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Update devops sig s2i guide

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Ray Zhou 2020-03-19 09:21:55 +08:00
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# KubeSphere S2I/B2I overview
# KubeSphere S2I/B2I Overview
## What is S2I/B2I
Kubesphere S2I(Source-to-Image) / B2I(Binary-to-Image) provides easy CI/CD functionalities, help developers to publish their service to Kubernetes without writing Dockefile.
KubeSphere S2I (Source-to-Image) / B2I (Binary-to-Image) provides easy-to-use CI/CD functionalities, helping developers to publish their services to Kubernetes without writing Dockefile.
## Workflow Example
![](https://pek3b.qingstor.com/kubesphere-docs/png/20191223103533.png)
![Workflow](https://pek3b.qingstor.com/kubesphere-docs/png/20191223103533.png)
## Principle
All resources of S2I/B2I will be installed in namespace `kubesphere-devops-system` by enable devops component.
All resources of S2I/B2I will be installed in namespace `kubesphere-devops-system` when DevOps component enabled.
In S2I, all resources and CI/CD steps are defined with [Custom Resource Defintion](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/) (CRD). You can operate all s2i resources by call k8s api directly.
In S2I, all resources and CI/CD steps are defined with [Custom Resource Defintion](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/) (CRD). You can operate all S2I resources by calling K8s API directly.
There are two mudules included in the S2I component:
There are two modules included in the S2I component:
1. S2I Operator: A Kubernetes CRD controller that provides easy Kubernetes-style resources for declaring CI/CD-style pipelines
2. S2IRun: It is the instance that executes the s2i build process in containers.
1. S2I operator: A Kubernetes CRD controller that provides easy Kubernetes-style resources for declaring CI/CD-style pipelines.
2. S2IRun: It is the instance that executes the S2I build process in containers.
Besides, the S2I stack includes following CRD resources:
Besides, the S2I stack includes the following CRD resources:
1. s2ibuildertemplates: defines information about S2I builder image.
2. s2ibuilders: all configuration information used in building are stored in this CRD.
3. s2iruns: defines an action about build
2. s2ibuilders: all configuration information used in building is stored in this CRD.
3. s2iruns: defines an action about build.
Here is a graph that describes the relationship about all CRD within S2I architecture:
Here is a graph that describes the relationship about all CRDs within S2I architecture:
​![](../../images/s2i_arch.png)
​![S2I Arch](../../images/s2i_arch.png)
Also you can install S2I component in any kubernetes cluster without KubeSphere.
Also you can install S2I component in any Kubernetes cluster without installing KubeSphere.
Want to see more about s2i, please jump to [S2I Operator](https://github.com/kubesphere/s2ioperator) and [S2IRun](https://github.com/kubesphere/s2irun)
If you want to see more about S2I, please go to [S2I Operator](https://github.com/kubesphere/s2ioperator) and [S2IRun](https://github.com/kubesphere/s2irun).