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83 lines
6.1 KiB
Markdown
Operator serves to make running VictoriaMetrics applications on top of Kubernetes as easy as possible while preserving Kubernetes-native configuration options.
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VictoriaMetrics Operator (`vmoperator`) is the classic kubernetes-operator for VictoriaMetrics with many [great features](#features-of-vmoperator).
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It allows you to manage Victoria Metrics components in Kubernetes or OpenShift clusters
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in a declarative style according to [GitOps](https://www.redhat.com/en/topics/devops/what-is-gitops)
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and [IaC](https://en.wikipedia.org/wiki/Infrastructure_as_code) concepts.
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VictoriaMetrics also provides [helm charts](https://github.com/VictoriaMetrics/helm-charts) without operator.
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Operator makes the same, simplifies it and provides [advanced features](#features-of-vmoperator).
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Learn more about [key concepts](#key-concepts) of `vmoperator` and follow the **[quick start guide](https://docs.victoriametrics.com/operator/quick-start/)** for a better experience.
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## Features of vmoperator
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- Deployment and management in a kubernetes clusters of any number of VictoriaMetrics applications (like vmsingle/vmcluster instances and another components like vmauth, vmagent, vmalert, etc...)
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- Seamless [migration from prometheus-operator](https://docs.victoriametrics.com/operator/migration/) with auto-conversion of prometheus [custom resources](#custom-resources)
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- Simple VictoriaMetrics cluster installation, configuring, upgrading and managing with [crd-objects](https://docs.victoriametrics.com/operator/resources/).
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- Ability to delegate the configuration (parts of configuration) of applications monitoring to the end-users and managing access to different configurations or configuration sections.
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- Integration with VictoriaMetrics [vmbackupmanager](https://docs.victoriametrics.com/vmbackupmanager/) - advanced tools for making backups. Check [Backup automation for VMSingle](https://docs.victoriametrics.com/operator/resources/vmsingle#backup-automation) or [Backup automation for VMCluster](https://docs.victoriametrics.com/operator/resources/vmcluster#backup-automation).
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- Everything you need for monitoring out of the box in [k8s-stack helm chart](https://victoriametrics.github.io/helm-charts/charts/victoria-metrics-k8s-stack/) with ready-made usecases and solutions.
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- Ability to template your own deployment scenarios.
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## Key Concepts
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### Kubernetes-operators
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[Kubernetes-operators](https://kubernetes.io/docs/concepts/extend-kubernetes/operator/) are software extensions
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for Kubernetes that make use of [custom resources](#custom-resources) to manage applications and their components.
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Operators follow Kubernetes principles, notably the control loop.
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It can be said that operators are custom controllers for Kubernetes that allow you to create business logic for custom resources.
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Design and implementation of `vmoperator` inspired by [prometheus-operator](https://github.com/prometheus-operator/prometheus-operator).
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Useful links:
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- [Custom resources](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/)
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- [Custom resource definitions](https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/)
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- [Operator pattern](https://kubernetes.io/docs/concepts/extend-kubernetes/operator/)
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- [Operator best practices](https://sdk.operatorframework.io/docs/best-practices/)
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### Custom resources
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Kubernetes-Operators use [custom resources](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/)
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for interaction. Custom resources are a mechanism built into Kubernetes that allows you to create your own extensions for Kubernetes,
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working on the same principles as those built into Kubernetes APIs. Custom resources make Kubernetes so modular and extensible.
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In addition, thanks to CRD ([Custom Resource Definitions](https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/)),
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the mechanism of custom resources allows you to declare an API in the format of the OpenAPI specification and verify that the resources correspond to this API.
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### Reconciliation cycle
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The main task of the operator is to bring the state of the cluster in line with what is declared by the user in the custom resources.
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This process of constant monitoring and adjustment is called the "Reconciliation cycle" - it is the operator's workflow.
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The basic workflow of working with the operator can be simplified as the following diagram:
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- Operator declares and owns [resources of Victoria Metrics](https://docs.victoriametrics.com/operator/resources/).
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- Kubernetes validates of the resource according to the specification from CRD (see more in [custom resources](#custom-resources)).
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- Operator subscribed to change events (`create`, `update`, `delete`) for related resources.
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- When an event occurs, the operator reacts and updates the state of the objects in the cluster.
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- For some objects in the cluster the reconciliation cycle is performed at a given interval, even without the occurrence of change events (see `VM_FORCERESYNCINTERVAL`).
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### Next steps
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- [Quick Start Guide](https://docs.victoriametrics.com/operator/quick-start/)
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- [Setup](https://docs.victoriametrics.com/operator/setup/)
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- [Security](https://docs.victoriametrics.com/operator/security/)
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- [Configuration](https://docs.victoriametrics.com/operator/configuration/)
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- [Migration from Prometheus](https://docs.victoriametrics.com/operator/migration/)
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- [Monitoring](https://docs.victoriametrics.com/operator/monitoring/)
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- [Authorization and exposing components](https://docs.victoriametrics.com/operator/auth/)
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- [High Availability](https://docs.victoriametrics.com/operator/high-availability/)
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- [Enterprise](https://docs.victoriametrics.com/operator/enterprise/)
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- [Custom resources](https://docs.victoriametrics.com/operator/resources/)
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If you have any questions, check out our [FAQ](https://docs.victoriametrics.com/operator/faq/)
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and feel free to can ask them:
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- [VictoriaMetrics Slack](https://victoriametrics.slack.com/)
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- [VictoriaMetrics Telegram](https://t.me/VictoriaMetrics_en)
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If you have any suggestions or find a bug, please create an issue
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on [GitHub](https://github.com/VictoriaMetrics/operator/issues/new).
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