website/content/en/docs/project-user-guide/application/compose-app.md

title	keywords	description	linkTitle	weight
Create a Microservices-based App	KubeSphere, Kubernetes, service mesh, microservices	Learn how to compose a microservice-based application from scratch.	Create a Microservices-based App	10140

With each microservice handling a single part of the app's functionality, an app can be divided into different components. These components have their own responsibilities and limitations, independent from each other. In KubeSphere, this kind of app is called Composing App, which can be built through newly created Services or existing Services.

This tutorial demonstrates how to create a microservices-based app Bookinfo, which is composed of four Services, and set a customized domain name to access the app.

Prerequisites

• You need to create a workspace, a project, and a user account (project-regular) for this tutorial. The account needs to be invited to the project with the operator role. For more information, see Create Workspaces, Projects, Accounts and Roles.
• project-admin needs to set the project gateway so that project-regular can define a domain name when creating the app.

Create Microservices that Compose an App

1. Log in to the web console of KubeSphere and navigate to Apps in Application Workloads of your project. On the Composing Apps tab, click Create Composing App.

2. Set a name for the app (for example, bookinfo) and click Next.

3. On the System Components page, you need to create microservices that compose the app. Click Add Service and select Stateless Service.

4. Set a name for the Service (e.g productpage) and click Next.

   {{< notice note >}}

   You can create a Service on the dashboard directly or enable Edit Mode in the top-right corner to edit the YAML file.

   {{</ notice >}}

5. Click Add Container Image under Container Image and enter kubesphere/examples-bookinfo-productpage-v1:1.13.0 in the search bar to use the Docker Hub image.

   {{< notice note >}}

   You must press Enter in your keyboard after you enter the image name.

   {{</ notice >}}

6. Click Use Default Ports. For more information about image settings, see Container Image Settings. Click √ in the bottom-right corner and Next to continue.

7. On the Mount Volumes page, add a volume or click Next to continue.

8. Click Add on the Advanced Settings page directly.

9. Similarly, add the other three microservices for the app. Here is the image information:

   Service	Name	Image
   Stateless	details	kubesphere/examples-bookinfo-details-v1:1.13.0
   Stateless	reviews	kubesphere/examples-bookinfo-reviews-v1:1.13.0
   Stateless	ratings	kubesphere/examples-bookinfo-ratings-v1:1.13.0

10. When you finish adding microservices, click Next.

11. On the Internet Access page, click Add Route Rule. On the Specify Domain tab, set a domain name for your app (for example, demo.bookinfo) and select http in the Protocol field. For Paths, select the Service productpage and port 9080. Click OK to continue.

    

    {{< notice note >}}

The button Add Route Rule is not visible if the project gateway is not set.

{{</ notice >}}

12. You can add more rules or click Create to finish the process.

13. Wait for your app to reach the Ready status.

Access the App

1. As you set a domain name for the app, you need to add an entry in the hosts (/etc/hosts) file. For example, add the IP address and hostname as below:

   192.168.0.9 demo.bookinfo
   

   {{< notice note >}}

   You must add your own IP address and hostname.

   {{</ notice >}}

2. In Composing Apps, click the app you just created.

3. In Application Components, click Click to visit to access the app.

   

   

   {{< notice note >}}

   Make sure you open the port in your security group.

   {{</ notice >}}

4. Click Normal user and Test user respectively to see other Services.