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Hadoop Cluster Automation Using Ironfan

Recently, we faced a unique challenge - setup DevOps and management for a relatively complex Hadoop cluster on the Amazon EC2 Cloud. The obvious choice was to use a configuration management tool. Having extensively used Opscode's Chef and given the flexibility and extensibility Chef provides;...

Changing the Date Time on Amazon’s EC2 Instance

Amazon Elastic Compute Cloud (EC2) provides scalable virtual private servers using Xen. The instances running on Xen sync their wall clock periodically with the underlying hypervisor. For changing the datetime settings, few extra configurations are required. On a simple Linux Machine the date and time can...

Custom Metrics in Amazon CloudWatch

Amazon CloudWatch is an Amazon Web Services utility allowing monitoring of various components like EC2 instances, EBS volumes and the Elastic Load Balancer. For EC2 instances, we can monitor CPUUtilization, DiskReadBytes, DiskReadOps, DiskWriteBytes, NetworkIn and NetworkOut. More often than not, end-users would want to monitor...

Booting A Custom Kernel in EC2

Amazon EC2 has recently released PV-GRUB loader supported kernels that allow one to boot their kernels. This PV-GRUB loader simply chain-boots the kernel provided in the associated AMI (Amazon Machine Image). This results in your instance running the kernel in the AMI instead of the kernel specified in...