VictoriaMetrics/docs/operator/migration.md
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---
weight: 5
title: Migration from Prometheus
menu:
docs:
parent: "operator"
weight: 5
aliases:
- /operator/migration/
- /operator/migration/index.html
---
Design and implementation inspired by [prometheus-operator](https://github.com/prometheus-operator/prometheus-operator).
It's great a tool for managing monitoring configuration of your applications. VictoriaMetrics operator has api capability with it.
So you can use familiar CRD objects: `ServiceMonitor`, `PodMonitor`, `PrometheusRule`, `Probe` and `AlertmanagerConfig`.
Or you can use VictoriaMetrics CRDs:
- `VMServiceScrape` (instead of `ServiceMonitor`) - defines scraping metrics configuration from pods backed by services. [See details](https://docs.victoriametrics.com/operator/resources/vmservicescrape/).
- `VMPodScrape` (instead of `PodMonitor`) - defines scraping metrics configuration from pods. [See details](https://docs.victoriametrics.com/operator/resources/vmpodscrape/).
- `VMRule` (instead of `PrometheusRule`) - defines alerting or recording rules. [See details](https://docs.victoriametrics.com/operator/resources/vmrule/).
- `VMProbe` (instead of `Probe`) - defines a probing configuration for targets with blackbox exporter. [See details](https://docs.victoriametrics.com/operator/resources/vmprobe/).
- `VMAlertmanagerConfig` (instead of `AlertmanagerConfig`) - defines a configuration for AlertManager. [See details](https://docs.victoriametrics.com/operator/resources/vmalertmanagerconfig/).
- `VMScrapeConfig` (instead of `ScrapeConfig`) - define a scrape config using any of the service discovery options supported in victoriametrics.
Note that Prometheus CRDs are not supplied with the VictoriaMetrics operator,
so you need to [install them separately](https://github.com/prometheus-operator/prometheus-operator/releases).
VictoriaMetrics operator supports conversion from Prometheus CRD of
version `monitoring.coreos.com/v1` for kinds `ServiceMonitor`, `PodMonitor`, `PrometheusRule`, `Probe`
and version `monitoring.coreos.com/v1alpha1` for kind `AlertmanagerConfig`.
The default behavior of the operator is as follows:
- It **converts** all existing Prometheus `ServiceMonitor`, `PodMonitor`, `PrometheusRule`, `Probe` and `ScrapeConfig` objects into corresponding VictoriaMetrics Operator objects.
- It **syncs** updates (including labels) from Prometheus `ServiceMonitor`, `PodMonitor`, `PrometheusRule`, `Probe` and `ScrapeConfig` objects to corresponding VictoriaMetrics Operator objects.
- It **DOES NOT delete** converted objects after original ones are deleted.
With this configuration removing prometheus-operator API objects wouldn't delete any converted objects. So you can safely migrate or run two operators at the same time.
You can change default behavior with operator configuration - [see details below](#objects-conversion).
## Objects conversion
By default, the vmoperator converts all existing [prometheus-operator](https://github.com/prometheus-operator/prometheus-operator)
API objects into corresponding VictoriaMetrics Operator objects ([see above](#migration-from-prometheus-operator)),
i.e. creates resources of VictoriaMetrics similar to Prometheus resources in the same namespace.
You can control this behaviour by setting env variable for operator:
```sh
# disable convertion for each object
VM_ENABLEDPROMETHEUSCONVERTER_PODMONITOR=false
VM_ENABLEDPROMETHEUSCONVERTER_SERVICESCRAPE=false
VM_ENABLEDPROMETHEUSCONVERTER_PROMETHEUSRULE=false
VM_ENABLEDPROMETHEUSCONVERTER_PROBE=false
VM_ENABLEDPROMETHEUSCONVERTER_SCRAPECONFIG=false
```
For [victoria-metrics-operator helm-chart](https://docs.victoriametrics.com/helm/victoriametrics-operator) you can use following way:
```yaml
# values.yaml
# ...
operator:
# -- By default, operator converts prometheus-operator objects.
disable_prometheus_converter: true
# ...
```
Otherwise, VictoriaMetrics Operator would try to discover prometheus-operator API and convert it.
![migration from prometheus](./migration_prometheus-conversion.webp)
For more information about the operator's workflow, see [this doc](https://docs.victoriametrics.com/operator).
## Deletion synchronization
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 with following [operator parameter](https://docs.victoriametrics.com/operator/setup#settings):
```sh
VM_ENABLEDPROMETHEUSCONVERTEROWNERREFERENCES=true
```
For [victoria-metrics-operator helm-chart](https://docs.victoriametrics.com/helm/victoriametrics-operator) you can use following way:
```yaml
# values.yaml
# ...
operator:
# -- Enables ownership reference for converted prometheus-operator objects,
# it will remove corresponding victoria-metrics objects in case of deletion prometheus one.
enable_converter_ownership: true
# ...
```
Converted objects will be linked to the original ones and will be deleted by kubernetes after the original ones are deleted.
## Update synchronization
Conversion of api objects can be controlled by annotations, added to `VMObject`s.
Annotation `operator.victoriametrics.com/ignore-prometheus-updates` 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.
Example:
```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: []
```
Annotation `operator.victoriametrics.com/ignore-prometheus-updates` can be set on one of the resources:
- [VMServiceScrape](https://docs.victoriametrics.com/operator/resources/vmservicescrape)
- [VMPodScrape](https://docs.victoriametrics.com/operator/resources/vmpodscrape)
- [VMRule](https://docs.victoriametrics.com/operator/resources/vmrule)
- [VMProbe](https://docs.victoriametrics.com/operator/resources/vmprobe)
- [VMAlertmanagerConfig](https://docs.victoriametrics.com/operator/resources/vmalertmanagerconfig)
- [VMScrapeConfig](https://docs.victoriametrics.com/operator/resources/vmscrapeconfig)
And annotation doesn't make sense for [VMStaticScrape](https://docs.victoriametrics.com/operator/resources/vmstaticscrape)
and [VMNodeScrape](https://docs.victoriametrics.com/operator/resources/vmnodescrape) because these objects are not created as a result of conversion.
## Labels and annotations synchronization
Conversion of api objects can be controlled by annotations, added to `VMObject`s.
Annotation `operator.victoriametrics.com/merge-meta-strategy` 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: []
```
Annotation `operator.victoriametrics.com/merge-meta-strategy` can be set on one of the resources:
- [VMServiceScrape](https://docs.victoriametrics.com/operator/resources/vmservicescrape)
- [VMPodScrape](https://docs.victoriametrics.com/operator/resources/vmpodscrape)
- [VMRule](https://docs.victoriametrics.com/operator/resources/vmrule)
- [VMProbe](https://docs.victoriametrics.com/operator/resources/vmprobe)
- [VMAlertmanagerConfig](https://docs.victoriametrics.com/operator/resources/vmalertmanagerconfig)
- [VMScrapeConfig](https://docs.victoriametrics.com/operator/resources/vmscrapeconfig)
And annotation doesn't make sense for [VMStaticScrape](https://docs.victoriametrics.com/operator/resources/vmstaticscrape)
and [VMNodeScrape](https://docs.victoriametrics.com/operator/resources/vmnodescrape) because these objects are not created as a result of conversion.
You can filter labels for syncing
with [operator parameter](https://docs.victoriametrics.com/operator/setup#settings) `VM_FILTERPROMETHEUSCONVERTERLABELPREFIXES`:
```sh
# it excludes all labels that start with "helm.sh" or "argoproj.io" from synchronization
VM_FILTERPROMETHEUSCONVERTERLABELPREFIXES=helm.sh,argoproj.io
```
In the same way, annotations with specified prefixes can be excluded from synchronization
with [operator parameter](https://docs.victoriametrics.com/operator/setup#settings) `VM_FILTERPROMETHEUSCONVERTERANNOTATIONPREFIXES`:
```sh
# it excludes all annotations that start with "helm.sh" or "argoproj.io" from synchronization
VM_FILTERPROMETHEUSCONVERTERANNOTATIONPREFIXES=helm.sh,argoproj.io
```
## Using converter with ArgoCD
If you use ArgoCD, you can allow ignoring objects at ArgoCD converted from Prometheus CRD
with [operator parameter](https://docs.victoriametrics.com/operator/setup#settings) `VM_PROMETHEUSCONVERTERADDARGOCDIGNOREANNOTATIONS`.
It helps to properly use converter with ArgoCD and should help prevent out-of-sync issues with argo-cd based deployments:
```sh
# adds compare-options and sync-options for prometheus objects converted by operator
VM_PROMETHEUSCONVERTERADDARGOCDIGNOREANNOTATIONS=true
```
## Data migration
You can use [vmctl](https://docs.victoriametrics.com/vmctl) for migrating your data from Prometheus to VictoriaMetrics.
See [this doc](https://docs.victoriametrics.com/vmctl#migrating-data-from-prometheus) for more details.
## Auto-discovery for prometheus.io annotations
There is a scenario where auto-discovery using `prometheus.io`-annotations
(such as `prometheus.io/port`, `prometheus.io/scrape`, `prometheus.io/path`, etc.)
is required when migrating from Prometheus instead of manually managing scrape objects.
You can enable this feature using special scrape object like that:
```yaml
apiVersion: operator.victoriametrics.com/v1beta1
kind: VMServiceScrape
metadata:
name: annotations-discovery
spec:
discoveryRole: service
endpoints:
- port: http
relabelConfigs:
# Skip scrape for init containers
- action: drop
source_labels: [__meta_kubernetes_pod_container_init]
regex: "true"
# Match container port with port from annotation
- action: keep_if_equal
source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_port, __meta_kubernetes_pod_container_port_number]
# Check if scrape is enabled
- source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
action: keep
regex: "true"
# Set scrape path
- source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
action: replace
target_label: __metrics_path__
regex: (.+)
# Set port to address
- source_labels:
[__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
action: replace
regex: ([^:]+)(?::\d+)?;(\d+)
replacement: $1:$2
target_label: __address__
# Copy labels from pod labels
- action: labelmap
regex: __meta_kubernetes_pod_label_(.+)
# Set pod name, container name, namespace and node name to labels
- source_labels: [__meta_kubernetes_pod_name]
target_label: pod
- source_labels: [__meta_kubernetes_pod_container_name]
target_label: container
- source_labels: [__meta_kubernetes_namespace]
target_label: namespace
- source_labels: [__meta_kubernetes_pod_node_name]
action: replace
target_label: node
namespaceSelector: {} # You need to specify namespaceSelector here
selector: {} # You need to specify selector here
```
You can find yaml-file with this example [here](https://github.com/VictoriaMetrics/operator/blob/master/config/examples/vmservicescrape_service_sd.yaml).
Check out more information about:
- [VMAgent](https://docs.victoriametrics.com/operator/resources/vmagent)
- [VMServiceScrape](https://docs.victoriametrics.com/operator/resources/vmservicescrape)
- [Relabeling](https://docs.victoriametrics.com/vmagent#relabeling)