How To Add Jenkins Node

 Jenkins Node Add

 

Hello All,

We all know what is Jenkins and the working on Jenkins and its plugins. Its one of the widely used open source automation server, which helps in building, deploying and automating any project.

In this post we will see how to add new node to jenkins cluster. 

before we start this, we assume that you already have a jenkins server running/installed.

Prerequisites

You should have Sudo access 

On the Agent machine:

1- Install the necessary packages

install Java jdk openjdk

# sudo yum install java-1.8.0-openjdk

2- Create a user on the agent to be used by Jenkins

Create  user with name jenkins with /var/lib/jenkins as home directory.

# sudo useradd -d /var/lib/jenkins jenkins

# passwd jenkins

3- Generate an ssh key

switch to jenkins user and create ssh key.

# su - jenkins

# ssh-keygen -t rsa -C "Jenkins agent key"

Generating public/private rsa key pair.

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /var/lib/jenkins/.ssh/id_rsa.

Your public key has been saved in /var/lib/jenkins/.ssh/id_rsa.pub.

The key fingerprint is:

SHA256:5qJWiPnvv+Gozm8iP+Ered03HgLJW2eyW0tzA5r1YYU jenkins ssh slaves

The key's randomart image is:

+---[RSA 2048]----+

|                 |

|             .   |

|            E .  |

|     . .     .   |

|   o .+ S = o    |

|  o o .* O + .   |

|   + +o.B = +    |

|  +.B.o+.*o= .   |

|   BBX=.=+o.     |

+----[SHA256]-----+

 

– Add the public SSH key id_rsa.pub to the list of authorized_keys file like below:

# cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

# chmod 600 ~/.ssh/authorized_keys

– Copy the private SSH key ~/.ssh/id_rsa 

In Jenkins Server:

1- Go to Manage Jenkins -> Manage Nodes:

2-  click on the New Node button:

3- setup the name of the agent, select Permanent agent and click on the Ok button:

4- After creating the new node, you have to configure the node settings. Fill in the Remote root directory with a path the user on the agent is allowed to write to, set the Host value with the hostname of the agent, and press the Add button for Credentials :

5- select SSH Username with private key option, fill the Username value with the user account on the agent machine, in our example is jenkins, and choose Private Key -> Enter directly and paste the key , and give an ID and a useful Description for this credential. Finally click the add button.

6- Select the Manually trusted key Verification Strategy value of the Host Key Verification Strategy menu and click save button.

 7. By following above steps you will be able to add new node successfully. go the the nodes section and you will see

new node added with red cross mark,

click on it to see the progress. if you encounter any error you will see logs button on dashboard to check log.

 Please let me know if you face any issue while adding node. I will try my best to help you.

Thank you !!! 

Other Topics: Script to monitory disk usage | How to create a vm using snapshot in Azure | Top linux commands | GIT | Install Kubernetes On Ubuntu

 

 

 

 

 

 

 

 

 

 

 

 

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