Shared AWS accounts across multiple teams require careful access controls to prevent costly mistakes. A common requirement is allowing developers to view and start all instances, but restrict stopping to only non-production resources. IAM policies with resource tags give you fine-grained control over who can do what. The Problem You have 50 production VMs and…
Before expanding your root partition and filesystem: Back up your data using cloud snapshots or external backup tools. Partition and filesystem resizing can cause data loss if misconfigured. Have root access to the VM. Ensure your cloud provider has already expanded the underlying block device (EBS volume for AWS, persistent disk for GCP, managed disk…
Hadoop 2.x reached end-of-life in 2016. This guide covers setup for learning purposes and legacy system maintenance only. For production deployments, use Hadoop 3.x or later, which includes performance improvements, better YARN scheduling, HDFS erasure coding, and improved security. Cloud-managed options like AWS EMR, Google Dataproc, and Azure HDInsight eliminate most operational overhead. This guide…
paravirt_ops is an abstraction layer in the Linux kernel that allows the same binary to run efficiently on both bare metal and various hypervisors through runtime patching. Rather than compiling separate kernels for each platform, paravirt_ops lets the kernel detect its environment at boot and optimize itself accordingly. The Core Problem paravirt_ops Solves Traditional virtualization…
Hadoop 1.x reached end-of-life in 2014 and is no longer maintained. This post documents a deprecated architecture for historical reference only. For new deployments, use Hadoop 3.x+ with YARN, which offers significant improvements in resource management, multi-tenancy, and reliability. See the Apache Hadoop documentation for current versions. For managed services, consider AWS EMR, Google Dataproc,…