https://www.vishnurachapudi.com/ Technical write-ups on AWS, Gen AI, security and DevOps. en Fri, 31 Jul 2026 06:51:26 +0000 https://www.vishnurachapudi.com/blogs/aws-ssm/ https://www.vishnurachapudi.com/blogs/aws-ssm/ Fri, 31 Jul 2026 06:51:10 +0000 AWS Systems Manager Windows Server EC2 A real-world in-place upgrade pattern using AWSEC2-CloneInstanceAndUpgradeWindows, ENI reuse, and a few hard-earned lessons. https://www.vishnurachapudi.com/blogs/velero-eks/ https://www.vishnurachapudi.com/blogs/velero-eks/ Fri, 31 Jul 2026 06:51:10 +0000 AWS Kubernetes Velero Disaster Recovery Setting up multi-region active–passive DR for EKS using Velero, S3 Cross-Region Replication, Helm, and IRSA — with every command, every error, and every fix documented. https://www.vishnurachapudi.com/blogs/coldsnap/ https://www.vishnurachapudi.com/blogs/coldsnap/ Fri, 31 Jul 2026 06:51:10 +0000 AWS EBS Coldsnap Disaster Recovery 21 snapshots, ~5 TB of data, a degraded region, and every conventional recovery path failing one by one. Here's the tool that finally worked — and exactly how we used it. https://www.vishnurachapudi.com/blogs/aws-nova-act/ https://www.vishnurachapudi.com/blogs/aws-nova-act/ Fri, 31 Jul 2026 06:51:10 +0000 AWS Agentic AI Nova Here's exactly how I built it, what broke, and what Nova Act can actually do beyond a simple smoke test. https://www.vishnurachapudi.com/blogs/aws-s3-files/ https://www.vishnurachapudi.com/blogs/aws-s3-files/ Fri, 31 Jul 2026 06:51:10 +0000 Amazon S3 Files is generally available — mount your S3 bucket as a POSIX filesystem on EC2. No boto3. No SDK. Complete EC2 walkthrough with real screenshots. Part 1 of 2. By Vishnu Rachapudi, 14x AWS Certified Engineer. https://www.vishnurachapudi.com/blogs/aws-security-agent-blog/ https://www.vishnurachapudi.com/blogs/aws-security-agent-blog/ Fri, 31 Jul 2026 06:51:10 +0000 AWS Security Agentic AI I Pentested My Modernized Java App with AWS Security Agent — Here's What It Found https://www.vishnurachapudi.com/blogs/aws-reachability-blog/ https://www.vishnurachapudi.com/blogs/aws-reachability-blog/ Fri, 31 Jul 2026 06:51:10 +0000 AWS Networking VPC Stop Guessing. Start Tracing. — How AWS Reachability Analyzer Found Our Broken Network 10 VPCs, 1 Transit Gateway, and a jump server that couldn't reach anything. A complete walkthrough for $0.10. https://www.vishnurachapudi.com/blogs/aws-transform-blog/ https://www.vishnurachapudi.com/blogs/aws-transform-blog/ Fri, 31 Jul 2026 06:51:10 +0000 AWS Transform Agentic AI I Modernized a Legacy Java App with AWS Transform — Here's What Happened https://www.vishnurachapudi.com/blogs/aws-transfer/ https://www.vishnurachapudi.com/blogs/aws-transfer/ Wed, 01 Jul 2026 09:00:00 +0000 We set up a fully managed, no-code file sharing portal for a customer using AWS Transfer Family Web Apps — branded custom domain, SSO auth, per-user S3 Access Grants, and DR via Cross-Region Replication. https://www.vishnurachapudi.com/blogs/lambda-MicroVMs/ https://www.vishnurachapudi.com/blogs/lambda-MicroVMs/ Mon, 01 Jun 2026 09:00:00 +0000 I built a security scanner that installs untrusted packages inside isolated Lambda MicroVMs (Firecracker), runs real security tools, and uses Bedrock Kimi K2.5 to generate vulnerability reports. ~$0.01 per scan. https://www.vishnurachapudi.com/blogs/amazon-quick/ https://www.vishnurachapudi.com/blogs/amazon-quick/ Mon, 01 Jun 2026 09:00:00 +0000 Amazon Quick Desktop hands-on (Preview, April 2026): local-first architecture, MCP servers (local, remote, imported JSON), coding agent delegation via ACP, local file indexing with semantic search, knowledge graph, voice mode. Full walkthrough. https://www.vishnurachapudi.com/blogs/aws-finops-agent/ https://www.vishnurachapudi.com/blogs/aws-finops-agent/ Mon, 01 Jun 2026 09:00:00 +0000 AWS FinOps Agent is in preview and I https://www.vishnurachapudi.com/blogs/aws-transform-codebase/ https://www.vishnurachapudi.com/blogs/aws-transform-codebase/ Mon, 01 Jun 2026 09:00:00 +0000 I ran AWS/comprehensive-codebase-analysis on a real Spring Boot 2.5.14 + Java 8 + JBoss WAR. 33 files, 2,216 lines of analysis, 8 debt items found, and two clear next-step transformations — here https://www.vishnurachapudi.com/blogs/aws-finops/ https://www.vishnurachapudi.com/blogs/aws-finops/ Mon, 01 Jun 2026 09:00:00 +0000 P90 vs P99.5. Max savings vs Max performance. 14, 32, or 93-day lookback. Locking recommendations to your dedicated host family. Everything you need to tune Compute Optimizer for your actual workloads — with screenshots. https://www.vishnurachapudi.com/blogs/agentcore-harness/ https://www.vishnurachapudi.com/blogs/agentcore-harness/ Fri, 01 May 2026 09:00:00 +0000 No orchestration code. No infrastructure yak-shaving. Just a config file, the agentcore CLI, and a working agent on AWS in minutes. Here