Install Jenkins in offline mode on CentOS / RHEL

There are times when you would need to do an offline installation of the Jenkins. This may be to meet certain requirements of the workplace that you are operating in. I came across this issue some time back and internet is woefully out of articles for proper steps on this one. In this blog post, we’ll learn how to do an offline installation of Jenkins.

Install OpenJDK Java

First, we need to check what version of java is installed on the machine using:
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Checkout only selected Paths from Git Repository

In some organizations, its a common practice to put everything related to one project in one single git repository. Over the time, as the project goes on, more and more files keep getting added and it may reach a large size over the time. In such a case, you would like to check only a particular path, so that you can reduce the checkout time. It also make sense to checkout only selected paths, when you are running a continuous integration build, so that you can reduce overall build time. Even though git is very fast, but small improvements can really add up to be significant.
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Run Azure DevOps Private Agents in Kubernetes Clusters

Since in last post, we discussed on how to run Azure Pipelines agents as docker containers and configure them accordingly, the next step would be to run them on the Kubernetes platform. This kubernetes cluster can be on-premise and/or cloud and could be self managed or managed by the cloud service provider itself.

One of the reasons you may want to run them on Kubernetes is because you want better utilization of your kubernetes cluster. Another reason might be to leverage your existing knowledge of the kubernetes platform and work on it. Another reason would be to not use Microsoft hosted agents, as by default you would get only 1800 minutes of agent time to utilize, for free accounts.
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Running Azure DevOps private agents as docker containers

To run the build or deployment jobs in Azure DevOps or Azure Pipelines (formerly known as TFS and VSTS respectively), an agent is required. Microsoft provides the different types of the agents and they are hosted and managed by Microsoft only. However, it is advisable to host your own private agent for various reasons other than the cost. Microsoft provides the facility of installing agent on various OS’es like Windows, Linux, Mac OS etc. They have done a good job in terms of documentation, however you still need to perform few steps in order to set it up correctly.
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Share variables across definitions in Azure Pipelines by using variable groups

It is easy to create variables in the Azure Pipelines and they make the pipelines more generic in nature. Therefore, we can customize the release steps as per the context of the stage used. Same goes for the build definitions. Now sometimes, it may happen that the variables are common across multiple build and release definitions. In such a case, instead of defining them again and again, we can use a variable group. A variable group allows us to store values that we want to make available across multiple build and release pipelines. It also prevent duplication of values, making it easier to update all occurrences as one operation.
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