Puppet Tutorial for Linux: Powering up with Puppet. Important. This tutorial is rather out of date, and I’m afraid I haven’t had time to update it, because I’ve been working on a whole book that’ll teach you Puppet! The Puppet 3 Beginners Guide is available now. I recommend you check it out, but I’ll keep the tutorial content here for historical interest, if nothing else. If you’re a more advanced Puppet user, you might prefer to go straight to The Puppet Cookbook.

Puppet tutorial series. Puppet tutorial part 1: Powering up with Puppet 2. This Linux Puppet tutorial will help you install Puppet for the first time and start managing your servers.

Rightly so, because Linux automation, devops and CM tools like Puppet and Chef can save you an enormous amount of time and money and help you build a really reliable and automated Linux infrastructure. In this tutorial, I’ll show you how to set up Puppet on Linux. If you’re a sysadmin, or anyone else who manages a bunch of servers, CM tools can help you create patterns or recipes which you can use to build lots of identical servers, or cloud instances, or re- use in different places and for different applications. Automating Linux servers is a snap with Puppet.

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Puppet can manage thousands of servers as easily as just one or two - but let’s start with one or two! If you’re a developer, Linux configuration management lets you write code which describes how servers should be set up - saving you the time and effort of doing it manually, and letting you create large, load- balanced groups of interchangeable servers which are guaranteed to be identically configured.

Installing Puppet. So much for the sales pitch. Let’s take a look at the steps required to get up and running with your first Puppet install (we’ll come to Chef in a later article).

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Puppet example. For this Puppet example install, we’re going to assume you’re using an Ubuntu Linux machine. You can use a virtual machine for this, running in VMWare, Virtual. Box or Xen if you like, or just a spare Linux box that happens to be lying around the office. First, we need to install Puppet itself (you’ll need to log in as root or sudo su - on your server). The code snippets that tell Puppet how a machine should be configured are called manifests - like a shipping manifest, it tells Puppet what things (packages, users, files and other resources) should be present, and what they should contain.

The first thing to do is create a directory structure to hold your manifests. Puppet itself is not too fussy about how these are laid out, but we’re going to follow the Puppet community’s best practices document and use the recommended layout there. To save time, you can download a (nearly) empty template layout.

To use this. # wget http: //bitfieldconsulting. You should now have an /etc/puppet directory with two subdirectories: modules and manifests. Roughly speaking, modules is where Puppet code lives, and manifests is where we specify which code should be applied to each machine under Puppet’s control. Starting the Puppetmaster. Puppet comes in two parts: a server (the Puppetmaster) which listens for connections from clients and then tells them what manifest they should have, and a client program, which runs on each machine under Puppet control and connects to the Puppetmaster to get its manifest. In our example, we’re running the master and client on the same machine, so let’s start the server. Ddd Pool Best Of Billiards. Running the Puppet client.

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With the Puppetmaster running, we can now check that everything is working as it should by running the client. Caching catalog for localhost. Applying configuration version '1. Finished catalog run in 1.

Creating Puppet classes. While technically we have just applied a Puppet manifest to the machine, it’s not a very interesting one, as it does nothing at all. Let’s create a manifest that manages a simple service: NTP (the Network Time Protocol). NTP is a daemon which keeps the machine’s clock synchronised with reference servers on the Internet.

First we’re going to create a class for the NTP service (if you haven’t done any object- oriented programming, a class is just a named chunk of code which we can refer to). I’ve created a (nearly) empty template for you for the NTP class, so go ahead and edit the file /etc/puppet/modules/ntp/manifests/ntp. Currently it looks like this. We’ve now created a Puppet manifest which will manage the NTP daemon (ntp). Change the service resource accordingly. To do that, edit the file /etc/puppet/manifests/nodes.

You’ll see a template that looks like this. You’ve now told Puppet that the server myserver (or whatever your machine is named) should have the NTP manifest applied to it. Applying changes with Puppet. Aircrack Ng Hack Wifi 2012 Rare. When you run Puppet again. Caching catalog for localhost.

Applying configuration version '1. Service? Puppet looked up the manifest for myserver and found this. Your system may or may not have ntp already installed, but if not, Puppet will install it. Puppet checks to see if the service is started, and if it’s not, it starts the service for you.

If you run Puppet again now. Caching catalog for localhost. Applying configuration version '1. Finished catalog run in 0. Puppet does nothing, because the manifest is satisfied. Puppet manifests are declarations. Puppet manifests are not a set of instructions, in the way that a shell script or a Ruby program is.

They’re a declaration of how the world should be (or that part of it under Puppet’s control, anyway). If reality differs from the manifest, Puppet takes steps to adjust reality.

This means that Puppet isn’t just useful for building machines. It can also check them regularly to make sure that nothing important has changed, and if it has, to correct it. If you stop the NTP service manually and then run Puppet again, you’ll find Puppet restarts it.

Conversely, if you decide you no longer want NTP running on your machines, you can change the word running to stopped, and Puppet will enforce this policy on every machine that includes the NTP manifest (which could be hundreds or even thousands of servers). Imagine making a change like that to a large production network by logging in to each machine in turn and running the necessary commands manually. Not only would it be tedious and time- consuming, but if you got interrupted halfway through, you might not remember which machines you’d fixed, and your whole network would be in an inconsistent and unknown state. In our next thrilling episode. You’ve just powered up your system with Puppet! Next time in Puppet Tutorial part 2: Client and Server, we’ll look at how to set up Puppet to control multiple machines. If you’ve got any comments on this Puppet tuto, do let me know!

Puppet links. Puppet books. If you’re excited about Puppet and want to learn more, may I modestly recommend the Puppet 2.

Cookbook? The Puppet 2. Cookbook takes you beyond the basics to explore the full power of Puppet, showing you in detail how to tackle a variety of real- world problems and applications. At every step it shows you exactly what commands you need to type, and includes full code samples for every recipe.