2.7. 创建带有数据库的应用程序

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. 下载前端应用程序示例：

   $ git clone https://github.com/openshift/nodejs-ex

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2. 将当前目录改为前端目录：

   $ cd <directory-name>

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3. 列出目录的内容，以查看前端是一个 Node.js 应用程序。

   $ ls
   assets  bin  index.html  kwww-frontend.iml  package.json  package-lock.json  playfield.png  README.md  server.js

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   注意

   前端组件使用解释语言 (Node.js) 编写，不需要构建它。

4. 创建名为 frontend的 Node.js 组件类型组件配置：

   $ odo create nodejs frontend
    ✓  Validating component [5ms]
   Please use `odo push` command to create the component with source deployed

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5. 创建一个 URL 来访问前台接口。

   $ odo url create myurl
    ✓  URL myurl created for component: nodejs-nodejs-ex-pmdp

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6. 将组件推送到 OpenShift Container Platform 集群。

   $ odo push
   Validation
    ✓  Checking component [7ms]
   
    Configuration changes
    ✓  Initializing component
    ✓  Creating component [134ms]
   
    Applying URL changes
    ✓  URL myurl: http://myurl-app-myproject.192.168.42.79.nip.io created
   
    Pushing to component nodejs-nodejs-ex-mhbb of type local
    ✓  Checking files for pushing [657850ns]
    ✓  Waiting for component to start [6s]
    ✓  Syncing files to the component [408ms]
    ✓  Building component [7s]
    ✓  Changes successfully pushed to component

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1. 列出可用服务：

   $ odo catalog list services
   NAME                         PLANS
   django-psql-persistent       default
   jenkins-ephemeral            default
   jenkins-pipeline-example     default
   mariadb-persistent           default
   mongodb-persistent           default
   mysql-persistent             default
   nodejs-mongo-persistent      default
   postgresql-persistent        default
   rails-pgsql-persistent       default

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2. 选择 mongodb-persistent 服务类型，并查看所需参数：

   $ odo catalog describe service mongodb-persistent
     ***********************        | *****************************************************
     Name                           | default
     -----------------              | -----------------
     Display Name                   |
     -----------------              | -----------------
     Short Description              | Default plan
     -----------------              | -----------------
     Required Params without a      |
     default value                  |
     -----------------              | -----------------
     Required Params with a default | DATABASE_SERVICE_NAME
     value                          | (default: 'mongodb'),
                                    | MEMORY_LIMIT (default:
                                    | '512Mi'), MONGODB_VERSION
                                    | (default: '3.2'),
                                    | MONGODB_DATABASE (default:
                                    | 'sampledb'), VOLUME_CAPACITY
                                    | (default: '1Gi')
     -----------------              | -----------------
     Optional Params                | MONGODB_ADMIN_PASSWORD,
                                    | NAMESPACE, MONGODB_PASSWORD,
                                    | MONGODB_USER

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3. 指定所需参数，并等待数据库部署：

   $ odo service create mongodb-persistent --plan default --wait -p DATABASE_SERVICE_NAME=mongodb -p MEMORY_LIMIT=512Mi -p MONGODB_DATABASE=sampledb -p VOLUME_CAPACITY=1Gi

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1. 将数据库连接到前端服务中：

   $ odo link mongodb-persistent
    ✓  Service mongodb-persistent has been successfully linked from the component nodejs-nodejs-ex-mhbb
   
   Following environment variables were added to nodejs-nodejs-ex-mhbb component:
   - database_name
   - password
   - uri
   - username
   - admin_password

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2. 查看 Pod 中的应用程序和数据库的环境变量：

   $ oc get pods
   NAME                                READY     STATUS    RESTARTS   AGE
   mongodb-1-gsznc                     1/1       Running   0          28m
   nodejs-nodejs-ex-mhbb-app-4-vkn9l   1/1       Running   0          1m
   
   $ oc rsh nodejs-nodejs-ex-mhbb-app-4-vkn9l
   sh-4.2$ env
   uri=mongodb://172.30.126.3:27017
   password=dHIOpYneSkX3rTLn
   database_name=sampledb
   username=user43U
   admin_password=NCn41tqmx7RIqmfv
   sh-4.2$

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3. 在浏览器中打开 URL ，并在右下角记录数据库配置：

   $ odo url list

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   Request information
   Page view count: 24
   
   DB Connection Info:
   Type:	MongoDB
   URL:	mongodb://172.30.126.3:27017/sampledb

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流程

1. 列出当前项目中的应用程序：

   $ odo app list
       The project '<project_name>' has the following applications:
       NAME
       app

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2. 列出与应用程序关联的组件。这些组件将随应用程序一起删除：

   $ odo component list
       APP     NAME                      TYPE       SOURCE        STATE
       app     nodejs-nodejs-ex-elyf     nodejs     file://./     Pushed

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3. 删除应用程序：

   $ odo app delete <application_name>
       ? Are you sure you want to delete the application: <application_name> from project: <project_name>

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4. 使用 Y 确认删除。您可以使用 -f 标记来阻止确认提示。