Writing a puppet show

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Writing a puppet show

Introduction Puppet is an open source IT management tool written in Ruby, used for datacenter automation and server management at Google, Twitter, the New York Stock Exchange, and many others.

It is primarily maintained by Puppet Labs, which also founded the project. Puppet can manage as few as 2 machines and as many as 50, on teams with one system administrator or hundreds.

writing a puppet show

Puppet is a tool for configuring and maintaining your computers; in its simple configuration language, you explain to Puppet how you want your machines configured, and it changes them as needed to match your specification. As you change that specification over time—such as with package updates, new users, or configuration updates—Puppet will automatically update your machines to match.

If they are already configured as desired, then Puppet does nothing. In general, Puppet does everything it can to use existing system features to do its work; e. One of the guiding goals in Puppet is to have the work it does make sense whether you are looking at Puppet code or the system itself, so following system standards is critical.

Puppet comes from multiple traditions of other tools. In the open source world, it is most influenced by CFEngine, which was writing a puppet show first open source general-purpose configuration tool, and ISconf, whose use of make for all work inspired the focus on explicit dependencies throughout the system.

In the commercial world, Puppet is a response to BladeLogic and Opsware both since acquired by larger companieseach of which was successful in the market when Puppet was begun, but each of which was focused on selling to executives at large companies rather than building great tools directly for system administrators.

Puppet is meant to solve similar problems to these tools, but it is focused on a very different user. For a simple example of how to use Puppet, here is a snippet of code that will make sure the secure shell service SSH is installed and configured properly: Note that we've specified dependencies between the resources, so that we always perform any work in the right order.

This class could then be associated with any host to apply this configuration to it. Notice that the building blocks of a Puppet configuration are structured objects, in this case package, file, and service.

We call these objects resources in Puppet, and everything in a Puppet configuration comes down to these resources and the dependencies between them. A normal Puppet site will have tens or even hundreds of these code snippets, which we call classes; we store these classes on disk in files called manifests, and collect them in related groups called modules.

For instance, you might have an ssh module with this ssh class plus any other related classes, along with modules for mysql, apache, and sudo. Most Puppet interactions are via the command line or long-running HTTP services, but there are graphical interfaces for some things such as report processing.

Puppet Labs also produces commercial products around Puppet, which tend more toward graphical web-based interfaces. Puppet's first prototype was written in the summer ofand it was turned into a full-time focus in February of It was initially designed and written by Luke Kanies, a sysadmin who had a lot of experience writing small tools, but none writing tools greater than 10, lines of code.

In essence, Luke learned to be a programmer while writing Puppet, and that shows in its architecture in both positive and negative ways. Puppet was first and foremost built to be a tool for sysadmins, to make their lives easier and allow them to work faster, more efficiently, and with fewer errors.

The first key innovation meant to deliver on this was the resources mentioned above, which are Puppet's primitives; they would both be portable across most operating systems and also abstract away implementation detail, allowing the user to focus on outcomes rather than how to achieve them.

This set of primitives was implemented in Puppet's Resource Abstraction Layer. Puppet resources must be unique on a given host. This prevents different parts of your configurations from conflicting with each other, and you find out about those conflicts very early in the configuration process.

We refer to these resources by their type and title; e.

writing a puppet show

You can have a package and a service with the same name because they are different types, but not two packages or services with the same name.Puppet Plays - Script Writing & Puppet Show Presentation (PBL) Puppet Play Project Overview Choose an appropriate topic, theme or life lesson for a K-2 audience, and write a short puppet play that will be performed in front of that audience.

Writing tasks; Writing plans. Plan execution functions; Because Puppet Bolt executes scripts across your infrastructure, it is important to be aware of certain vulnerabilities, and to code tasks in a way that guards against remote code execution.

For example, to run the mysql::sql task to show tables from a database called mydatabase.

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Puppet Tutorial By Alessandro Franceschi Example42 Puppet Essentials - Overview Introduction to Puppet Configuration management tools Puppet Ecosystem and related software What is Puppet.

RubiStar is a tool to help the teacher who wants to use rubrics, but does not have the time to develop them from scratch. Supports the Common Core.

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Shadow Puppet can be incorporated across your curriculum to support these Common Core State Standards. Check out the 20+ . Sasori (サソリ, Sasori), renowned as Sasori of the Red Sand (赤砂のサソリ, Akasuna no Sasori), was an S-rank missing-nin from Sunagakure's Puppet Brigade and a member of Akatsuki, where he was partnered with Orochimaru and later Deidara.

When Sasori was .

The Architecture of Open Source Applications (Volume 2): Puppet