Master slave Configuration, password-less connection between master and slave machine, Creating new node in Jenkins,

Master – Slave configuration 

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Same version of java should exist. 

Master and slave should have password less SSH 

Step 1: Create slave machine  , connect to slave 

1) Update the apt repository 

sudo apt-get update 

2)  sudo apt install openjdk-8-jdk -y 

3) Check the Java Version 

java -version 

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We need to establish password less connection between Dev server and Slave machine 

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Connect to slave 

7) Check you user 

$ whoami       (  ubuntu ) 

8) set password  for  ubuntu  user 

syntax: sudo  passwd  <user_name> 

Ex:        sudo passwd ubuntu 

enter password 

$  cd /etc/ssh 

$ ls   ( we get list of files )   Look for   sshd_config 

To edit sshd_config 

$ sudo vim sshd_config 

Go to insert mode 

) change password authentication to yes 

13) Save and quit :wq 

14) Restart the service 

$ sudo service ssh restart 

Lets test the connection 

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15) Connect to the development server  ( Master ) 

16) connect to slave server through dev server 

ssh ubuntu@private_ip_slave_machine 

$ ssh ubuntu@172.31.1.107 

exit  ( to come back to master ) 

+++++++++++++++++++++++++++++++++++++++ 

17)  To connect to slave  without password 

$ ssh-keygen      ( In master) 

18) copy the keys to slave server 

ssh-copy-id  ubuntu@private_ip_slave_server 

ssh-copy-id  ubuntu@172.31.1.107 

19) now we are able to connect to the slave user without password 

$  ssh ubuntu@172.31.1.107 

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Download slave.jar in slave machine 

 sudo  wget http://172.31.30.211:8080/jnlpJars/slave.jar 

Check the file is download or not 

$ ls 

check the file permissions 

$ ls -l 

we want    rwxrw-r– 

3) Give execute permissions of this file 

sudo chmod u+x slave.jar 

4) Create an empty folder which will work like workspace for jenkins to use on the slave machine 

$ mkdir workspace 

$ cd workspace 

$ pwd         ( note the path of the workspace )–    /home/ubuntu/workspace 

 ++++++++++++++++++++++++++++ 

Creating node in Jenkins 

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Open the dashboard of jenkins 

manage jenkins — manage nodes 

7) Click on new node —-  node name –  Myslave 

       – select permanent agent 

Remote root directory   -/home/ubuntu/workspace 

Label – Slave_lab 

10) Go to Launch method 

Select Launch agent via execution of command on the controller 

11) In Launch command 

ssh ubuntu@private_ip_of_slave java -jar slave.jar 

ssh ubuntu@172.31.1.107     java  -jar   slave.jar 

13) Click on save 

++++++++++++++++++++++++++++++ 

Configure job to run on slave 

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14) Select Testing Job 

15) Go to Configure  –> General Tab 

17) Check Restrict where this project can be run 

18) Enter Label Expression ( Slave_lab) 

Apply —> Save   

Run the job, In console output, we can see the job is executed in slave machine 

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