Posts

AWS CloudWatch Synthetics Canary

-
Image
  Synthetic monitoring — often called synthetic canaries — is your system’s way of sending fake users through your application to make sure everything is working, even when no real users are around. It’s proactive, predictable, and designed to catch issues before customers feel the pain. Synthetic monitoring is automated, scripted traffic that runs on a schedule to test your application’s key flows. A “synthetic canary” is simply: A small, automated script that runs repeatedly to detect problems early — like a canary in a coal mine. It’s not tied to deployments. It’s not real user traffic. It’s not a canary release. It’s a monitoring probe . Creating Canary in AWS: I am going to configure canary for this demo endpoint  https://dummy.restapiexample.com/api/v1/employees Click on “Create Canary”. Select “Heartbeat monitoring”. If you would like to save the screenshot of the output to a S3 bucket, enable the checkbox. Select the regions from where API must be tested. ...
Post a Comment
Read more

Principal SRE - Interview Question

-
Image
  Sharing some of the interview questions for the role of Principal SRE from Apple: 1) Tell me about a production outage you’ve handled that had ambiguous symptoms. How did you narrow it down? 2) How do you decide what belongs in an SLO, and how do you avoid overengineering it? 3) You inherit a platform with strong uptime but high operational toil. What do you change first? 4) How do you handle a disagreement with product leadership when reliability work competes with feature delivery? 5) A service is scaling rapidly and latency is degrading under load. Walk me through your approach. 6) What does “good observability” mean to you in practice? 7) Describe how you would lead a major incident. 8) What’s your philosophy on automation in production operations? 9) How do you evaluate whether an architecture is resilient enough? 10) You’re the on-call SRE for a globally used service. At 2:00 AM, error rates jump from 0.2% to 8%, latency doubles, and one region is still healthy wh...
Post a Comment
Read more

Deploying a Java Code using AWS EC2

-
Image
  In this post, we will see how to deploy the JAR on a EC2 instance with Auto Scaling Group with Load Balancer. We can do the same using AWS Code Deploy with orchestration using AWS Code Pipeline. We are taking a different path. In the previous post, https://rsinfomindss.blogspot.com/2026/04/aws-codebuild.html  Once the build is stored in the S3. We have to perform the below steps in a EC2 instance to run the code. 1)        Download Java. 2)        Create a folder for the application. 3)        Download the JAR from S3. 4)        Start the JAR. I will start with creating a Launch Template. Refer to https://rsinfomindss.blogspot.com/2023/04/aws-launch-template.html  Make sure IAM EC2 instance profile is create with the permission to download S3 objects (JAR) from the EC2 instance. Refer to example below. S3 bucket "demo-java-application-a...
Post a Comment
Read more

AWS CodeBuild

-
Image
  AWS CodeBuild is a fully managed build service that compiles source code, runs tests, and produces software packages that are ready to deploy.   With CodeBuild, you don’t need to worry about provisioning and managing your own building infrastructure.   You simply provide your build project’s source code and build settings, and CodeBuild handles the rest. With AWS Code Deploy, you can avoid the manual process of deploying code, reduce the risk of errors and downtime, and improve the overall efficiency of your deployment process. For example, if you have a web application that you want to deploy , you can use CodeBuild to compile your source code, run unit tests, and produce a deployable package.   What is Buildspec file for Codebuild? The Buildspec file is a configuration file used by AWS CodeBuild to define how to build and deploy your application or software project. It is written in YAML or JSON format and contains ·     ...
Post a Comment
Read more

AWS Code Commit with Git Basics

-
Image
AWS Code Commit is a fully managed, secure, private Git repository service used to store, version, and collaborate on source code and other assets. It eliminates the need to host your own Git server and integrates tightly with AWS services. Let's start with creating a code commit repository from the AWS Console: Repository name is " book " and I am going to create a file from the console by the name called " facts.txt " with the below content. Here is the commit message for the file. Now, our file is ready. Take a note at the " Reference " as " main " which shows the file is created under main branch. No need to worry about the terms branch, commit and others. This series covers it. Now, our file is ready. Consider the file under the "main" branch is the ONE VIEWED/USED by everyone. Now, we have been asked to make changes to the file. Change the numbers from 8,848.86 to ~ 9,000 meters. In real, no organization allows to make chan...
Post a Comment
Read more