Update Interview_Questions.md

g0rducci · Feb 3, 2023 · 7e75bca · 7e75bca
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Showing 1 changed file with 22 additions and 4 deletions.
diff --git a/Interview_Questions.md b/Interview_Questions.md
@@ -51,11 +51,15 @@ Q: How do you store/secure/handle secrets in Jenkins ?
 
 A: Again, there are multiple ways to achieve this, 
    Let me give you a brief explanation of all the posible options.
-   
+```  
    - Credentials Plugin: Jenkins provides a credentials plugin that can be used to store secrets such as passwords, API keys, and certificates. The secrets are encrypted and stored securely within Jenkins, and can be easily retrieved in build scripts or used in other plugins.
+   
    - Environment Variables: Secrets can be stored as environment variables in Jenkins and referenced in build scripts. However, this method is less secure because environment variables are visible in the build logs.
+   
    - Hashicorp Vault: Jenkins can be integrated with Hashicorp Vault, which is a secure secrets management tool. Vault can be used to store and manage sensitive information, and Jenkins can retrieve the secrets as needed for builds.
+   
    - Third-party Secret Management Tools: Jenkins can also be integrated with third-party secret management tools such as AWS Secrets Manager, Google Cloud Key Management Service, and Azure Key Vault.
+```
 
 Q: What is latest version of Jenkins or which version of Jenkins are you using ?
 
@@ -65,10 +69,15 @@ Q: What is shared modules in Jenkins ?
 
 A: Shared modules in Jenkins refer to a collection of reusable code and resources that can be shared across multiple Jenkins jobs. This allows for easier maintenance, reduced duplication, and improved consistency across multiple build processes.
    For example, shared modules can be used in cases like:
+```
         - Libraries: Custom Java libraries, shell scripts, and other resources that can be reused across multiple jobs.
+        
         - Jenkinsfile: A shared Jenkinsfile can be used to define the build process for multiple jobs, reducing duplication and making it easier to manage the build process for multiple projects.
+        
         - Plugins: Common plugins can be installed once as a shared module and reused across multiple jobs, reducing the overhead of managing plugins on individual jobs.
+        
         - Global Variables: Shared global variables can be defined and used across multiple jobs, making it easier to manage common build parameters such as version numbers, artifact repositories, and environment variables.
+```
 
 Q: can you use Jenkins to build applications with multiple programming languages using different agents in different stages ?
 
@@ -85,16 +94,23 @@ Overall, Jenkins is a flexible and powerful tool that can be used to build appli
 Q: How to setup auto-scaling group for Jenkins in AWS ?
 
 A: Here is a high-level overview of how to set up an autoscaling group for Jenkins in Amazon Web Services (AWS):
-
+```
     - Launch EC2 instances: Create an Amazon Elastic Compute Cloud (EC2) instance with the desired configuration and install Jenkins on it. This instance will be used as the base image for the autoscaling group.
+    
     - Create Launch Configuration: Create a launch configuration in AWS Auto Scaling that specifies the EC2 instance type, the base image (created in step 1), and any additional configuration settings such as storage, security groups, and key pairs.
+    
     - Create Autoscaling Group: Create an autoscaling group in AWS Auto Scaling and specify the launch configuration created in step 2. Also, specify the desired number of instances, the minimum number of instances, and the maximum number of instances for the autoscaling group.
+    
     - Configure Scaling Policy: Configure a scaling policy for the autoscaling group to determine when new instances should be added or removed from the group. This can be based on the average CPU utilization of the instances or other performance metrics.
+    
     - Load Balancer: Create a load balancer in Amazon Elastic Load Balancer (ELB) and configure it to forward traffic to the autoscaling group.
+    
     - Connect to Jenkins: Connect to the Jenkins instance using the load balancer endpoint or the public IP address of one of the instances in the autoscaling group.
+    
     - Monitoring: Monitor the instances in the autoscaling group using Amazon CloudWatch to ensure that they are healthy and that the autoscaling policy is functioning as expected.
 
  By using an autoscaling group for Jenkins, you can ensure that you have the appropriate number of instances available to handle the load on your build processes, and that new instances can be added or removed automatically as needed. This helps to ensure the reliability and scalability of your Jenkins environment.
+```
 
 Q: How to add a new worker node in Jenkins ?
 
@@ -106,12 +122,14 @@ A: Using the CLI,
    `java -jar jenkins-cli.jar install-plugin <PLUGIN_NAME>`
 
   Using the UI,
-   - Click on the "Manage Jenkins" link in the left-side menu.
-   - Click on the "Manage Plugins" link.
+
+   1. Click on the "Manage Jenkins" link in the left-side menu.
+   2. Click on the "Manage Plugins" link.
 
 Q: What is JNLP and why is it used in Jenkins ?
 
 A: In Jenkins, JNLP is used to allow agents (also known as "slave nodes") to be launched and managed remotely by the Jenkins master instance. This allows Jenkins to distribute build tasks to multiple agents, providing scalability and improving performance.
+
    When a Jenkins agent is launched using JNLP, it connects to the Jenkins master and receives build tasks, which it then executes. The results of the build are then sent back to the master and displayed in the Jenkins user interface.
 
 Q: What are some of the common plugins that you use in Jenkins ?