Kubernetes : Deploy Prometheus2023/10/23 |
Deploy Prometheus to monitor metrics in Kubernetes Cluster. This example is based on the environment like follows. +----------------------+ +----------------------+ | [ mgr.srv.world ] | | [ dlp.srv.world ] | | Manager Node | | Control Plane | +-----------+----------+ +-----------+----------+ eth0|10.0.0.25 eth0|10.0.0.30 | | ------------+--------------------------+----------- | | eth0|10.0.0.51 eth0|10.0.0.52 +-----------+----------+ +-----------+----------+ | [ node01.srv.world ] | | [ node02.srv.world ] | | Worker Node#1 | | Worker Node#2 | +----------------------+ +----------------------+ |
[1] |
Persistent storage is needed for Prometheus.
On this example, configure [nfs.srv.world:/home/nfsshare] directory on NFS server as external storage, and also configure dynamic volume provisioning with NFS plugin like the example [1], [2], [3] of here. |
[2] | Install Prometheus chart with Helm. |
# output config and change some settings [root@mgr ~]# helm inspect values bitnami/kube-prometheus > prometheus.yaml
[root@mgr ~]#
vi prometheus.yaml ..... ..... line 21 : specify [storageClass] to use storageClass: "nfs-client" ..... ..... ..... line 1058 : specify [storageClass] to use storageClass: "nfs-client" ..... ..... ..... line 2036 : specify [storageClass] to use storageClass: "nfs-client" # create a namespace for Prometheus [root@mgr ~]# kubectl create namespace monitoring namespace/monitoring created helm install prometheus --namespace monitoring -f prometheus.yaml bitnami/kube-prometheus NAME: prometheus LAST DEPLOYED: Mon Oct 23 10:33:45 2023 NAMESPACE: monitoring STATUS: deployed REVISION: 1 TEST SUITE: None NOTES: CHART NAME: kube-prometheus CHART VERSION: 8.21.6 APP VERSION: 0.68.0 ** Please be patient while the chart is being deployed ** Watch the Prometheus Operator Deployment status using the command: kubectl get deploy -w --namespace monitoring -l app.kubernetes.io/name=kube-prometheus-operator,app.kubernetes.io/instance=prometheus Watch the Prometheus StatefulSet status using the command: kubectl get sts -w --namespace monitoring -l app.kubernetes.io/name=kube-prometheus-prometheus,app.kubernetes.io/instance=prometheus Prometheus can be accessed via port "9090" on the following DNS name from within your cluster: prometheus-kube-prometheus-prometheus.monitoring.svc.cluster.local To access Prometheus from outside the cluster execute the following commands: echo "Prometheus URL: http://127.0.0.1:9090/" kubectl port-forward --namespace monitoring svc/prometheus-kube-prometheus-prometheus 9090:9090 Watch the Alertmanager StatefulSet status using the command: kubectl get sts -w --namespace monitoring -l app.kubernetes.io/name=kube-prometheus-alertmanager,app.kubernetes.io/instance=prometheus Alertmanager can be accessed via port "9093" on the following DNS name from within your cluster: prometheus-kube-prometheus-alertmanager.monitoring.svc.cluster.local To access Alertmanager from outside the cluster execute the following commands: echo "Alertmanager URL: http://127.0.0.1:9093/" kubectl port-forward --namespace monitoring svc/prometheus-kube-prometheus-alertmanager 9093:9093[root@mgr ~]# kubectl get pods -n monitoring NAME READY STATUS RESTARTS AGE alertmanager-prometheus-kube-prometheus-alertmanager-0 2/2 Running 0 2m8s prometheus-kube-prometheus-blackbox-exporter-586779659-72cst 1/1 Running 0 2m24s prometheus-kube-prometheus-operator-74675d8559-dlzk8 1/1 Running 0 2m24s prometheus-kube-state-metrics-7769f89694-ggdbz 1/1 Running 0 2m24s prometheus-node-exporter-9vgbw 1/1 Running 0 2m24s prometheus-node-exporter-gdkjc 1/1 Running 0 2m24s prometheus-prometheus-kube-prometheus-prometheus-0 2/2 Running 0 2m8s # if access from outside of cluster, set port-forwarding [root@mgr ~]# kubectl port-forward -n monitoring service/prometheus-kube-prometheus-prometheus --address 0.0.0.0 9090:9090 & |
[3] | If you deploy Grafana, too, It's possible like follows. |
# output config and change some settings [root@mgr ~]# helm inspect values bitnami/grafana > grafana.yaml
[root@mgr ~]#
vi grafana.yaml # line 558 : change to your [storageClass] persistence: enabled: true ## If defined, storageClassName: <storageClass> ## If set to "-", storageClassName: "", which disables dynamic provisioning ## If undefined (the default) or set to null, no storageClassName spec is ## set, choosing the default provisioner. (gp2 on AWS, standard on ## GKE, AWS & OpenStack) ## storageClass: "nfs-client"[root@mgr ~]# helm install grafana --namespace monitoring -f grafana.yaml bitnami/grafana NAME: grafana LAST DEPLOYED: Mon Oct 23 10:38:58 2023 NAMESPACE: monitoring STATUS: deployed REVISION: 1 TEST SUITE: None NOTES: CHART NAME: grafana CHART VERSION: 9.3.2 APP VERSION: 10.1.5 ** Please be patient while the chart is being deployed ** 1. Get the application URL by running these commands: echo "Browse to http://127.0.0.1:8080" kubectl port-forward svc/grafana 8080:3000 & 2. Get the admin credentials: echo "User: admin" echo "Password: $(kubectl get secret grafana-admin --namespace monitoring -o jsonpath="{.data.GF_SECURITY_ADMIN_PASSWORD}" | base64 -d)"[root@mgr ~]# kubectl get pods -n monitoring NAME READY STATUS RESTARTS AGE alertmanager-prometheus-kube-prometheus-alertmanager-0 2/2 Running 0 5m50s grafana-6d54c5d759-gk9dn 1/1 Running 0 54s prometheus-kube-prometheus-blackbox-exporter-586779659-72cst 1/1 Running 0 6m6s prometheus-kube-prometheus-operator-74675d8559-dlzk8 1/1 Running 0 6m6s prometheus-kube-state-metrics-7769f89694-ggdbz 1/1 Running 0 6m6s prometheus-node-exporter-9vgbw 1/1 Running 0 6m6s prometheus-node-exporter-gdkjc 1/1 Running 0 6m6s prometheus-prometheus-kube-prometheus-prometheus-0 2/2 Running 0 5m50s # if access from outside of cluster, set port-forwarding [root@mgr ~]# kubectl port-forward -n monitoring service/grafana --address 0.0.0.0 3000:3000 & |
[4] |
If you access to Prometheus UI from a Host in cluster, access to the URL below with an Web browser.
⇒ http://prometheus-kube-prometheus-prometheus.monitoring.svc.cluster.local
If you set port-forwarding, access to the URL below on a client computer in your local network.
⇒ http://(Manager Node Hostname or IP address):(setting port)/
That's OK if following Prometheus UI is displayed.
|
[5] |
If you access to Grafana from a Host in cluster, access to the URL below with an Web browser.
⇒ http://grafana.monitoring.svc.cluster.local
If you set port-forwarding, access to the URL below on a client computer in your local network.
⇒ http://(Manager Node Hostname or IP address):(setting port)/
That's OK if following Grafana UI is displayed.
For [admin] password, it's possible to confirm with the command below.⇒ echo "Password: $(kubectl get secret grafana-admin --namespace monitoring -o jsonpath="{.data.GF_SECURITY_ADMIN_PASSWORD}" | base64 -d)" |
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