A versatile automation framework.
ShutIt is an automation tool that models a user's actions on a terminal.
It can automate any process that can be run by a human on the command line with little effort.
It was originally written to manage complex Docker builds, but is a now general-purpose automation tool that supports bash, Docker, Vagrant, ssh and arbitrary build contexts.
ShutIt can also be used as an educational tool, as it can produce videos of demos, capture reproducible steps required to set environments up, and even challenge you to get the right output (see grep-scales).
If you want to know more about Docker, see the official site or take a look at the book by the creators of ShutIt - Docker in Practice.
Some use cases:
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You like bash, want to automate tasks, have structure and support, but don't want to learn a configuration management framework that takes you away from the command line you know and love.
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Want to create complex Vagrant environments to model clusters of machines.
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Want to create instructive walkthroughs:
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Are interested in "phoenix deployment".
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Want to take your scripts and turn them into stateless containers quickly, without needing to maintain (or learn) a configuration management solution designed for moving-target systems.
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You're programmer who wants highly configurable stateless containers development, testing, and production.
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Want to build everything from source in a way that's comprehensible and auditable.
ShutIt acts as a modular and easy to use wrapper around pexpect.
Here is a simple example of a script that creates a file and a directory if they are not there already:
This builds on the docker features (see below), but allows you to interrupt the run at points of your choosing with 'challenges' for the user to overcome.
Two types of 'challenge' exist in ShutIt:
- scales
- free form
Scales tell you to run a specific command before continuing. This is useful when you want to get certain commands or flags 'under your fingers', which does not happen without dedicated and direct practice.
Free form exercises give you a task to perform, and free access to the shell. This is to give the user a realistic environment in which to hone their skills. You can check man pages, look around the directories, search for useful utils (even install new ones!). When you are finished, a pre-specified command is run to check the system is in an appropriate state. Here's an example for the basics of git:
If you use a Docker-based tutorial and you mess the environment up, the state can be restored to a known one by hitting CTRL-G.
Uses a bash build to set up n vagrant machines, and uses Landrush to give them useful hostnames accessible from the hosts and in the guest VMs.
It supports both Virtualbox and Libvirt providers.
This allows another kind of contained environment for more infrastructural projects than Docker allows for.
This example demonstrates a reproducible build that sets up Docker on an Ubuntu VM (on a Linux host), then runs a CentOS image within Docker within the Ubuntu VM.
It deposits the user into a shell mid-build to interrogate the environment, after which the user re-runs the build to add a directive to ensure ps is installed in the image.
ShutIt provides a means for auto-generation of modules (either bare ones, or from existing Dockerfiles) with its skeleton command. See here for an example.
Since a core technology used in this application is pexpect - and a typical usage pattern is to expect the prompt to return. Unusual shell prompts and escape sequences have been known to cause problems. Use the shutit.setup_prompt() function to help manage this by setting up a more sane prompt. Use of COMMAND_PROMPT with echo -ne has been seen to cause problems with overwriting of shells and pexpect patterns.
The MIT License (MIT)
Copyright (C) 2014 OpenBet Limited
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