Merge pull request #1689 from soulseen/s2i-doc

update s2i docs

docs/en/concepts-and-designs/README.md

@@ -40,7 +40,7 @@ Read [DevOps Pipeline Overview](devops-pipeline-overview.md).
 
 ### KubeSphere S2I/B2I 
 
-TODO(@soulseen)
+Read [S2I/B2I Overview](s2i_b2i_overview.md)
 
 ### KubeSphere Monitoring 
 

docs/en/concepts-and-designs/s2i_b2i_overview.md

@@ -0,0 +1,34 @@
+# 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.
+
+## Workflow Example
+
+![](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.
+
+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.
+
+There are two mudules 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.
+
+Besides, the S2I stack includes 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
+
+Here is a graph that describes the relationship about all CRD within S2I architecture:
+
+​![](../../images/s2i_arch.png)
+
+Also you can install S2I component in any kubernetes cluster without KubeSphere.
+
+Want to see more about s2i, please jump to [S2I Operator](https://github.com/kubesphere/s2ioperator) and [S2IRun](https://github.com/kubesphere/s2irun)

docs/en/guides/README.md

@@ -65,7 +65,9 @@ The function of KubeSphere DevOps is mainly provided by KubeSphere apiserver.
 
 ### KubeSphere S2I/B2I developer
 
-TODO(@soulseen)
+1. If users who are interested in S2I/B2I, please read [S2I/B2I](https://github.com/kubesphere/s2ioperator#source-to-image-operator) to get start it.
+
+2. For developers who want to contribute, see [Development Guide for S2I/B2I](https://github.com/kubesphere/s2ioperator/blob/master/docs/DEVELOPMENT.md)
 
 ### KubeSphere Monitoring developer