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94 lines
4.4 KiB
Markdown
94 lines
4.4 KiB
Markdown
---
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title: Flagger
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meta:
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- name: "keywords"
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content: "gitops kubernetes flagger istio linkerd appmesh"
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- name: "twitter:card"
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content: "summary_large_image"
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- name: "twitter:title"
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content: "Flagger"
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- name: "twitter:description"
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content: "Progressive delivery Kubernetes operator (Canary, A/B Testing and Blue/Green deployments)"
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- name: "twitter:image:src"
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content: "https://flagger.app/flagger-overview.png"
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home: true
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heroText: Flagger
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tagline: Progressive Delivery Operator for Kubernetes
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actionText: Get Started →
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actionLink: https://docs.flagger.app
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features:
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- title: Safer Releases
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details: Reduce the risk of introducing a new software version in production by gradually shifting traffic to the new version while measuring metrics like HTTP/gRPC request success rate and latency.
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- title: Flexible Traffic Routing
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details: Shift and route traffic between app versions using a service mesh like Istio, Linkerd or AWS App Mesh. If you're not using a service mesh then an ingress controller like NGINX or Gloo can also be used.
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- title: Extensible Validation
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details: Besides the builtin metrics checks, the application analysis can be extended with custom Prometheus metrics and webhooks for running acceptance tests, load tests, or any other custom validation.
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footer: Apache License 2.0 | Copyright © 2019 Weaveworks
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---
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## Progressive Delivery
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Flagger was designed to give developers confidence in automating production releases with progressive delivery techniques.
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::: tip Canary release
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A benefit of using canary releases is the ability to do capacity testing of the new version in a production environment
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with a safe rollback strategy if issues are found. By slowly ramping up the load, you can monitor and capture metrics
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about how the new version impacts the production environment.
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[Martin Fowler](https://martinfowler.com/bliki/CanaryRelease.html)
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:::
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Flagger can run automated application analysis, testing, promotion and rollback for the following deployment strategies:
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* **Canary** (progressive traffic shifting)
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* [Istio](https://docs.flagger.app/usage/progressive-delivery),
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[Linkerd](https://docs.flagger.app/usage/linkerd-progressive-delivery),
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[App Mesh](https://docs.flagger.app/usage/appmesh-progressive-delivery),
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[NGINX](https://docs.flagger.app/usage/nginx-progressive-delivery),
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[Gloo](https://docs.flagger.app/usage/gloo-progressive-delivery)
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* **A/B Testing** (HTTP headers and cookies traffic routing)
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* [Istio](https://docs.flagger.app/usage/ab-testing),
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[NGINX](https://docs.flagger.app/usage/nginx-progressive-delivery#a-b-testing)
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* **Blue/Green** (traffic switching)
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* [Kubernetes CNI](https://docs.flagger.app/usage/blue-green)
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Flagger can be configures to send notifications to a
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[Slack](https://docs.flagger.app/usage/alerting#slack) or
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[Microsoft Teams](https://docs.flagger.app/usage/alerting#microsoft-teams) channel.
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It will post messages when a deployment has been initialised,
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when a new revision has been detected and if the canary analysis failed or succeeded.
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## GitOps
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You can build fully automated GitOps pipelines for canary deployments with Flagger and
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[FluxCD](https://github.com/fluxcd) (CNCF sandbox project).
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::: tip GitOps
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GitOps is a way to do Kubernetes cluster management and application delivery.
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It works by using Git as a single source of truth for declarative infrastructure and applications.
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With Git at the center of your delivery pipelines, developers can make pull requests
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to accelerate and simplify application deployments and operations tasks to Kubernetes.
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[Weaveworks](https://www.weave.works/technologies/gitops/)
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:::
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GitOps tutorials:
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* [Progressive Delivery for Istio with Flagger and Flux](https://github.com/stefanprodan/gitops-istio)
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* [Progressive Delivery for Linkerd with Flagger and Flux](https://helm.workshop.flagger.dev)
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## Getting Help
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If you have any questions about Flagger and progressive delivery:
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* Read the Flagger [docs](https://docs.flagger.app).
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* Invite yourself to the [Weave community slack](https://slack.weave.works/)
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and join the [#flagger](https://weave-community.slack.com/messages/flagger/) channel.
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* Join the [Weave User Group](https://www.meetup.com/pro/Weave/) and get invited to online talks,
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hands-on training and meetups in your area.
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* File an [issue](https://github.com/weaveworks/flagger/issues/new).
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Your feedback is always welcome!
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