How do jenkins slaves work




















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Phone No. Submit Now. To view on your browser, click here. I have used just 1 executor for testing purpose, but a good value to start with would be the number of CPU cores on the machine. You can check the server stat and then define the number of executors. Remote root directory : An agent needs to have a directory dedicated to Jenkins. Specify the path to this directory on the agent. This should be a path local to the agent machine. There is no need for this path to be visible from the master.

Labels : Labels or tags are used to group multiple agents into one logical group. Multiple labels must be separated by a space.

For example, linux docker would assign two labels to the agent: linux and docker. Usage : Controls how Jenkins schedules builds on this node. Utilize this node as much as possible- This is the default and normal setting. In this mode, Jenkins uses this node freely. This means that the agent need not be reachable from the master; the agent just needs to be able to reach the master. If you have enabled security via the Configure Global Security page, you can customize the port on which the Jenkins master will listen for incoming JNLP agent connections.

Use this when the master is capable of remotely executing a process on another machine, e. The slave needs to be reachable from the master, and you will have to supply an account that can log in on the target machine. No root privileges are required. This is the one which i am using for my slave configuration. It could be a problem with SSH lib used by Jenkins which does not support newer ciphers like ecdsa-sha2-nistp Its not advisable to select as it may open the path for attackers.

Suitable for managing Windows slaves. Slaves need to be IP reachable from the master. Keep this slave on-line as much as possible : This one is the default and normal setting. In this mode, Jenkins tries to keep the slave on-line as much as possible. If Jenkins can start the slave without user assistance, it will periodically attempt to restart the slave if it is unavailable. Jenkins will not take the slave off-line. Take this slave on-line when in demand and off-line when idle : In this mode, if Jenkins can launch the slave without user assistance, it will periodically attempt to launch the slave while there are unexecuted jobs else the slave will be taken off-line by Jenkins.

Environment variables defined here will be made available to every build executed by this agent, and will override any environment variables that have the same Name as those defined on the Configure System page. For Tool Locations, you can specify the location of certain tools on this node, overriding the global configuration You may prefer to use automatic tool installers instead, removing the need to configure each node separately.

Your new Jenkins Slave is up and running and ready to take the builds. As I have mentioned and you might have noted that Jenkins master do have their build executors and until we turn them off, Jenkins can use those executors to perform builds based on the CPU stats, memory and other factors. This technique is also helpful when you have some jobs to be run on different platforms, with specific configurations, etc like we discussed in the beginning of this article.

Choose the appropriate parameter s [Based on your project configurations] and click on Build. Then click on Build number and check the Console Output , where you will find that build is running on newly created node and is successful. You can also define more than one labels i. To do that,. Click on button to know all the expression details.

And this time you will find the job ran on master build executor since we have given a choice to Jenkins to choose any build executor of master or slave node1. I was actually waiting for this master-slave setup after reading your previous article on Jenkins installation.

Thanks a bunch!! You have described it very well, specially the issue with ssh host key verification. Nice work. Thanks for this wonderful article, it has actually helped me to configure my jenkins node on linux machine but I am facing error with windows jenkins node, can you please write on that as well? Hi Tom, Sorry for delayed response. Thanks very much. This is an excellent article providing insight into the Master-Slave concept of Jenkins.

Can anyone help me how to add windows client in jenkins and deploy code on windows. NET project via dotnet build tool on another Windows machine a Node , so how I can execute dotnet build tool or cmd on that Windows Node? Thank you. Hi Su, Thanks for your query. Net project and use msbuild, etc for building the project. Hi Rinku, Thanks for your query. This does not apply to the Jenkins master — setting the number of executors to zero will prevent any builds from being executed on the master.

As I highlighted in the article, a good value to start with would be the number of CPU cores on the machine. Hope this helps.. We need to deploy war file in a centralized system, in KIOSK machine we are deploying war file in each system, how to resolve this issue , we are looking for a deployment centrally and all nodes in same network can access that. Hi Abhay, Thanks for posting your query. Over 2 million developers have joined DZone. Jenkins Configure Master and Slave Nodes.

Learn about the importance of the master and slave nodes and set up a sample freestyle project. Like 3. Join the DZone community and get the full member experience.

Join For Free. Take a look at master and slave nodes in Jenkins. Jenkins Master and Slave Concept A Jenkins master comes with the basic installation of Jenkins, and in this configuration, the master handles all the tasks for your build system. You may also enjoy: Getting Started With Jenkins: The Ultimate Guide If you are working on multiple projects you may run multiple jobs on each and every project. Jenkins Master and Slave Architecture The Jenkins master acts to schedule the jobs and assign slaves and send builds to slaves to execute the jobs.

Click on Manage Nodes. Select New Node and enter the name of the node in the Node Name field. Select Permanent Agent and click the OK button. Initially, you will get only one option, "Permanent Agent. Enter the required information.

Some required fields include: Name: Name of the Slave.



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