In this episode series, we will be looking at Ansible, which is an easy to use configuration management and orchestration tool. My goal for this series, is to show you what Ansible is, how it works, and the steps to get going on your own.
In this episode, we are going to play around with Ansible via four Vagrant virtual machines. We will install Ansible from scratch, troubleshoot ssh connectivity issues, review configuration files, and try our hand at common commands.
In this episode, we are going create a load balanced web cluster using Vagrant and Ansible. The goal is to show how Ansible can solve real problems by building up complex infrastructure from scratch.
In this episode, we will do a zero-downtime rolling website deployment, across a cluster of nginx web nodes, sitting behind a haproxy load balancer. We will use Ansible to orchestrate the deployment in a repeatable and consistent way.
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.
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.
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.
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.
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.
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.
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.
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.
In this episode, we are go to review a common cause of broken ssh sessions when connecting from home, coffee shops, or hotels. It can be very annoying dealing with dropped or frozen ssh connections.
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.
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.
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.