Tag: Linux

Deploying a Private Cloud at Home — Part 5

Today’s blog post is part five of seven in a series dedicated to Deploying Private Cloud at Home, where I will be demonstrating how to configure Compute node and OpenStack services on the compute node. We have already installed the MySQL Python…

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Debugging High CPU Usage Using Perf Tool and vmcore Analysis

There are several tools and technologies available to debug deeper into high CPU utilization in a system; perf, sysrq, oprofile, vmcore, and more. In this post, I will narrate the course of debugging a CPU utilization issue using technologies like perf…

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Deploying a Private Cloud at Home — Part 4

Today’s blog post is part four of seven in a series dedicated to Deploying Private Cloud at Home, where I will be demonstrating how to configure Imaging and compute services on controller node. See my previous blog post where we began configuring…

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Deploying a Private Cloud at Home — Part 3

Today’s blog post is part three of seven in a series dedicated to Deploying Private Cloud at Home, where I will demonstrate how to configure OpenStack Identity service on the controller node. We have already configured the required repo in part two…

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Deploying a Private Cloud at Home — Part 2

Today’s blog post is part two of seven in a series dedicated to Deploying Private Cloud at Home, where I will demonstrate how to do basic configuration setup to get started with OpenStack. In my first blog post, I explained why I…

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Deploying a Private Cloud at Home — Part 1

Today’s blog post is part one of seven in a series dedicated to Deploying a Private Cloud at Home. In my day-to-day activities, I come across various scenarios where I’m required to do sandbox testing before proceeding further on the…

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Some Observations on Puppetrun with Foreman

After joining Pythian I was introduced to several configuration management systems and Puppet was one of them. Foreman is a system management tool which can be integrated with Puppet to manage puppet modules and to initiate puppet runs on hosts…

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Auditing Files in Linux

Stat command in Linux can be used to display a file or a file system status. I came across an issue in RHEL4 where a file’s ‘Change time’ is far ahead than the ‘Modification time’ without a change in uid,…

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Comparing CPU Throughput of Azure and AWS EC2

After observing CPU core sharing with Amazon Web Services EC2, I thought it would be interesting to see if Microsoft Azure platform exhibits the same behavior. Signing up for Azure’s 30-day trial gives $200 in credit to use over the…

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A Simple Way to Monitor Java in Linux

A quick and easy way to know what is it inside Java process that is using your CPU. Using just Linux command line tools and JDK supplied command line utilities.

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