updated with master and slave configuration document

jenkins/Jenkins_Master_Slave_configuration.md

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+# Jenkins master and Slave configuration
+
+## 🧰 Prerequisites
+1. Jenkins Server 
+2. Jenkins Agent server 
+
+## Procedure: 
+1. Goto Manage Nodes   
+   - Manage Jenkins --> Manage Nodes and Clouds --> New Node  
+
+2. Add the node name as Permanent Agent  
+
+3. Provide below information to add Jenkins agent  
+   **Name:** uniquely identifies an agent within this Jenkins installation  
+   **Description:** <Description>  
+   **Number of executors:** 2  
+   **Remote root directory:** /home/ec2-user/maven-agent   
+   **Labels:** Labels (or tags) are used to group multiple agents into one logical group.  
+   **Usage:**  
+   - Use this node as much as possible  
+   - Only build jobs with label expressions matching this node   
+
+   **Launch method:**   
+   	  - Launch agent by connecting it to the master   
+   	  - Launch agent via execution of command on the controller  
+
+   **Custom WorkDir path:**  custom Remoting work directory will be used instead of the Agent Root Directory  
+   **- Use WebSocket [x]**  
+   **Availability:**  
+   	- Keep this agent online as much as possible  
+   	- Bring this agent online according to a schedule  
+   	- Bring this agent online when in demand, and take offline when idle  
+
+4. Once you save above configuration you will get a command which should be executed in the agent. it contains agent.jar, a secret-file, and a jnlp file 
+   ```sh
+     echo "secret_key" > secret-file
+     java -jar agent.jar -jnlpUrl http://<Jenkins_URL>/computer/abc/jenkins-agent.jnlp -secret @secret-file -workDir "/home/ec2-user"
+   ```
+5. Once connected you can create or edit a job to chose this option in the `Restrict where this project can be run`
+
+
+## Lessons Learned:   
+  1. Master and slave should have  
+     - same Java version  
+     - Same Maven version   
+  1. In case Jave or Maven paths are referring to the agent system then aline it according to masters `Global Tool Configuration`  
+  1. In case the case of the AWS server make sure your Jenkins URL should be updated to the latest Public IP.   
+
+
+## Contributing
+Contributions are always welcome!
+
+## 🧹 CleanUp 
+  Is it a test environment? 
+  stop or terminate Jenkins system 
+  stop or terminate agent system 
+
+## 🔗 My Profile
+[![portfolio](https://img.shields.io/badge/my_portfolio-000?style=for-the-badge&logo=ko-fi&logoColor=white)](https://www.udemy.com/user/ar-shankar/)  
+[![linkedin](https://img.shields.io/badge/linkedin-0A66C2?style=for-the-badge&logo=linkedin&logoColor=white)](https://www.linkedin.com/in/ravdsun/)