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318 lines
12 KiB
Markdown
318 lines
12 KiB
Markdown
# Getting started with VM Operator
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**The guide covers:**
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* The setup of a [VM Operator](https://github.com/VictoriaMetrics/helm-charts/tree/master/charts/victoria-metrics-operator) via Helm in [Kubernetes](https://kubernetes.io/) with Helm charts.
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* The setup of a [VictoriaMetrics Cluster](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html) via [VM Operator](https://github.com/VictoriaMetrics/helm-charts/tree/master/charts/victoria-metrics-operator).
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* How to add CRD for a [VictoriaMetrics Cluster](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html) via [VM Operator](https://github.com/VictoriaMetrics/helm-charts/tree/master/charts/victoria-metrics-operator).
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* How to visualize stored data
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* How to store metrics in [VictoriaMetrics](https://victoriametrics.com)
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**Preconditions**
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* [Kubernetes cluster 1.20.9-gke.1001](https://cloud.google.com/kubernetes-engine). We use a GKE cluster from [GCP](https://cloud.google.com/) but this guide also applies to any Kubernetes cluster. For example, [Amazon EKS](https://aws.amazon.com/ru/eks/).
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* [Helm 3](https://helm.sh/docs/intro/install).
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* [kubectl 1.21+](https://kubernetes.io/docs/tasks/tools/install-kubectl).
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## 1. VictoriaMetrics Helm repository
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See how to work with a [VictoriaMetrics Helm repository in previous guide](https://docs.victoriametrics.com/guides/k8s-monitoring-via-vm-cluster.html#1-victoriametrics-helm-repository).
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## 2. Install the VM Operator from the Helm chart
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<div class="with-copy" markdown="1">
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```console
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helm install vmoperator vm/victoria-metrics-operator
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```
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</div>
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The expected output is:
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```console
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NAME: vmoperator
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LAST DEPLOYED: Thu Sep 30 17:30:30 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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victoria-metrics-operator has been installed. Check its status by running:
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kubectl --namespace default get pods -l "app.kubernetes.io/instance=vmoperator"
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Get more information on https://github.com/VictoriaMetrics/helm-charts/tree/master/charts/victoria-metrics-operator.
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See "Getting started guide for VM Operator" on https://docs.victoriametrics.com/guides/getting-started-with-vm-operator.html.
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```
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Run the following command to check that VM Operator is up and running:
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<div class="with-copy" markdown="1">
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```console
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kubectl --namespace default get pods -l "app.kubernetes.io/instance=vmoperator"
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```
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</div>
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The expected output:
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```console
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NAME READY STATUS RESTARTS AGE
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vmoperator-victoria-metrics-operator-67cff44cd6-s47n6 1/1 Running 0 77s
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```
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## 3. Install VictoriaMetrics Cluster
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> For this example we will use default value for `name: example-vmcluster-persistent`. Change it value up to your needs.
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Run the following command to install [VictoriaMetrics Cluster](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html) via [VM Operator](https://github.com/VictoriaMetrics/helm-charts/tree/master/charts/victoria-metrics-operator):
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<div class="with-copy" markdown="1" id="example-cluster-config">
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```console
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cat << EOF | kubectl apply -f -
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apiVersion: operator.victoriametrics.com/v1beta1
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kind: VMCluster
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metadata:
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name: example-vmcluster-persistent
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spec:
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# Add fields here
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retentionPeriod: "12"
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vmstorage:
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replicaCount: 2
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vmselect:
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replicaCount: 2
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vminsert:
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replicaCount: 2
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EOF
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```
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</div>
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The expected output:
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```console
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vmcluster.operator.victoriametrics.com/example-vmcluster-persistent created
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```
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* By applying this CRD we install the [VictoriaMetrics cluster](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html) to the default [namespace](https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/) of your k8s cluster with following params:
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* `retentionPeriod: "12"` defines the [retention](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#retention) to 12 months.
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* `replicaCount: 2` creates two replicas of vmselect, vminsert and vmstorage.
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Please note that it may take some time for the pods to start. To check that the pods are started, run the following command:
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<div class="with-copy" markdown="1" id="example-cluster-config">
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```console
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kubectl get pods | grep vmcluster
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```
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</div>
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The expected output:
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```console
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NAME READY STATUS RESTARTS AGE
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vminsert-example-vmcluster-persistent-845849cb84-9vb6f 1/1 Running 0 5m15s
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vminsert-example-vmcluster-persistent-845849cb84-r7mmk 1/1 Running 0 5m15s
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vmselect-example-vmcluster-persistent-0 1/1 Running 0 5m21s
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vmselect-example-vmcluster-persistent-1 1/1 Running 0 5m21s
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vmstorage-example-vmcluster-persistent-0 1/1 Running 0 5m25s
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vmstorage-example-vmcluster-persistent-1 1/1 Running 0 5m25s
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```
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There is an extra command to get information about the cluster state:
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<div class="with-copy" markdown="1" id="services">
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```console
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kubectl get vmclusters
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```
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</div>
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The expected output:
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```console
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NAME INSERT COUNT STORAGE COUNT SELECT COUNT AGE STATUS
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example-vmcluster-persistent 2 2 2 5m53s operational
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```
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Internet traffic goes through the Kubernetes Load balancer which use the set of Pods targeted by a [Kubernetes Service](https://kubernetes.io/docs/concepts/services-networking/service/). The service in [VictoriaMetrics Cluster architecture](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#architecture-overview) which accepts the ingested data named `vminsert` and in Kubernetes it is a `vminsert ` service. So we need to use it for remote_write url.
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To get the name of `vminsert` services, please run the following command:
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<div class="with-copy" markdown="1" id="services">
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```console
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kubectl get svc | grep vminsert
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```
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</div>
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The expected output:
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```console
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vminsert-example-vmcluster-persistent ClusterIP 10.107.47.136 <none> 8480/TCP 5m58s
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```
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To scrape metrics from Kubernetes with a VictoriaMetrics Cluster we will need to install [VMAgent](https://docs.victoriametrics.com/vmagent.html) with some additional configurations.
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Copy `vminsert-example-vmcluster-persistent` (or whatever user put into metadata.name field [https://docs.victoriametrics.com/guides/getting-started-with-vm-operator.html#example-cluster-config](https://docs.victoriametrics.com/guides/getting-started-with-vm-operator.html#example-cluster-config)) service name and add it to the `remoteWrite` URL from [quick-start example](https://github.com/VictoriaMetrics/operator/blob/master/docs/quick-start.MD#vmagent).
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Here is an example of the full configuration that we need to apply:
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<div class="with-copy" markdown="1">
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```console
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cat <<EOF | kubectl apply -f -
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apiVersion: operator.victoriametrics.com/v1beta1
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kind: VMAgent
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metadata:
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name: example-vmagent
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spec:
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serviceScrapeNamespaceSelector: {}
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podScrapeNamespaceSelector: {}
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podScrapeSelector: {}
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serviceScrapeSelector: {}
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nodeScrapeSelector: {}
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nodeScrapeNamespaceSelector: {}
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staticScrapeSelector: {}
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staticScrapeNamespaceSelector: {}
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replicaCount: 1
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remoteWrite:
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- url: "http://vminsert-example-vmcluster-persistent.default.svc.cluster.local:8480/insert/0/prometheus/api/v1/write"
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EOF
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```
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</div>
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The expected output:
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```console
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vmagent.operator.victoriametrics.com/example-vmagent created
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```
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>`remoteWrite.url` for VMAgent consists of the following parts:
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> "service_name.VMCluster_namespace.svc.kubernetes_cluster_domain" that in our case will look like vminsert-example-vmcluster-persistent.default.svc.cluster.local
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Verify that `VMAgent` is up and running by executing the following command:
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<div class="with-copy" markdown="1">
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```console
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kubectl get pods | grep vmagent
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```
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</div>
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The expected output is:
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```console
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vmagent-example-vmagent-7996844b5f-b5rzs 2/2 Running 0 9s
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```
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> There are two containers for VMagent: the first one is a VMagent and the second one is a sidecard with a secret. VMagent use a secret with configuration wich is mounted to the special sidecar. It observes the changes with configuration and send a signal to reload configuration for the VMagent.
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Run the following command to make `VMAgent`'s port accessible from the local machine:
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<div class="with-copy" markdown="1">
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</div>
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```console
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kubectl port-forward svc/vmagent-example-vmagent 8429:8429
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```
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The expected output is:
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```console
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Forwarding from 127.0.0.1:8429 -> 8429
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Forwarding from [::1]:8429 -> 8429
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```
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To check that `VMAgent` collects metrics from the k8s cluster open in the browser [http://127.0.0.1:8429/targets](http://127.0.0.1:8429/targets) .
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You will see something like this:
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<p align="center">
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<img src="guide-vmcluster-k8s-via-vm-operator.png" width="800" alt="">
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</p>
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`VMAgent` connects to [kubernetes service discovery](https://kubernetes.io/docs/concepts/services-networking/service/) and gets targets which needs to be scraped. This service discovery is controlled by [VictoriaMetrics Operator](https://github.com/VictoriaMetrics/operator)
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## 4. Verifying VictoriaMetrics cluster
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See [how to install and connect Grafana to VictoriaMetrics](https://docs.victoriametrics.com/guides/k8s-monitoring-via-vm-cluster.html#4-install-and-connect-grafana-to-victoriametrics-with-helm) but with one addition - we should get the name of `vmselect` service from the freshly installed VictoriaMetrics Cluster because it will now be different.
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To get the new service name, please run the following command:
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<div class="with-copy" markdown="1" id="services">
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```console
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kubectl get svc | grep vmselect
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```
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</div>
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The expected output:
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```console
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vmselect-example-vmcluster-persistent ClusterIP None <none> 8481/TCP 7m
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```
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The final config will look like this:
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<div class="with-copy" markdown="1">
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```yaml
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cat <<EOF | helm install my-grafana grafana/grafana -f -
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datasources:
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datasources.yaml:
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apiVersion: 1
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datasources:
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- name: victoriametrics
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type: prometheus
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orgId: 1
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url: http://vmselect-example-vmcluster-persistent.default.svc.cluster.local:8481/select/0/prometheus/
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access: proxy
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isDefault: true
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updateIntervalSeconds: 10
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editable: true
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dashboardProviders:
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dashboardproviders.yaml:
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apiVersion: 1
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providers:
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- name: 'default'
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orgId: 1
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folder: ''
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type: file
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disableDeletion: true
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editable: true
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options:
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path: /var/lib/grafana/dashboards/default
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dashboards:
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default:
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victoriametrics:
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gnetId: 11176
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revision: 18
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datasource: victoriametrics
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vmagent:
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gnetId: 12683
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revision: 7
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datasource: victoriametrics
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kubernetes:
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gnetId: 14205
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revision: 1
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datasource: victoriametrics
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EOF
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```
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</div>
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## 5. Check the result you obtained in your browser
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To check that [VictoriaMetrics](https://victoriametrics.com) collecting metrics from the k8s cluster open in your browser [http://127.0.0.1:3000/dashboards](http://127.0.0.1:3000/dashboards) and choose the `VictoriaMetrics - cluster` dashboard. Use `admin` for login and the `password` that you previously got from kubectl.
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<p align="center">
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<img src="guide-vmcluster-k8s-via-vm-operator-grafana1.png" width="800" alt="grafana dashboards">
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</p>
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The expected output is:
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<p align="center">
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<img src="guide-vmcluster-k8s-via-vm-operator-grafana2.png" width="800" alt="grafana dashboards">
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</p>
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## 6. Summary
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* We set up Kubernetes Operator for VictoriaMetrics with using CRD.
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* We collected metrics from all running services and stored them in the VictoriaMetrics database.
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