2.8. 使用 devfile 创建应用程序

流程

1. 登陆到一个OpenShift Container Platform集群。

   $ odo login -u developer -p developer

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2. 创建一个项目：

   $ odo project create myproject
    ✓  Project 'myproject' is ready for use
    ✓  New project created and now using project : myproject

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流程

1. 要列出集群中可用的 devfile 组件，请运行：

   $ odo catalog list components was

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   输出列出了可用的 odo 组件：

   Odo OpenShift Components:
    NAME              PROJECT       TAGS                        SUPPORTED
    java              openshift     11,8,latest                 YES
    nodejs            openshift     10-SCL,8,8-RHOAR,latest     YES
    dotnet            openshift     2.1,2.2,3.0,latest          NO
    golang            openshift     1.11.5,latest               NO
    httpd             openshift     2.4,latest                  NO
    modern-webapp     openshift     10.x,latest                 NO
    nginx             openshift     1.10,1.12,latest            NO
    perl              openshift     5.24,5.26,latest            NO
    php               openshift     7.0,7.1,7.2,latest          NO
    python            openshift     2.7,3.6,latest              NO
    ruby              openshift     2.4,2.5,latest              NO
   
    Odo Devfile Components:
    NAME                 DESCRIPTION                           SUPPORTED
    maven                Upstream Maven and OpenJDK 11         YES
    nodejs               Stack with NodeJS 10                  YES
    openLiberty          Open Liberty microservice in Java     YES
    java-spring-boot     Spring Boot® using Java               YES

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流程

1. 创建一个目录来存储组件的源代码：

    $ mkdir <directory-name>

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2. 创建名为 myspring 的 Spring Boot 组件类型的组件配置并下载其示例项目：

      $ odo create java-spring-boot myspring --downloadSource

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   上面的命令会产生以下输出：

      Experimental mode is enabled, use at your own risk
   
      Validation
       ✓  Checking devfile compatibility [195728ns]
       ✓  Creating a devfile component from registry: DefaultDevfileRegistry [170275ns]
       ✓  Validating devfile component [281940ns]
   
       Please use `odo push` command to create the component with source deployed

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   odo create 命令从记录的 devfile registry 中下载相关的 devfile.yaml 文件。

3. 列出目录的内容以确认下载了 devfile 和示例 Java 应用程序：

     $ ls

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   上面的命令会产生以下输出：

     README.md    devfile.yaml    pom.xml        src

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4. 创建一个 URL 以访问部署的组件：

    $ odo url create --host apps-crc.testing

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   上面的命令会产生以下输出：

     ✓  URL myspring-8080.apps-crc.testing created for component: myspring
   
    To apply the URL configuration changes, please use odo push

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   注意

   创建 URL 时必须使用集群主机名。

5. 将组件推送到集群：

     $ odo push

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   上面的命令会产生以下输出：

     Validation
      ✓  Validating the devfile [81808ns]
   
     Creating Kubernetes resources for component myspring
      ✓  Waiting for component to start [5s]
   
     Applying URL changes
      ✓  URL myspring-8080: http://myspring-8080.apps-crc.testing created
   
     Syncing to component myspring
      ✓  Checking files for pushing [2ms]
      ✓  Syncing files to the component [1s]
   
     Executing devfile commands for component myspring
      ✓  Executing devbuild command "/artifacts/bin/build-container-full.sh" [1m]
      ✓  Executing devrun command "/artifacts/bin/start-server.sh" [2s]
   
     Pushing devfile component myspring
      ✓  Changes successfully pushed to component

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6. 列出组件的 URL 以验证组件已被成功推送：

    $ odo url list

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   上面的命令会产生以下输出：

    Found the following URLs for component myspring
    NAME              URL                                       PORT     SECURE
    myspring-8080     http://myspring-8080.apps-crc.testing     8080     false

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7. 使用生成的 URL 查看部署的应用程序。

     $ curl http://myspring-8080.apps-crc.testing

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