kubectl get pods --namespace default -l "app=prometheus,component=pushgateway" -o jsonpath="{.items[0].metadata.name}")
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kubectl --namespace default port-forward $POD_NAME 9091
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For more information on running Prometheus, visit:
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<https://prometheus.io/>
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```
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Check to confirm your pods are running:
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```
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$ kubectl get pods -n default
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NAME READY STATUS RESTARTS AGE
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prometheus-alertmanager-ccf8f68cd-hcrqr 2/2 Running 0 3m22s
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prometheus-kube-state-metrics-685b975bb7-mhv54 1/1 Running 0 3m22s
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prometheus-node-exporter-mfcwj 1/1 Running 0 3m22s
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prometheus-pushgateway-74cb65b858-7ffhs 1/1 Running 0 3m22s
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prometheus-server-d9fb67455-2g2jw 2/2 Running 0 3m22s
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```
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Next, expose your port on the Prometheus server pod so that you can see the Prometheus web interface. To do this, you need the service name and port. You also need to come up with a name to open the service using the Minikube service command.
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Get the service name for `prometheus-server`:
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```
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$ kubectl get svc -n default
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NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 13m
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prometheus-alertmanager ClusterIP 10.106.68.12 <none> 80/TCP 8m22s
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prometheus-kube-state-metrics ClusterIP 10.104.167.239 <none> 8080/TCP 8m22s
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prometheus-node-exporter ClusterIP None <none> 9100/TCP 8m22s
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prometheus-pushgateway ClusterIP 10.99.90.233 <none> 9091/TCP 8m22s
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prometheus-server ClusterIP 10.103.195.104 <none> 9090/TCP 8m22s
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```
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Expose the service as type `Node-port`. Provide a target port of `9090` and a name you want to call the server. The node port is the server listening port. This is an extract of the Helm chart:
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```
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## Port for Prometheus Service to listen on
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##
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port: 9090
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```
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The command is:
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```
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$ kubectl expose service prometheus-server --type=NodePort --target-port=9090 --name=prom-server
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service/prom-server exposed
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```
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Next, you need Minikube to open the service and browser:
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```
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jess@Athena:~$ minikube service prom-server
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|-----------|-------------|-------------|---------------------------|
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| NAMESPACE | NAME | TARGET PORT | URL |
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|-----------|-------------|-------------|---------------------------|
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| default | prom-server | 80 | <http://192.168.49.2:32169> |
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|-----------|-------------|-------------|---------------------------|
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🎉 Opening service default/prom-server in default browser...
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```
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Your browser should open and show you the Prometheus service.
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![Prometheus interface][7]
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(Jess Cherry, [CC BY-SA 4.0][8])
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Congratulations! You now have Prometheus installed on your cluster.
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### Install Grafana
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Next, install Grafana and configure it to work with Prometheus. Follow the steps below to expose a service to configure Grafana and collect data from Prometheus to gather your steady state.
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Start with getting your Helm chart:
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```
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$ helm repo add grafana <https://grafana.github.io/helm-charts>
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"grafana" has been added to your repositories
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```
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Search for your chart:
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```
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$ helm search repo grafana
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NAME CHART VERSION APP VERSION DESCRIPTION
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bitnami/grafana 5.2.11 7.5.5 Grafana is an open source, feature rich metrics...
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bitnami/grafana-operator 0.6.5 3.10.0 Kubernetes Operator based on the Operator SDK f...
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grafana/grafana 6.9.0 7.5.5 The leading tool for querying and visualizing t...
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stable/grafana 5.5.7 7.1.1 DEPRECATED - The leading tool for querying and ...
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```
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Since stable/grafana is depreciated, install bitnami/grafana. Then install your chart:
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```
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helm install grafana bitnami/grafana
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NAME: grafana
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LAST DEPLOYED: Sun May 9 12:09:53 2021
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NAMESPACE: default
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STATUS: deployed
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REVISION: 1
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TEST SUITE: None
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NOTES:
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** Please be patient while the chart is being deployed **
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```
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1. Get the application URL by running: [code] echo "Browse to <http://127.0.0.1:8080>"
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kubectl port-forward svc/grafana 8080:3000 &
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```
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2. Get the admin credentials: [code] echo "User: admin"
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echo "Password: $(kubectl get secret grafana-admin --namespace default -o jsonpath="{.data.GF_SECURITY_ADMIN_PASSWORD}" | base64 --decode)"
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```
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As you can see in the Helm installation output, the target port for Grafana is 3000, so you will use that port for exposing the service to see Grafana's web frontend. Before exposing the service, confirm your services are running:
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```
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$ kubectl get pods -A
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NAMESPACE NAME READY STATUS RESTARTS AGE
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default grafana-6b84bbcd8f-xt6vd 1/1 Running 0 4m21s
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```
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Expose the service:
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```
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$ kubectl expose service grafana --type=NodePort --target-port=3000 --name=grafana-server
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service/grafana-server exposed
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```
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Enable the service to open a browser with a Minikube service:
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```
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jess@Athena:~$ minikube service grafana-server
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|-----------|----------------|-------------|---------------------------|
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| NAMESPACE | NAME | TARGET PORT | URL |
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|-----------|----------------|-------------|---------------------------|
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| default | grafana-server | 3000 | <http://192.168.49.2:30549> |
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|-----------|----------------|-------------|---------------------------|
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🎉 Opening service default/grafana-server in default browser...
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```
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You will see the welcome screen where you can log in.
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![Grafana welcome screen][9]
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(Jess Cherry, [CC BY-SA 4.0][8])
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Set up credentials to log into Grafana using kubectl. The commands appeared in the installation's output; here are the commands in use:
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```
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$ echo "User: admin"
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User: admin
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$ echo "Password: $(kubectl get secret grafana-admin --namespace default -o jsonpath="{.data.GF_SECURITY_ADMIN_PASSWORD}" | base64 --decode)"
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Password: G6U5VeAejt
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```
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Log in with your new credentials, and you will see the Grafana dashboard.
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![Grafana dashboard][10]
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(Jess Cherry, [CC BY-SA 4.0][8])
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Congratulations! You now have a working Grafana installation in your Minikube cluster with the ability to log in. The next step is to configure Grafana to work with Prometheus to gather data and show your steady state.
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### Configure Grafana with Prometheus
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Now that you can log in to your Grafana instance, you need to set up the data collection and dashboard. Since this is an entirely web-based configuration, I will go through the setup using screenshots. Start by adding your Prometheus data collection. Click the **gear icon** on the left-hand side of the display to open the **Configuration** settings, then select **Data Source**.
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![Configure data source option][11]
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(Jess Cherry, [CC BY-SA 4.0][8])
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On the next screen, click **Add data source**.
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![Add data source option][12]
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(Jess Cherry, [CC BY-SA 4.0][8])
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Select **Prometheus**.
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![Select Prometheus data source][13]
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(Jess Cherry, [CC BY-SA 4.0][8])
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Because you configured your Prometheus instance to be exposed on port 80, use the service name **prometheus-server** and the server **port 80**.
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![Configuring Prometheus data source][14]
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(Jess Cherry, [CC BY-SA 4.0][8])
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Save and test your new data source by scrolling to the bottom of the screen and clicking **Save and Test**. You should see a green banner that says **Data source is working**.
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![Confirming Data source is working][15]
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(Jess Cherry, [CC BY-SA 4.0][8])
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Return to the top of the page and click **Dashboards**.
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![Select Dashboards option][16]
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(Jess Cherry, [CC BY-SA 4.0][8])
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Import all three dashboard options.
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![Import three dashboards][17]
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(Jess Cherry, [CC BY-SA 4.0][8])
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Click the **magnifying glass** icon on the left-hand side to confirm all three dashboards have been imported.
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![Confirming dashboard import][18]
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(Jess Cherry, [CC BY-SA 4.0][8])
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Now that everything is configured, click **Prometheus 2.0 Stats**, and you should see something similar to this.
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![Prometheus 2.0 Stats][19]
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(Jess Cherry, [CC BY-SA 4.0][8])
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Congratulations! You have a set up basic data collection from Prometheus about your cluster.
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### Import more monitoring dashboards
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You can import additional detailed dashboards from Grafana Labs' [community dashboards][20] collection. I picked two of my favorites, [Dash-minikube][21] and [Kubernetes Cluster Monitoring][22], for this quick walkthrough.
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To import a dashboard, you need its ID from the dashboards collection. First, click the plus (**+**) sign on the left-hand side to create a dashboard, then click **Import** in the dropdown list, and enter the ID. For Dash-minikube, it's ID 10219.
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![Import Dash-minikube dashboard][23]
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(Jess Cherry, [CC BY-SA 4.0][8])
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![Import Dash-minikube dashboard][24]
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(Jess Cherry, [CC BY-SA 4.0][8])
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Click **Load**, and enter the data source on the next screen. Since this uses Prometheus, enter your Prometheus data source.
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|
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![Import Dash-minikube][25]
|
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|
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(Jess Cherry, [CC BY-SA 4.0][8])
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|
||||||
|
Click **Import**, and the new dashboard will appear.
|
||||||
|
|
||||||
|
![Import Dash-minikube dashboard][26]
|
||||||
|
|
||||||
|
(Jess Cherry, [CC BY-SA 4.0][8])
|
||||||
|
|
||||||
|
Now you have a new dashboard to keep track of your Minikube stats. If you follow the same steps using Kubernetes Cluster Monitoring (ID 2115), you will see a more verbose monitoring dashboard.
|
||||||
|
|
||||||
|
![Kubernetes Cluster Monitoring dashboard][27]
|
||||||
|
|
||||||
|
(Jess Cherry, [CC BY-SA 4.0][8])
|
||||||
|
|
||||||
|
Now you can keep track of your steady state with Grafana and Prometheus data collections and visuals.
|
||||||
|
|
||||||
|
### Final thoughts
|
||||||
|
|
||||||
|
With these open source tools, you can collect your cluster's steady state and maintain a good pulse on it. This is important in chaos engineering because it allows you to check everything in a destructive, unstable state and use that data to test your hypothesis about what could happen to its state during an outage.
|
||||||
|
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|
--------------------------------------------------------------------------------
|
||||||
|
|
||||||
|
via: https://opensource.com/article/21/6/chaos-grafana-prometheus
|
||||||
|
|
||||||
|
作者：[Jessica Cherry][a]
|
||||||
|
选题：[lujun9972][b]
|
||||||
|
译者：[译者ID](https://github.com/译者ID)
|
||||||
|
校对：[校对者ID](https://github.com/校对者ID)
|
||||||
|
|
||||||
|
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||||
|
|
||||||
|
[a]: https://opensource.com/users/cherrybomb
|
||||||
|
[b]: https://github.com/lujun9972
|
||||||
|
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/ship_wheel_gear_devops_kubernetes.png?itok=xm4a74Kv (A ship wheel with someone steering)
|
||||||
|
[2]: https://opensource.com/article/21/5/11-years-kubernetes-and-chaos
|
||||||
|
[3]: https://opensource.com/article/19/11/introduction-monitoring-prometheus
|
||||||
|
[4]: htpp://grafana.com
|
||||||
|
[5]: https://minikube.sigs.k8s.io/docs/start/
|
||||||
|
[6]: http://prometheus.io
|
||||||
|
[7]: https://opensource.com/sites/default/files/uploads/prometheus-interface.png (Prometheus interface)
|
||||||
|
[8]: https://creativecommons.org/licenses/by-sa/4.0/
|
||||||
|
[9]: https://opensource.com/sites/default/files/uploads/grafana_welcome.png (Grafana welcome screen)
|
||||||
|
[10]: https://opensource.com/sites/default/files/uploads/grafana_dashboard.png (Grafana dashboard)
|
||||||
|
[11]: https://opensource.com/sites/default/files/uploads/grafana_datasource.png (Configure data source option)
|
||||||
|
[12]: https://opensource.com/sites/default/files/uploads/grafana_adddatasource.png (Add data source option)
|
||||||
|
[13]: https://opensource.com/sites/default/files/uploads/grafana_prometheusdatasource.png (Select Prometheus data source)
|
||||||
|
[14]: https://opensource.com/sites/default/files/uploads/grafana_configureprometheusdatasource.png (Configuring Prometheus data source)
|
||||||
|
[15]: https://opensource.com/sites/default/files/uploads/datasource_save-test.png (Confirming Data source is working)
|
||||||
|
[16]: https://opensource.com/sites/default/files/uploads/dashboards.png (Select Dashboards option)
|
||||||
|
[17]: https://opensource.com/sites/default/files/uploads/importdatasources.png (Import three dashboards)
|
||||||
|
[18]: https://opensource.com/sites/default/files/uploads/importeddashboard.png (Confirming dashboard import)
|
||||||
|
[19]: https://opensource.com/sites/default/files/uploads/prometheus2stats.png (Prometheus 2.0 Stats)
|
||||||
|
[20]: https://grafana.com/grafana/dashboards
|
||||||
|
[21]: https://grafana.com/grafana/dashboards/10219
|
||||||
|
[22]: https://grafana.com/grafana/dashboards/2115
|
||||||
|
[23]: https://opensource.com/sites/default/files/uploads/importdashminikube.png (Import Dash-minikube dashboard)
|
||||||
|
[24]: https://opensource.com/sites/default/files/uploads/importdashminikube2.png (Import Dash-minikube dashboard)
|
||||||
|
[25]: https://opensource.com/sites/default/files/uploads/importdashminikube3.png (Import Dash-minikube)
|
||||||
|
[26]: https://opensource.com/sites/default/files/uploads/importdashminikube4.png (Import Dash-minikube dashboard)
|
||||||
|
[27]: https://opensource.com/sites/default/files/uploads/kubernetesclustermonitoring-dashboard.png (Kubernetes Cluster Monitoring dashboard)
|
||||||
Loading…
Reference in New Issue
Block a user