This is a cache of https://docs.openshift.com/container-platform/4.3/cli_reference/openshift_developer_cli/creating-an-application-with-a-database.html. It is a snapshot of the page at 2024-11-26T02:27:22.609+0000.
Creating an application with a database - OpenShift Do developer CLI (odo) | CLI tools | OpenShift Container Platform 4.3
    OpenShift docs are moving and will soon only be available at docs.redhat.com, the home of all Red Hat product documentation. Explore the new docs experience today.
  1. Documentation
    2. history
×

Creating an application with a database

Prerequisites

  • odo is installed.

  • oc client is installed.

  • You have a running OpenShift Container Platform cluster. Developers can use CodeReady Containers (CRC) to deploy a local OpenShift Container Platform cluster quickly.

  • service Catalog is enabled.

Creating a project

Create a project to keep your source code, tests, and libraries organized in a separate single unit.

Procedure

  1. Log in to an OpenShift Container Platform cluster:

    $ odo login -u developer -p developer

  2. Create a project:

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

Deploying the front-end component

To create and deploy a front-end component, download the Node.js application and push the source code to your cluster with odo.

Procedure

  1. Download the example front-end application:

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

  2. Change the current directory to the front-end directory:

    $ cd <directory-name>

  3. List the contents of the directory to see that the front end is a Node.js application.

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

    The front-end component is written in an interpreted language (Node.js); it does not need to be built.

  4. Create a component configuration of Node.js component-type named frontend:

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

  5. Create a URL to access the frontend interface.

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

  6. Push the component to the OpenShift Container Platform cluster.

    $ 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

Deploying a database in interactive mode

odo provides a command-line interactive mode which simplifies deployment.

Procedure

  • Run the interactive mode and answer the prompts:

    $ odo service create
? Which kind of service do you wish to create database
? Which database service class should we use mongodb-persistent
? Enter a value for string property DATABASE_service_NAME (Database service Name): mongodb
? Enter a value for string property MEMORY_LIMIT (Memory Limit): 512Mi
? Enter a value for string property MONGODB_DATABASE (MongoDB Database Name): sampledb
? Enter a value for string property MONGODB_VERSION (Version of MongoDB Image): 3.2
? Enter a value for string property VOLUME_CAPACITY (Volume Capacity): 1Gi
? Provide values for non-required properties No
? How should we name your service  mongodb-persistent
? Output the non-interactive version of the selected options No
? Wait for the service to be ready No
 ✓  Creating service [32ms]
 ✓  service 'mongodb-persistent' was created
Progress of the provisioning will not be reported and might take a long time.
You can see the current status by executing 'odo service list'

Your password or username will be passed to the front-end application as environment variables.

Deploying a database manually

  1. List the available services:

    $ 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

  2. Choose the mongodb-persistent type of service and see the required parameters:

    $ 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

  3. Pass the required parameters as flags and wait for the deployment of the database:

    $ 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

Connecting the database to the front-end application

  1. Link the database to the front-end service:

    $ 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

  2. See the environment variables of the application and the database in the Pod:

    $ 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-4.3$ env
uri=mongodb://172.30.126.3:27017
password=dHIOpYneSkX3rTLn
database_name=sampledb
username=user43U
admin_password=NCn41tqmx7RIqmfv
sh-4.3$

  3. Open the URL in the browser and notice the database configuration in the bottom right:

    $ odo url list
    Request information
Page view count: 24

DB Connection Info:
Type:	MongoDB
URL:	mongodb://172.30.126.3:27017/sampledb

Deleting an application

Deleting an application will delete all components associated with the application.
Procedure

  1. List the applications in the current project:

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

  2. List the components associated with the applications. These components will be deleted with the application:

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

  3. Delete the application:

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

  4. Confirm the deletion with Y. You can suppress the confirmation prompt using the -f flag.