Sysadmin Casts - simple bite sized sysadmin screencasts (released weekly)

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Crash Course on Vagrant (revised)

Crash Course on Vagrant

In this episode, I wanted to give you a crash course on what Vagrant is, along with how I use it. Vagrant is my go to tool for launching virtual test environments, and once you start to learn how to use it, you will wonder how you ever lived without it.

Introduction to Docker

Introduction to Docker

In this episode, we are going to be looking at Docker. I have broken this episode into two sections. First, we will cover what Docker is at a high level and touch on the container workflow. Second, we will look at a live demo of Docker in action.

Introduction to Containers on Linux using LXC

Containers on Linux using LXC

In this episode, I wanted to give you an Introduction to Containers on Linux using LXC. We will look at what Containers are as a concept, why they are useful, and then move onto a live demo of what a Container looks like on a real system using LXC.

Bits Sysadmins Should Know

Bits Sysadmins Should Know

The following is a crash course on what I think goes into the making of a well rounded Linux Sysadmin. This episode is a semi-organized brain dump of bits I have learned throughout my career, which will be used as a type of guide, or road map, for future episodes on this site.

Anatomy of a SQL Injection Attack leading to Code Execution

Anatomy of a SQL Injection Attack

In this episode, I am going to show you what a SQL injection attack is, along with how it works, and then we will look at several methods to prevent them. We will also look at how a SQL injection attack can reach far beyond the database.

Learning Puppet with Vagrant

Learning Puppet with Vagrant

In this episode I wanted to introduce you to Puppet. Puppet allows you to quickly automate many sysadmin tasks, like deploying new machines, pushing changes out to existing machines, and helps you verify the configs of existing machines.

How to write an Incident Report / Postmortem

How to write an Incident Report

In this episode, I wanted to look at how to write an Incident Report, also referred to as a Postmortem. Rather than give you something of my own creation, lets look at a Google Incident Report from early 2013, which I think serves as a great example.

ZFS on Linux (Part 1 of 2)

ZFS on Linux (Part 1 of 2)

In part one, of this two part episode, we are going to look at ZFS on Linux. I will cover the basics of what ZFS is, how to create and work with ZFS pools, along with how to recover from common failures modes.

Managing Iptables with Puppet

Managing Iptables with Puppet

In this episode, I wanted to show you the Puppet Labs Firewall module. We are going to use what we learned in episode #8, about Vagrant and Puppet, and apply that to managing iptables firewall rules with Puppet.

Introduction to Linux Control Groups (Cgroups)

Linux Control Groups (Cgroups)

In this episode we are going to review Control Groups (cgroups), which provide a mechanism for easily managing and monitoring system resources, by partitioning things like cpu time, system memory, disk and network bandwidth, into groups, then assigning tasks to those groups.

LVM Linear vs Striped Logical Volumes

LVM Linear vs Striped Logical Volumes

In this episode, I wanted to look at the performance characteristics between linear and striped logical volumes using LVM. We will examine what is happening behind the scenes along with some preliminary benchmarks using an AWS i2.8xlarge instance with 8x800GB SSD disks, 244GB of RAM, and 32 virtual cores.

Git to Puppet Deployment Workflow

Git to Puppet Deployment Workflow

In this episode, we will be looking at a Git to Puppet deployment workflow pattern. I want to cover how puppet code gets from your workstation, onto production servers, and the bits in between.

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