How to-"Create a Auth service using Keycloak in Docker"

Follow these steps to create a Auth service using keycloak in Docker

1) Install Docker Desktop using   https://www.docker.com/products/docker-desktop/

2) Create a Docker Network (Optional)

     docker network create keycloak-network

3) Run Keycloak Container

    docker run -d --name keycloak ^  -p 8080:8080 ^  -e KEYCLOAK_USER=admin ^  -e KEYCLOAK_PASSWORD=admin ^  --network keycloak-network ^  jboss/keycloak

4) Check Container Status:  

    docker ps

    docker logs keycloak

5) Create a Docker Network (Optional)

  docker network create keycloak-network

6) Access Keycloak Admin Console

    Open a web browser and go to http://localhost:8080. Log in using the admin credentials (admin/admin).

7) Configure Keycloak Realm and Client

  Create a Realm:

  In the Keycloak Admin Console, click on "Add Realm" and set up a new realm with the desired settings.

  Create a Client:

  Within the created realm, go to "Clients" and click on "Create." Configure the client according to your    application needs.

8) Integrate Keycloak in Your Application

        npm install keycloak-connect express

   

   Create a file named `server.js`:

   

   

const express = require('express');

const session = require('express-session');

const Keycloak = require('keycloak-connect');

const app = express();

const PORT = 3000;

const memoryStore = new session.MemoryStore();

app.use(session({

secret: 'my-secret',

resave: false,

saveUninitialized: true,

store: memoryStore,

}));

const keycloak = new Keycloak({ store: memoryStore });

app.use(keycloak.middleware());

app.get('/', keycloak.protect(), (req, res) => {

res.send('Hello, secured world!');

});

app.listen(PORT, () => {

console.log(`Server is running on http://localhost:${PORT}`);

});

9) Run Your Application

   node server.js

    Access http://localhost:3000 in your browser

10) Install the express module, 

            npm init -y

            npm install express keycloak-connect express-session

11) Running your Node.js application again

           node server.js

12) Create a Keycloak Configuration File:

      Create a file named keycloak.json in your project directory. 

      This file contains the configuration details for your Keycloak setup. 

      Here's a minimal example; 

      replace the placeholder values with your actual Keycloak configuration:

      {

"realm": "your-realm-name",

"auth-server-url": "http://localhost:8080/auth",

"ssl-required": "external",

"resource": "your-client-id",

"credentials": {

"secret": "your-client-secret"

},

"confidential-port": 0

     }

Make sure the values for "realm", "auth-server-url", "resource", "credentials.secret", etc., match your Keycloak setup.