60 lines
3.8 KiB
Markdown
60 lines
3.8 KiB
Markdown
---
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title: Core Concept
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---
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KubeVela revolves around cloud-native application delivery and management scenarios. The application delivery model behind it is [Open Application Model](../platform-engineers/oam/oam-model), or OAM for short. It describes various components and operational traits required for application as a unified, and infrastructure-independent "deployment plan". As a result, we can achieve standardized and efficient application delivery in a multi-cloud/hybrid-cloud environment. KubeVela includes the following core concepts:
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## Application
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An application defines the delivery and management requirements of an artifact (binary, Docker image, Helm Chart...) or cloud service included in a microservice business unit. It consists of four parts: [Component](#component), [Trait](#trait), [Workflow](#workflow) and [Policy](#policy) and its lifecycle includes:
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- <b>Deploy</b> Execute Workflow. Instantiate application in one environment.
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- <b>Recycle</b> Delete the instance of the application and reclaim its resources.
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### Component
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Component defines the artifact of application，The best practice is to having one core component and subordinate components around it. Its type decided by [Component Definition](../platform-engineers/oam/x-definition#componentdefinition) .
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### Trait
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Triat are plugable operations that can attach to Component, for example: scaler for replicas(manual and auto), PVC, gateway, DNS and so on. You can draw out-of-box Trait from the ecosystem or simply customize by [Trait Definition](../platform-engineers/oam/x-definition#traitdefinition).
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### Workflow
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Workflow allows you to define critical step in the process of application delivery, typical steps will be manual approve, data passing, release across multi-cluster, notification and etc. Its type can be defined and customized by [Workflow Step Definition](../platform-engineers/oam/x-definition#workflowstepdefinition).
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### Policy
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Policy defines a strategy of certain aspect for application as to quality assurance, security, firewall rules, SLO and etc. Its type can be defined and customized by [Policy Definition](../platform-engineers/oam/x-definition#policydefinition).
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### Revision
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Revision generates each time when the application deployed and holds all infos in one snapshot. You use it for rolling back to whichever version whenever you needed.
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<!-- ## Project
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Project is where you manage all the applications and collaborate with your team member. Project is one stand alone scope that separates it from other project. -->
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## Environment
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Environment refers to the environment for development, testing, and production and it can include multiple Targets. Only applications in the same environment can visit and share resource with each other.
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- <b>Bind Application with Environment</b> The application can be bound to multiple Environments, and for each environment, you can set the unique parameter difference for each environment.
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## Target
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Target describes the space where the application resources actually delivered. One target describes one Kubernetes cluster and namespace, it can also describe a region or VPC for cloud providers. In the target, credentials of cloud resources created will automatically delievered to the Kubernetes cluster.
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## Cluster
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Import and manage your Kubernetes cluster in KubeVela。Kubernetes cluster is currently the main way for KubeVela application delivery.
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## Addon
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Addon is where you can freely pull in third-party capability that fulfills your need. This relies on the highly scalable design pattern of KubeVela. Each Addon will have its own [X-Definition](../platform-engineers/oam/x-definition).
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## Next Step
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- View [Tutorials](../tutorials/webservice) to look on more of what you can achieve with KubeVela.
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- View [How To guides](../how-to/dashboard/application/create-application) to check out more features.
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