VictoriaMetrics/docs/operator/quick-start.md

---
sort: 9
---

#  Quick start

Operator serves to make running VictoriaMetrics applications on top of Kubernetes as easy as possible while preserving Kubernetes-native configuration options.

## Installing by Manifest

Obtain release from releases page:
[https://github.com/VictoriaMetrics/operator/releases](https://github.com/VictoriaMetrics/operator/releases)

 We suggest use the latest release. 

```console
# Get latest release version from https://github.com/VictoriaMetrics/operator/releases/latest
export VM_VERSION=`basename $(curl -fs -o/dev/null -w %{redirect_url} https://github.com/VictoriaMetrics/operator/releases/latest)`
wget https://github.com/VictoriaMetrics/operator/releases/download/$VM_VERSION/bundle_crd.zip
unzip  bundle_crd.zip 
```

> TIP, operator use monitoring-system namespace, but you can install it to specific namespace with command
> sed -i "s/namespace: monitoring-system/namespace: YOUR_NAMESPACE/g" release/operator/*

First of all, you  have to create [custom resource definitions](https://github.com/VictoriaMetrics/operator)
```console
kubectl apply -f release/crds
```
 
Then you need RBAC for operator, relevant configuration for the release can be found at release/operator/rbac.yaml

Change configuration for operator at `release/operator/manager.yaml`, possible settings: [operator-settings](/vars.MD)
and apply it:
```console
kubectl apply -f release/operator/
```

Check the status of operator

```console
kubectl get pods -n monitoring-system

#NAME                           READY   STATUS    RESTARTS   AGE
#vm-operator-667dfbff55-cbvkf   1/1     Running   0          101s

```


## Installing by Kustomize

You can install operator using [Kustomize](https://kustomize.io/) by pointing to the remote kustomization file.

```yaml
# Get latest release version from https://github.com/VictoriaMetrics/operator/releases/latest
export VM_VERSION=`basename $(curl -fs -o/dev/null -w %{redirect_url} https://github.com/VictoriaMetrics/operator/releases/latest)`

cat << EOF > kustomization.yaml
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
resources:
- github.com/VictoriaMetrics/operator/config/default?ref=${VM_VERSION}

images:
- name: victoriametrics/operator
  newTag: ${VM_VERSION}
EOF
```


You can change [operator-settings](/vars.MD), or use your custom namespace see [kustomize-example](https://github.com/YuriKravetc/yurikravetc.github.io/tree/main/Operator/kustomize-example).



Build template

```console
kustomize build . -o monitoring.yaml
```

Apply manifests

```console
kubectl apply -f monitoring.yaml
```

Check the status of operator

```console
kubectl get pods -n monitoring-system

#NAME                           READY   STATUS    RESTARTS   AGE
#vm-operator-667dfbff55-cbvkf   1/1     Running   0          101s

```

## Installing to ARM

 There is no need in an additional configuration for ARM. Operator and VictoriaMetrics have full support for it.

## Create related resources

The VictoriaMetrics Operator introduces additional resources in Kubernetes to declare the desired state of a Victoria Metrics applications and Alertmanager cluster as well as the Prometheus resources configuration. The resources it introduces are:

* [VMSingle](#vmsingle)
* [VMCluster](#vmcluster)
* [VMAgent](#vmagent)
* [VMAlert](#vmalert)
* [VMAlertmanager](#vmalertmanager)
* [VMServiceScrape](#vmservicescrape)
* [VMRule](#vmrule)
* [VMPodScrape](#vmpodscrape)
* [VMProbe](#vmprobe)
* [VMStaticScrape](#vmstaticscrape)
* [VMAuth](#vmauth)
* [VMUser](#vmuser)
* [Selectors](#object-selectors)

## VMSingle

[VMSingle](https://github.com/VictoriaMetrics/VictoriaMetrics/) represents database for storing metrics, for all possible config options check api [doc](https://docs.victoriametrics.com/operator/api.html#vmsingle):
 
```yaml
cat <<EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMSingle
metadata:
  name: example-vmsingle-persisted
spec:
  retentionPeriod: "1"
  removePvcAfterDelete: true
  storage:
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: 1Gi      
EOF
```

Configuration can be extended with extraFlags and extraEnv, check flag documentation at [doc](https://github.com/VictoriaMetrics/VictoriaMetrics/blob/master/docs/Single-server-VictoriaMetrics.md)
for instance:

```yaml
cat <<EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMSingle
metadata:
  name: example-vmsingle-persisted
spec:
  retentionPeriod: "1"
  extraArgs:
    dedup.minScrapeInterval: 60s
EOF
```

Flag can be replaced with envVar, it's useful for retrieving value from secret:

```yaml
cat <<EOF | kubectl apply -f  -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMSingle
metadata:
  name: example-vmsingle-persisted
spec:
  retentionPeriod: "1"
  extraEnvs:
    - name: DEDUP_MINSCRAPEINTERVAL
      valueFrom: 
        secretKeyRef:
           name: vm-secret
           key: dedup
EOF
```

## VMCluster

[VMCluster](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/cluster) represent a high-available and fault-tolerant version of VictoriaMetrics database.
For minimal version without persistent create simple custom resource definition:
 
```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMCluster
metadata:
  name: example-vmcluster
spec:
  # Add fields here
  retentionPeriod: "1"
  vmstorage:
    replicaCount: 2
  vmselect:
    replicaCount: 2
  vminsert:
    replicaCount: 2
EOF
```

For persistent it recommends adding persistent storage to `vmstorage` and `vmselect`:

```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMCluster
metadata:
  name: example-vmcluster-persistent
spec:
  # Add fields here
  retentionPeriod: "4"
  replicationFactor: 2
  vmstorage:
    replicaCount: 2
    storageDataPath: "/vm-data"
    storage:
      volumeClaimTemplate:
        spec:
          storageClassName: standard
          resources:
            requests:
              storage: 10Gi
    resources:
      limits:
        cpu: "0.5"
        memory: 500Mi
  vmselect:
    replicaCount: 2
    cacheMountPath: "/select-cache"
    storage:
      volumeClaimTemplate:
        spec:
          resources:
            requests:
              storage: 2Gi
    resources:
      limits:
        cpu: "0.3"
        memory: "300Mi"
  vminsert:
    replicaCount: 2
EOF
```

You may also create cluster version with external vmstorage

```yaml
cat << EOF | kubectl apply -f -
---
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMCluster
metadata:
  name: example-vmcluster
spec:
  # Add fields here
  retentionPeriod: "1"
  vmselect:
    replicaCount: 2
    extraArgs:
       storageNode: "node-1:8401,node-2:8401"
  vminsert:
    replicaCount: 2
    extraArgs:
       storageNode: "node-1:8401,node-2:8401"
EOF
```

## VMAgent

[VMAgent](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/master/app/vmagent) -  is a tiny but brave agent, which helps you collect metrics from various sources and stores them in [VictoriaMetrics](https://github.com/VictoriaMetrics/VictoriaMetrics).
It requires access to Kubernetes API and you can create RBAC for it first, it can be found at `release/examples/VMAgent_rbac.yaml`
Or you can use default rbac account, that will be created for `VMAgent` by operator automatically.

```console
 kubectl apply -f release/examples/vmagent_rbac.yaml
```

Modify `VMAgent` config parameters at `release/examples/vmagent.yaml` and apply it, config options [doc](https://docs.victoriametrics.com/operator/api.html#vmagent)

Example:

```yaml
cat <<EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAgent
metadata:
  name: example-vmagent
spec:
  selectAllByDefault: true
  replicaCount: 1
  remoteWrite:
    - url: "http://vmsingle-example-vmsingle-persisted.default.svc:8429/api/v1/write"
EOF
```

 For connecting `VMAgent` to cluster, you have to specify url for it, check url building [doc](https://github.com/VictoriaMetrics/VictoriaMetrics/blob/cluster/README.md#url-format)

 Example:

 ```yaml
 cat <<EOF | kubectl apply -f -
 apiVersion: operator.victoriametrics.com/v1beta1
 kind: VMAgent
 metadata:
   name: example-vmagent
 spec:
   selectAllByDefault: true
   replicaCount: 1
   remoteWrite:
     - url: "http://vminsert-example-vmcluster.default.svc.cluster.local:8480/insert/0/prometheus/api/v1/write"
EOF

```


## VMAlertmanager

`VMAlertmanager` - represents alertmanager configuration, first, you have to create secret with a configuration for it.
If there is no secret, default secret will be created with predefined content. It is possible to provide raw yaml config
to the alertmanager.

`VMAlertmanager` has exactly the same logic for filtering `VMAlertmanagerConfig` with `spec.configSelector` and `spec.configNamespaceSelector`
as `VMAgent` does:
- `spec.configNamespaceSelector` - if its nil, only `VMAlertmanagerConfig`s in the `VMAlertmanager` namespace can be selected.
  If it's defined with empty value: `spec.configNamespaceSelector: {}` - all namespaces are matched.
  You may also add matchLabels or matchExpression syntax, but your namespace must be tagged with specified labels first:
```yaml
spec.configNamespaceSelector:
  matchLabels:
    name: default
```
- `spec.configSelector` - it selects `VMAlertmanagerConfig` objects by its labels.
  If it's nil, but `spec.configNamespaceSelector` isn't, the last one will be used for selecting.
  If it's defined with empty value: `spec.configSelector: {}`, all objects depending on NamespaceSelector.

```yaml
cat << EOF | kubectl apply -f -
apiVersion: v1
kind: Secret
metadata:
  name: alertmanager-config
stringData:
  alertmanager.yaml: |
    global:
      resolve_timeout: 5m
    route:
      group_by: ['job']
      group_wait: 30s
      group_interval: 5m
      repeat_interval: 12h
      receiver: 'webhook'
    receivers:
    - name: 'webhook'
      webhook_configs:
      - url: 'http://alertmanagerwh:30500/'
EOF
```

Then add `Alertmanager` object, other config options at [doc](https://docs.victoriametrics.com/operator/api.html#alertmanager)
you have to set configSecret with name of secret, that we created before - `alertmanager-config`.
```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAlertmanager
metadata:
  name: example-alertmanager
spec:
  # Add fields here
  replicaCount: 1
  configSecret: alertmanager-config
  selectAllByDefault: true
EOF
```

Alertmanager config  with raw yaml configuration, use it with care about secret information:
```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAlertmanager
metadata:
  name: example-alertmanager-raw-config
spec:
  # Add fields here
  replicaCount: 1
  configSecret: alertmanager-config
  configRawYaml: |
        global:
          resolve_timeout: 5m
        route:
          group_wait: 30s
          group_interval: 5m
          repeat_interval: 12h
          receiver: 'webhook'
        receivers:
        - name: 'webhook'
          webhook_configs:
          - url: 'http://localhost:30502/'
EOF
```

  
## VMAlertmanagerConfig

 `VMAlertmanagerConfig` allows managing `VMAlertmanager` configuration.

```yaml

cat << EOF | kubectl apply -f
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAlertmanagerConfig
metadata:
  name: example
  namespace: default
spec:
  inhibit_rules:
    - equals: []
      target_matchers: []
      source_matchers: []
  route:
    routes:
      - receiver: webhook
        continue: true
    receiver: email
    group_by: []
    continue: false
    matchers:
      - job = "alertmanager"
    group_wait: 30s
    group_interval: 45s
    repeat_interval: 1h
  mute_time_intervals:
    - name: base
      time_intervals:
        - times:
            - start_time: ""
              end_time: ""
          weekdays: []
          days_of_month: []
          months: []
          years: []
  receivers:
      email_configs: []
      webhook_configs:
        - url: http://some-other-wh
      pagerduty_configs: []
      pushover_configs: []
      slack_configs: []
      opsgenie_configs: []
      victorops_configs: []
      wechat_configs: []
EOF
```

## VMAlert

[VMAlert](https://github.com/VictoriaMetrics/VictoriaMetrics/tree/master/app/vmalert) - executes a list of given [alerting](https://prometheus.io/docs/prometheus/latest/configuration/alerting_rules/) or [recording](https://prometheus.io/docs/prometheus/latest/configuration/recording_rules/) rules against configured address. It
has few required config options - `datasource` and `notifier` are required, for other config parameters check [doc](https://docs.victoriametrics.com/operator/api.html#vmalert).

```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAlert
metadata:
  name: example-vmalert
spec:
  replicaCount: 1
  datasource:
    url: "http://vmsingle-example-vmsingle-persisted.default.svc:8429"
  notifier:
      url: "http://vmalertmanager-example-alertmanager.default.svc:9093"
  evaluationInterval: "30s"
  selectAllByDefault: true

EOF
```

## VMServiceScrape

 It generates part of `VMAgent` configuration with `Endpoint` kubernetes_sd role for service discovery targets
 by corresponding `Service` and it's `Endpoint`s.
 It has various options for scraping configuration of target (with basic auth,tls access, by specific port name etc).

Let's make some demo, you have to deploy [VMAgent](#vmagent) and [VMSingle](#vmsingle) from previous step with match any selectors:

```yaml
cat <<EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMSingle
metadata:
  name: example-vmsingle-persisted
spec:
  retentionPeriod: "1"
  removePvcAfterDelete: true
  storage:
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: 1Gi      
---
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAgent
metadata:
  name: example-vmagent
spec:
  selectAllByDefault: true
  replicaCount: 1
  remoteWrite:
    - url: "http://vmsingle-example-vmsingle-persisted.default.svc:8429/api/v1/write"
EOF
```



 Then deploy three instances of a simple example application, which listens and exposes metrics on port `8080`.

```yaml
cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  name: example-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: example-app
  template:
    metadata:
      labels:
        app: example-app
    spec:
      containers:
      - name: example-app
        image: fabxc/instrumented_app
        ports:
        - name: web
          containerPort: 8080
EOF
```

 Check status for pods:
 ```console
kubectl get pods 
NAME                                                   READY   STATUS    RESTARTS   AGE
example-app-594f97677c-g72v8                           1/1     Running   0          23s
example-app-594f97677c-kn66h                           1/1     Running   0          20s
example-app-594f97677c-l8xfd                           1/1     Running   0          17s
vm-operator-646df47888-jvfvj                           1/1     Running   0          63m
vmagent-example-vmagent-5777fdf7bf-tctcv               2/2     Running   1          34m
vmalertmanager-example-alertmanager-0                  2/2     Running   0          11m
vmsingle-example-vmsingle-persisted-794b59ccc6-fnkpt   1/1     Running   0          36m

```

Checking logs for `VMAgent`:
```console
kubectl logs vmagent-example-vmagent-5777fdf7bf-tctcv vmagent 
2020-08-02T18:18:17.226Z        info    VictoriaMetrics/app/vmagent/remotewrite/remotewrite.go:98       Successfully reloaded relabel configs
2020-08-02T18:18:17.229Z        info    VictoriaMetrics/lib/promscrape/scraper.go:137   found changes in "/etc/vmagent/config_out/vmagent.env.yaml"; applying these changes
2020-08-02T18:18:17.289Z        info    VictoriaMetrics/lib/promscrape/scraper.go:303   kubernetes_sd_configs: added targets: 2, removed targets: 0; total targets: 2
```
 By default, operator creates `VMServiceScrape` for its components, so we have 2 targets - `VMAgent` and `VMSingle`.
 
Let's add monitoring to our application:

First we add the `Service` for application:
```yaml
cat <<EOF | kubectl apply -f -
kind: Service
apiVersion: v1
metadata:
  name: example-app
  labels:
      app: example-app
spec:
  selector:
    app: example-app
  ports:
  - name: web
    port: 8080
EOF
```  

`VMServiceScrape` has a label selector to select `Services` and their underlying Endpoint objects.
`Service` object for the example application selects the Pods by the `app` label having the `example-app` value. 
`Service` object also specifies the port on which the metrics exposed.

The final part, add `VMServiceScrape`:

```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMServiceScrape
metadata:
  name: example-app
  labels:
    team: frontend
spec:
  selector:
    matchLabels:
      app: example-app
  endpoints:
  - port: web
EOF
```
 The `VMServiceScrape` has no  labels, but it will be selected by `VMAgent`, because we are launched `VMAgent` with empty selector.

 Let's check `VMAgent` logs (you have to wait some time for config sync, usually its around 1 min):
 
 ```console
kubectl logs vmagent-example-vmagent-5777fdf7bf-tctcv vmagent --tail 100
2020-08-03T08:24:13.312Z	info	VictoriaMetrics/lib/promscrape/scraper.go:106	SIGHUP received; reloading Prometheus configs from "/etc/vmagent/config_out/vmagent.env.yaml"
2020-08-03T08:24:13.312Z	info	VictoriaMetrics/app/vmagent/remotewrite/remotewrite.go:98	Successfully reloaded relabel configs
2020-08-03T08:24:13.315Z	info	VictoriaMetrics/lib/promscrape/scraper.go:137	found changes in "/etc/vmagent/config_out/vmagent.env.yaml"; applying these changes
2020-08-03T08:24:13.418Z	info	VictoriaMetrics/lib/promscrape/scraper.go:303	kubernetes_sd_configs: added targets: 3, removed targets: 0; total targets: 5

```

3 new targets added by a config reload.

## VMPodScrape

 It generates config part of `VMAgent` with  kubernetes_sd role  `pod`, that would match all `pods` having specific labels and ports. 
 It has various options for scraping configuration of target (with basic auth,tls access, by specific port name etc).
 
  Add `VMAgent` and Example app from step above and continue  this step.
  
  Let's add 2 new pods:
  ```yaml
cat << EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: example-pod
    owner: dev
    env: test
  name: example-app-pod-0
spec:
  containers:
  - image: fabxc/instrumented_app
    imagePullPolicy: IfNotPresent
    name: example-app
    ports:
    - containerPort: 8080
      name: web
      protocol: TCP
    resources: {}
---
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: example-pod-scrape
    owner: dev
    env: dev
  name: example-app-pod-1
spec:
  containers:
  - image: fabxc/instrumented_app
    imagePullPolicy: IfNotPresent
    name: example-app
    ports:
    - containerPort: 8080
      name: web
      protocol: TCP
    resources: {}
EOF
```

 Ensure, that pods started:
 ```console
kubectl get pods
NAME                                                   READY   STATUS    RESTARTS   AGE
example-app-594f97677c-g72v8                           1/1     Running   0          3m40s
example-app-594f97677c-kn66h                           1/1     Running   0          3m37s
example-app-594f97677c-l8xfd                           1/1     Running   0          3m34s
example-app-pod-0                                      1/1     Running   0          14s
example-app-pod-1                                      1/1     Running   0          14s
vm-operator-646df47888-jvfvj                           1/1     Running   0          67m
vmagent-example-vmagent-5777fdf7bf-tctcv               2/2     Running   1          37m
vmalertmanager-example-alertmanager-0                  2/2     Running   0          14m
vmsingle-example-vmsingle-persisted-794b59ccc6-fnkpt   1/1     Running   0          40m
```

 These pods have the same label `owner: dev` and port named `web`, so we can select them by `VMPodScrape` with matchLabels expression:
```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMPodScrape
metadata:
  name: example-pod-scrape
spec:
  podMetricsEndpoints:
    - port: web
      scheme: http
  selector:
    matchLabels:
     owner: dev
EOF
```  

 Lets check `VMAgent` logs:
 ```console
kubectl logs vmagent-example-vmagent-5777fdf7bf-tctcv vmagent --tail 100
2020-08-03T08:51:13.582Z	info	VictoriaMetrics/app/vmagent/remotewrite/remotewrite.go:98	Successfully reloaded relabel configs
2020-08-03T08:51:13.585Z	info	VictoriaMetrics/lib/promscrape/scraper.go:137	found changes in "/etc/vmagent/config_out/vmagent.env.yaml"; applying these changes
2020-08-03T08:51:13.652Z	info	VictoriaMetrics/lib/promscrape/scraper.go:303	kubernetes_sd_configs: added targets: 2, removed targets: 0; total targets: 7
```
 
2 new target was added.

## VMRule

It generates `VMAlert` config with ruleset defined at `VMRule` spec.

Lets create `VMAlert` with selector for `VMRule` with label project=devops.
  You also need datasource from previous step [VMSingle](#vmsingle) and [VMAgent](#vmagent) connected to it.

```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAlert
metadata:
  name: example-vmalert
spec:
  replicaCount: 1
  datasource:
    url: "http://vmsingle-example-vmsingle-persisted.default.svc:8429"
  notifier:
      url: "http://vmalertmanager-example-alertmanager.default.svc:9093"
  evaluationInterval: "30s"
  ruleSelector:
    matchLabels:
      project: devops
EOF
```

Ensure, that it started and ready:
```console
kubectl get pods -l app.kubernetes.io/name=vmalert
NAME                                       READY   STATUS    RESTARTS   AGE
vmalert-example-vmalert-6f8748c6f9-hcfrr   2/2     Running   0          2m26s

kubectl logs vmalert-example-vmalert-6f8748c6f9-hcfrr vmalert
2020-08-03T08:52:21.990Z        info    VictoriaMetrics/app/vmalert/manager.go:83       reading rules configuration file from "/etc/vmalert/config/vm-example-vmalert-rulefiles-0/*.yaml"
2020-08-03T08:52:21.992Z        info    VictoriaMetrics/app/vmalert/group.go:153        group "vmAlertGroup" started with interval 30s
2020-08-03T08:52:21.992Z        info    VictoriaMetrics/lib/httpserver/httpserver.go:76 starting http server at http://:8080/
2020-08-03T08:52:21.993Z        info    VictoriaMetrics/lib/httpserver/httpserver.go:77 pprof handlers are exposed at http://:8080/debug/pprof/

```
`VMAlert` shipped with default rule `vmAlertGroup`

Let's add simple rule for `VMAlert` itself, `delta(vmalert_config_last_reload_errors_total[5m]) > 1`

{% raw %}
```yaml
cat << 'EOF' | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMRule
metadata:
  name: example-vmrule-reload-config
  labels:
      project: devops
spec:
  groups:
    - name: vmalert
      rules:
        - alert: vmalert config reload error
          expr: delta(vmalert_config_last_reload_errors_total[5m]) > 0
          for: 10s
          labels:
            severity: major
            job:  "{{ $labels.job }}"
          annotations:
            value: "{{ $value }}"
            description: 'error reloading vmalert config, reload count for 5 min {{ $value }}'
EOF
```
{% endraw %}

 Ensure, that new alert was started:
 ```console
kubectl logs vmalert-example-vmalert-6f8748c6f9-hcfrr vmalert 
2020-08-03T09:07:49.772Z	info	VictoriaMetrics/app/vmalert/web.go:45	api config reload was called, sending sighup
2020-08-03T09:07:49.772Z	info	VictoriaMetrics/app/vmalert/main.go:115	SIGHUP received. Going to reload rules ["/etc/vmalert/config/vm-example-vmalert-rulefiles-0/*.yaml"] ...
2020-08-03T09:07:49.772Z	info	VictoriaMetrics/app/vmalert/manager.go:83	reading rules configuration file from "/etc/vmalert/config/vm-example-vmalert-rulefiles-0/*.yaml"
2020-08-03T09:07:49.773Z	info	VictoriaMetrics/app/vmalert/group.go:169	group "vmAlertGroup": received stop signal
2020-08-03T09:07:49.773Z	info	VictoriaMetrics/app/vmalert/main.go:124	Rules reloaded successfully from ["/etc/vmalert/config/vm-example-vmalert-rulefiles-0/*.yaml"]
2020-08-03T09:07:49.773Z	info	VictoriaMetrics/app/vmalert/group.go:153	group "vmalert" started with interval 30s

```

 Let's trigger it by adding some incorrect rule
 
{% raw %}
```yaml
cat << 'EOF' | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMRule
metadata:
  name: example-vmrule-incorrect-rule
  labels:
      project: devops
spec:
  groups:
    - name: incorrect rule
      rules:
        - alert: vmalert bad config
          expr: bad expression
          for: 10s
          labels:
            severity: major
          annotations:
            value: "{{ $badValue | bad function }}"
EOF
```
{% endraw %}

`VMAlert` will report incorrect rule config and fire alert:
```console
2020-08-03T09:11:40.672Z	info	VictoriaMetrics/app/vmalert/main.go:115	SIGHUP received. Going to reload rules ["/etc/vmalert/config/vm-example-vmalert-rulefiles-0/*.yaml"] ...
2020-08-03T09:11:40.672Z	info	VictoriaMetrics/app/vmalert/manager.go:83	reading rules configuration file from "/etc/vmalert/config/vm-example-vmalert-rulefiles-0/*.yaml"
2020-08-03T09:11:40.673Z	error	VictoriaMetrics/app/vmalert/main.go:119	error while reloading rules: cannot parse configuration file: invalid group "incorrect rule" in file "/etc/vmalert/config/vm-example-vmalert-rulefiles-0/default-example-vmrule-incorrect-rule.yaml": invalid rule "incorrect rule"."vmalert bad config": invalid expression: unparsed data left: "expression"
```

Clean up incorrect rule:
```console
kubectl delete vmrule example-vmrule-incorrect-rule
```

## VMNodeScrape

 `VMNodeScrape` is useful for node exporters monitoring, lets create scraper for cadvisor metrics:

```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMNodeScrape
metadata:
  name: cadvisor-metrics
spec:
  scheme: "https"
  tlsConfig:
    insecureSkipVerify: true
    caFile: "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
  bearerTokenFile: "/var/run/secrets/kubernetes.io/serviceaccount/token"
  relabelConfigs:
    - action: labelmap
      regex: __meta_kubernetes_node_label_(.+)
    - targetLabel: __address__
      replacement: kubernetes.default.svc:443
    - sourceLabels: [__meta_kubernetes_node_name]
      regex: (.+)
      targetLabel: __metrics_path__
      replacement: /api/v1/nodes/$1/proxy/metrics/cadvisor
EOF
```





## VMProbe

 `VMProbe` required `VMAgent` and some external prober, blackbox exporter in our case. Ensure that you have `VMAgent` and `VMSingle`:
 ```yaml
cat <<EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMSingle
metadata:
  name: example-vmsingle-persisted
spec:
  retentionPeriod: "1"
  removePvcAfterDelete: true
  storage:
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: 1Gi      
---
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAgent
metadata:
   name: example-vmagent
spec:
   selectAllByDefault: true
   replicaCount: 1
   remoteWrite:
     - url: "http://vmsingle-example-vmsingle-persisted.default.svc:8429/api/v1/write"
EOF
 ```

 Then add `BlackBox` exporter with simple config:
 
```yaml
cat << EOF | kubectl apply -f -
apiVersion: v1
kind: ConfigMap
metadata:
  name: prometheus-blackbox-exporter
  labels:
    app: prometheus-blackbox-exporter
data:
  blackbox.yaml: |
    modules:
      http_2xx:
        http:
          preferred_ip_protocol: ip4
          valid_http_versions:
          - HTTP/1.1
          - HTTP/2.0
          valid_status_codes: []
        prober: http
        timeout: 5s
---
kind: Service
apiVersion: v1
metadata:
  name: prometheus-blackbox-exporter
  labels:
    app: prometheus-blackbox-exporter
spec:
  type: ClusterIP
  ports:
    - name: http
      port: 9115
      protocol: TCP
  selector:
    app: prometheus-blackbox-exporter

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: prometheus-blackbox-exporter
  labels:
    app: prometheus-blackbox-exporter
spec:
  replicas: 1
  selector:
    matchLabels:
      app: prometheus-blackbox-exporter
  template:
    metadata:
      labels:
        app: prometheus-blackbox-exporter
    spec:
      containers:
        - name: blackbox-exporter
          image: "prom/blackbox-exporter:v0.17.0"
          args:
            - "--config.file=/config/blackbox.yaml"
          resources:
            {}
          ports:
            - containerPort: 9115
              name: http
          livenessProbe:
            httpGet:
              path: /health
              port: http
          readinessProbe:
            httpGet:
              path: /health
              port: http
          volumeMounts:
            - mountPath: /config
              name: config
      volumes:
        - name: config
          configMap:
            name: prometheus-blackbox-exporter
EOF
```

Ensure, that pods are ready:

```console
kubectl get pods
NAME                                                   READY   STATUS    RESTARTS   AGE
prometheus-blackbox-exporter-5b5f44bd9c-2szdj          1/1     Running   0          3m3s
vmagent-example-vmagent-84886cd4d9-x8ml6               2/2     Running   1          9m22s
vmsingle-example-vmsingle-persisted-8584486b68-mqg6b   1/1     Running   0          11m
```

Now define some `VMProbe`, lets start with basic static target and probe `VMAgent` with its service address, for accessing
blackbox exporter, you have to specify its url at `VMProbe` config. Lets get both services names:
```console
kubectl get svc
NAME                                  TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
kubernetes                            ClusterIP   10.96.0.1       <none>        443/TCP    4h21m
prometheus-blackbox-exporter          ClusterIP   10.105.251.80   <none>        9115/TCP   4m36s
vmagent-example-vmagent               ClusterIP   10.102.31.47    <none>        8429/TCP   12m
vmsingle-example-vmsingle-persisted   ClusterIP   10.107.69.7     <none>        8429/TCP   12m
```

So, we will probe `VMAgent` with url - `vmagent-example-vmagent.default.svc:9115/heath` with blackbox url: 
`prometheus-blackbox-exporter.default.svc:9115` and module: `http_2xx` it was specified at blackbox configmap.

```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMProbe
metadata:
  name: probe-agent
spec:
  jobName: static-probe
  vmProberSpec:
     # by default scheme http, and path is /probe
     url: prometheus-blackbox-exporter.default.svc:9115
  module: http_2xx
  targets:
   staticConfig: 
      targets:
      -  vmagent-example-vmagent.default.svc:8429/health
  interval: 2s 
EOF
```

Now new target must be added to `VMAgent` configuration, and it starts probing itself throw blackbox exporter.

Let's try another target probe type - `Ingress`. Create ingress rule for `VMSingle` and create `VMProbe` for it:

```yaml

cat << EOF | kubectl apply -f -
apiVersion: networking.k8s.io/v1beta1                                                                                                                                                                                                                                                                                             
kind: Ingress                                                                                                                                                                                                                                                                                                                
metadata:                                                                                                                                                                                                                                                                                                                    
  labels:
    app: victoria-metrics-single
  name: victoria-metrics-single
spec:
  rules:
  - host: vmsingle.example.com
    http:
      paths:
      - backend:
          serviceName: vmsingle-example-vmsingle-persisted
          servicePort: 8428
        path: /
  - host: vmsingle2.example.com
    http:
      paths:
      - backend:
          serviceName: vmsingle-example-vmsingle-persisted
          servicePort: 8428
        path: /

---
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMProbe
metadata:
  name: probe-single-ingress
spec:
  vmProberSpec:
     # by default scheme http, and path is /probe
     url: prometheus-blackbox-exporter.default.svc:9115
  module: http_2xx
  targets:
   ingress: 
      selector:
       matchLabels:
        app: victoria-metrics-single
  interval: 10s 
EOF
```

This configuration will add 2 additional targets for probing: `vmsingle2.example.com` and `vmsingle.example.com`.

But probes will be unsuccessful, coz there is no such hosts.

## VMStaticScrape

It generates config part of `VMAgent` with  static_configs, targets for targetEndpoint is a required parameter.
It has various options for scraping configuration of target (with basic auth,tls access, by specific port name etc).

Add `VMAgent` and Example app from step above and continue  this step.

With simple configuration:
```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMStaticScrape
metadata:
  name: vmstaticscrape-sample
spec:
  jobName: static
  targetEndpoints:
    - targets: ["192.168.0.1:9100","196.168.0.50:9100"]
      labels:
        env: dev
        project: operator
EOF
```
 2 targets must be added to `VMAgent` scrape config:
```console
static_configs: added targets: 2, removed targets: 0; total targets: 2
```


## VMAuth

[VMAuth](https://docs.victoriametrics.com/vmauth.html) allows protecting application with authentication and route traffic by rules.

api docs [link](https://docs.victoriametrics.com/operator/api.html#vmauthspec)

 First create `VMAuth` configuration:
```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAuth
metadata:
  name: example
  namespace: default
spec:
  ingress: {}
  selectAllByDefault: true
EOF
```
 It will catch all `VMUser` at any kubernetes namespace and create `Ingress` record for it.
```text
kubectl get pods
NAME                             READY   STATUS    RESTARTS   AGE
vmauth-example-ffcc78fcc-xddk7   2/2     Running   0          84s
kubectl get ingress
NAME             CLASS    HOSTS   ADDRESS   PORTS   AGE
vmauth-example   <none>   *                 80      106s
kubectl get secret -l app.kubernetes.io/name=vmauth
NAME                    TYPE     DATA   AGE
vmauth-config-example   Opaque   1      2m32s
```

 Generated configuration can be retrieved with command:
{% raw %}
```text
kubectl get secrets/vmauth-config-example -o=go-template='{{index .data "config.yaml.gz"}}' | base64 -d | gunzip

users:
- url_prefix: http://localhost:8428
  bearer_token: some-default-token
```
{% endraw %}

  Operator generates default config, if `VMUser`s for given `VMAuth` wasn't found.

## VMUser 

  `VMUser` configures `VMAuth`. api doc [link](https://docs.victoriametrics.com/operator/api.html#vmuserspec)

  There are two authentication mechanisms: `bearerToken` and `basicAuth` with `username` and `password`. Only one of them can be used with `VMUser` at one time.
If you need to provide access with different mechanisms for single endpoint, create multiple `VMUsers`.
 If `username` is empty, metadata.name from `VMUser` used as `username`.
 If `password` is empty, operator generates random password for `VMUser`. This password added to the `Secret` for this `VMUser` at `data.password` field.
 Operator creates `Secret` for every `VMUser` with name - `vmuser-{VMUser.metadata.name}`. It places `username` + `password` or `bearerToken` into `data` section.

`TargetRefs` is required field for `VMUser`, it allows to configure routing with:
- `static` ref:
```yaml
- static:
    url: http://vmalertmanager.service.svc:9093
  ```
- `crd` ref, allows to target CRD kind of operator, this `CRDObject` must exist.
```yaml
- crd:
   kind: VMAgent
   name: example
   namespace: default
```
  Supported kinds are: `VMAgent, VMSingle, VMAlert, VMAlertmanager, VMCluster/vminsert, VMCluster/vmselect, VMCluster/vmstorage`

`paths` - configures allowed routing paths for given `targetRef`.

 Let's create example, with access to `VMSingle` and `VMAlert` as static target: 

```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMSingle
metadata:
  name: example
  namespace: default
spec:
 retentionPeriod: "2d"
---
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAlert
metadata:
  name: example
spec:
  replicaCount: 1
  datasource:
    url: "http://vmsingle-example.default.svc:8429"
  notifier:
    url: "http://vmalertmanager-example.default.svc:9093"
  evaluationInterval: "20s"
  ruleSelector: {}
EOF
```

 Check its status
```console

kubectl get pods
NAME                                READY   STATUS    RESTARTS   AGE
vmalert-example-775b8dfbc9-vzlnv    1/2     Running   0          3s
vmauth-example-ffcc78fcc-xddk7      2/2     Running   0          29m
vmsingle-example-6496b5c95d-k6hhp   1/1     Running   0          3s
```

 Then create `VMUser`
```yaml
cat << EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMUser
metadata:
  name: example
spec:
  username: simple-user
  password: simple-password
  targetRefs:
    - crd:
        kind: VMSingle
        name: example
        namespace: default
      paths: ["/.*"]
    - static:
        url: http://vmalert-example.default.svc:8080
      paths: ["/api/v1/groups","/api/v1/alerts"]
EOF
```

 Configuration changes for `VMAuth` takes some time, coz of mounted secret, its eventually updated by kubelet. Check vmauth log for changes:

```console
kubectl logs vmauth-example-ffcc78fcc-xddk7 vmauth -f --tail 10
2021-05-31T10:46:40.171Z	info	VictoriaMetrics/app/vmauth/auth_config.go:168	Loaded information about 1 users from "/opt/vmauth/config.yaml"
2021-05-31T10:46:40.171Z	info	VictoriaMetrics/app/vmauth/main.go:37	started vmauth in 0.000 seconds
2021-05-31T10:46:40.171Z	info	VictoriaMetrics/lib/httpserver/httpserver.go:82	starting http server at http://:8427/
2021-05-31T10:46:40.171Z	info	VictoriaMetrics/lib/httpserver/httpserver.go:83	pprof handlers are exposed at http://:8427/debug/pprof/
2021-05-31T10:46:45.077Z	info	VictoriaMetrics/app/vmauth/auth_config.go:143	SIGHUP received; loading -auth.config="/opt/vmauth/config.yaml"
2021-05-31T10:46:45.077Z	info	VictoriaMetrics/app/vmauth/auth_config.go:168	Loaded information about 1 users from "/opt/vmauth/config.yaml"
2021-05-31T10:46:45.077Z	info	VictoriaMetrics/app/vmauth/auth_config.go:150	Successfully reloaded -auth.config="/opt/vmauth/config.yaml"
2021-05-31T11:18:21.313Z	info	VictoriaMetrics/app/vmauth/auth_config.go:143	SIGHUP received; loading -auth.config="/opt/vmauth/config.yaml"
2021-05-31T11:18:21.313Z	info	VictoriaMetrics/app/vmauth/auth_config.go:168	Loaded information about 1 users from "/opt/vmauth/config.yaml"
2021-05-31T11:18:21.313Z	info	VictoriaMetrics/app/vmauth/auth_config.go:150	Successfully reloaded -auth.config="/opt/vmauth/config.yaml"
```

 Now lets try to access protected  endpoints, i will use port-forward for that:

```console
kubectl port-forward vmauth-example-ffcc78fcc-xddk7 8427

# at separate terminal execute:

# vmsingle response
curl http://localhost:8427 -u 'simple-user:simple-password'

# vmalert response
curl localhost:8427/api/v1/groups -u 'simple-user:simple-password'
```

 Check create secret for application access:

```console
kubectl get secrets vmuser-example
NAME             TYPE     DATA   AGE
vmuser-example   Opaque   2      6m33s
```

## Migration from prometheus-operator objects

By default, the operator converts all existing prometheus-operator API objects into corresponding VictoriaMetrics Operator objects

You can control this behaviour by setting env variable for operator:

```console
#disable convertion for each object
VM_ENABLEDPROMETHEUSCONVERTER_PODMONITOR=false
VM_ENABLEDPROMETHEUSCONVERTER_SERVICESCRAPE=false
VM_ENABLEDPROMETHEUSCONVERTER_PROMETHEUSRULE=false
VM_ENABLEDPROMETHEUSCONVERTER_PROBE=false
```
Otherwise, VictoriaMetrics Operator would try to discover prometheus-operator API and convert it.


 Conversion of api objects can be controlled by annotations, added to `VMObject`s, there are following annotations:
 - `operator.victoriametrics.com/merge-meta-strategy` - it controls syncing of metadata labels and annotations between
    `VMObject`s and `Prometheus` api objects during updates to `Prometheus` objects. By default, it has `prefer-prometheus`.
     And annotations and labels will be used from `Prometheus` objects, manually set values will be dropped.
    You can set it to `prefer-victoriametrics`. In this case all labels and annotations applied to `Prometheus` object
     will be ignored and `VMObject` will use own values.
     Two additional strategies annotations -`merge-victoriametrics-priority` and `merge-prometheus-priority` merges labelSets into one combined labelSet, with priority.
    Example:
```yaml
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMServiceScrape
metadata:
  annotations:
    meta.helm.sh/release-name: prometheus
    operator.victoriametrics.com/merge-meta-strategy: prefer-victoriametrics
  labels:
    release: prometheus
  name: prometheus-monitor
spec:
  endpoints: []
```

- `operator.victoriametrics.com/ignore-prometheus-updates` - it controls updates from Prometheus api objects.
   By default, it set to `disabled`. You define it to `enabled` state and all updates from Prometheus api objects will be
   ignored.
```yaml
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMServiceScrape
metadata:
  annotations:
    meta.helm.sh/release-name: prometheus
    operator.victoriametrics.com/ignore-prometheus-updates: enabled
  labels:
    release: prometheus
  name: prometheus-monitor
spec:
  endpoints: []
```

By default the operator doesn't make converted objects disappear after original ones are deleted. To change this behaviour
configure adding `OwnerReferences` to converted objects:
```console
VM_ENABLEDPROMETHEUSCONVERTEROWNERREFERENCES=true
```
Converted objects will be linked to the original ones and will be deleted by kubernetes after the original ones are deleted.

### prometheus Rule duplication
 `Prometheus` allows to specify rules with the same content with-in one group at Rule spec, but its forbidden by vmalert.
 You can tell operator to deduplicate this rules by adding annotation to the `VMAlert` crd definition. In this case operator
 skips rule with the same values, see example below.
 ```yaml
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAlert
metadata:
  name: example-vmalert-with-dedup
  annotations:
    operator.victoriametrics.com/vmalert-deduplicate-rules: "true"
spec:
  replicaCount: 1
  datasource:
    url: "http://vmsingle-example-vmsingle-persisted.default.svc:8429"
  notifier:
      url: "http://vmalertmanager-example-alertmanager.default.svc:9093"
  evaluationInterval: "30s"
  ruleNamespaceSelector: {}
  ruleSelector: {}
```
 Now operator will transform this `VMRule`:
 ```yaml
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMRule
metadata:
  name: example-vmrule-reload-config
  labels:
      project: devops
spec:
  groups:
    - name: vmalert
      rules:
        - alert: vmalert config reload error
          expr: delta(vmalert_config_last_reload_errors_total[5m]) > 0
          for: 10s
          labels:
            severity: major
        - alert: vmalert config reload error
          expr: delta(vmalert_config_last_reload_errors_total[5m]) > 0
          for: 10s
          labels:
            severity: major
        - alert: vmalert config reload error
          expr: delta(vmalert_config_last_reload_errors_total[5m]) > 0
          for: 2m
          labels:
            severity: critical
```
to the rule config:

```yaml
  groups:
    - name: vmalert
      rules:
        - alert: vmalert config reload error
          expr: delta(vmalert_config_last_reload_errors_total[5m]) > 0
          for: 10s
          labels:
            severity: major
        - alert: vmalert config reload error
          expr: delta(vmalert_config_last_reload_errors_total[5m]) > 0
          for: 2m
          labels:
            severity: critical
```
## Expose the VMSingle API


> WARNING: Please protect delete endpoint before exposing it [doc](https://github.com/VictoriaMetrics/VictoriaMetrics#how-to-delete-time-series)

Example for Kubernetes Nginx ingress [doc](https://kubernetes.github.io/ingress-nginx/examples/auth/basic/)

```console
#generate creds
htpasswd -c auth foo

#create basic auth secret
cat <<EOF | kubectl apply -f -
apiVersion: v1
stringData:
  auth: foo:$apr1$wQ0fkxnl$KKOA/OqIZy48CuCB/A1Rc.
kind: Secret
metadata:
  name: vm-auth
type: Opaque
EOF

#create ingress rule
cat << EOF | kubectl apply -f -
apiVersion: networking.k8s.io/v1beta1                                                                                                                                                                                                                                                                                          
kind: Ingress                                                                                                                                                                                                                                                                                                                
metadata:                                                                                                                                                                                                                                                                                                                    
  annotations:                                                                                                                                                                                                                                                                                                               
    nginx.ingress.kubernetes.io/auth-realm: Authentication Required                                                                                                                                                                                                                                                          
    nginx.ingress.kubernetes.io/auth-secret: vm-auth                                                                                                                                                                                                                                                                         
    nginx.ingress.kubernetes.io/auth-type: basic
  labels:
    app: victoria-metrics-single
  name: victoria-metrics-single
spec:
  rules:
  - host: vmsingle.example.com
    http:
      paths:
      - backend:
          serviceName: vmsingle-example-vmsingle-persisted
          servicePort: 8428
        path: /
  tls:
  - hosts:
    - vmsingle.example.com
    secretName: ssl-name

EOF

#now you can access victoria metrics
curl -u foo:bar https://vmsingle.example/com/metrics
```

## Object selectors
`VMAgent` has four selectors specification for filtering `VMServiceScrape`, `VMProbe`, `VMNodeScrape` and `VMPodScrape` objects.
`VMAlert` has selectors for `VMRule`.
`VMAuth` has selectors for `VMUsers`.
`VMAlertmanager` has selectors for `VMAlertmanagerConfig`.

Selectors are defined with suffixes - `NamespaceSelector` and `Selector`. It allows configuring objects access control across namespaces and different environments.
Following rules are applied:
- `NamespaceSelector` and `Selector` - undefined, by default select nothing. With option set - `spec.selectAllByDefault: true`, select all objects of given type.
- `NamespaceSelector` defined, `Selector` undefined. All objects are matching at namespaces for given `NamespaceSelector`.
- `NamespaceSelector` undefined, `Selector` defined. All objects at `VMAgent`'s namespaces are matching for given `Selector`.
- `NamespaceSelector` defined, `Selector` defined. Only objects at namespaces matched `NamespaceSelector` for given `Selector` are matching.

### Object selector Examples
This configuration will match only namespace with  the label - name=default and all `VMServiceScrape` objects at this namespace will be
selected:
```yaml
cat <<EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAgent
metadata:
  name: example-vmagent
spec:
  serviceScrapeSelector: {}
  serviceScrapeNamespaceSelector: 
      matchLabels:
         name: default
  replicaCount: 1
  remoteWrite:
    - url: "http://vmsingle-example-vmsingle-persisted.default.svc:8429/api/v1/write"
EOF
```

This configuration will select `VMServiceScrape` and `VMPodScrape` with labels - team=managers,project=cloud at any namespace:
```yaml
cat <<EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAgent
metadata:
  name: example-vmagent
spec:
  serviceScrapeNamespaceSelector: {}
  serviceScrapeSelector:
   matchLabels:
       team: managers
       project: cloud
  podScrapeSelector:
   matchLabels:
       team: managers
       project: clo
  replicaCount: 1
  remoteWrite:
    - url: "http://vmsingle-example-vmsingle-persisted.default.svc:8429/api/v1/write"
EOF
```

The last one will select any `VMServiceScrape`,`VMProbe` and `VMPodScrape` at `VMAgent` namespace:
```yaml
cat <<EOF | kubectl apply -f -
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMAgent
metadata:
  name: example-vmagent
spec:
  serviceScrapeSelector: {}
  podScrapeSelector: {}
  probeSelector: {}
  replicaCount: 1
  remoteWrite:
    - url: "http://vmsingle-example-vmsingle-persisted.default.svc:8429/api/v1/write"
EOF 
```