Jenkins Jenkins Distributed Builds 2

Question 1

How do you add a new permanent agent in Jenkins?

Accepted Answer

Go to Manage Jenkins > Manage Nodes and Clouds > New Node

Answer

Permanent agents are added through Manage Jenkins > Manage Nodes and Clouds > New Node, where you configure the agent's connection method, label, and root directory.

Question 2

What does 'number of executors' define on a Jenkins agent?

Accepted Answer

The number of concurrent builds the agent can run simultaneously

Answer

Each executor on an agent represents one concurrent build slot; an agent with 4 executors can run 4 builds simultaneously.

Question 3

In Jenkins, what is an 'ephemeral agent'?

Accepted Answer

An agent that is dynamically provisioned for a single build and destroyed afterward

Answer

Ephemeral agents (common with Kubernetes or Docker plugins) are created on-demand for each build and removed after the build completes, ensuring clean environments.

Question 4

What is the Jenkins 'availability' strategy `Take this agent offline when idle` used for?

Accepted Answer

Automatically disconnect the agent after a period of inactivity to save resources

Answer

This availability strategy disconnects the agent after a configurable idle delay, useful for cloud or expensive agents to reduce costs when not in use.

Question 5

How does the Jenkins SSH Build Agents plugin connect to an agent?

Accepted Answer

The controller SSHes into the agent and starts the agent process

Answer

With the SSH Build Agents plugin, the Jenkins controller initiates an SSH connection to the agent machine and remotely starts the Jenkins agent JAR process.

Jenkins Practice Test

Jenkins Practice Test

Jenkins Jenkins Distributed Builds 2