Jenkins - Master and Slave Architecture

Master:

·         Schedule build jobs.

·         Dispatch builds to the slaves for the actual job execution.

·         Monitor the slaves and record the build results.

·         Master node itself can execute the build if slave node is not configured explicitly in the build job configuration

Slave:

·         Execute build jobs dispatched by the master.

We don’t need to install Jenkins in the slave nodes. We only need to configure slave node properly.

The only requirements are:

·         Configurations and Runtime Environment has to be available on the slave node.

·         Path needs to be configured correctly on Master node for Runtime. Environments or tools used by slave node for execution

Creating Slave machine

I am uing vagrant Ubuntu/trusty64 as slave machine

1.we need to upload the key 'id_rsa.pub' from the master to slave server nodes. We need to upload to each server nodes using command as below.

scp id_rsa vagrant@192.168.0.104:~/.ssh

scp id_rsa.pub vagrant@192.168.0.104:~/.ssh

2.Install Java on Slave

Install the 'software-properties-common' packages and add the java PPA repository

sudo add-apt-repository ppa:openjdk-r/ppa

sudo apt-get update

sudo apt-get install openjdk-8-jdk

java -version

3.Install Maven on Slave

apt-cache search maven

sudo apt-get install maven

mvn -version

4.Add Slave node

Dashboard > Manage Jenkins > Manage Nodes > New Node

·         Name: Slave-01-Ubuntu

·         Remote root directory: /home/vagrant

·         Launch method: Launch slave agent via SSH, type the host ip address 192.168.0.104

Vagrant-Ubuntu Credentials: Credentials > Add, then select added credentials

4.Configure Git, Java, Maven locations in Slave Node

To get Locations of Tools in Ubuntu system run below cmds

vagrant@vagrant-ubuntu-trusty-64:~$ which git

/usr/bin/git

vagrant@vagrant-ubuntu-trusty-64:~$ which java

/usr/bin/java

vagrant@vagrant-ubuntu-trusty-64:~$ which mvn

/usr/bin/mvn

Go To Manage Jenkins > Manage Nodes > Select: Slave Node > Configure > Tool Locations

5.Build the Job, it will run on  Slave node.

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