Jenkins_Master_Slave_Architecture.txt

Master & Slave Architecture in Jenkins
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#When  we use only the master node (instance/server) to build the multiple projects then burden will be increased.

#If burden increases, then the master node will crash

#Therefore in real-time to execute multiple jobs paralelly we will use Master and Slave configuration.

#This way we can reduce burden on Master node.

#Master node only used to create jobs, configure, schedule and it will delegate build tasks to the slave nodes.

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Requirement to create a Slave Node:

1) Create a EC2 instance (Amazon linux/ubuntu)
2) If you have selected Ubuntu, Git software will be already installed.
3) We have to install Java
4) We also have to create a folder/directory on this Slave node.
Ex: /home/ubuntu: mkdir workloads
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Configure the Slave Node with Master Node
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1)Go to Jenkins Dashboard
2) Go to Manage Jenkins
3)Select 'Node'
4)Click on 'New Node'
5) Give a node name. Ex: Slave1
6)Copy the 'Remote root directory' : 
Ex: /home/ubuntu/workloads
7) Give proper label names:
Ex: JavaAppOnly
8)Launch Method:
Select: Launch agents via SSH
9)Host: select the slave node's public IP
10) Install plugin : 'SSH Agent'
11)Credentials:
Select: SSH user name with private key
12)user name: ubuntu
13)Select Private key and select 'Enter Directly' and click on 'Add'
14)Copy and paste the private key
15)Host Key Verification Strategy:
Select: Manually trusted key Verification Strategy