By Craig Sebenik, Thomas Hatch

Get a whole advent to Salt, the generally used Python-based configuration administration and distant execution software. This functional consultant not just exhibits method directors the best way to deal with advanced infrastructures with Salt, but in addition teaches builders how you can use Salt to set up and deal with their applications.

Written by way of Salt specialists, this booklet offers the knowledge you must installation Salt in a construction infrastructure immediately. You'll additionally the best way to customise Salt and use salt-cloud to control your virtualization. when you have adventure with Linux and information codecs equivalent to JSON or XML, you're able to get started.

- comprehend what Salt can do, and get a high-level review of easy commands
- find out how execution modules allow you to engage with many platforms at once
- Use states to outline the way you desire a host or a collection of hosts to look
- Dive into grains and pillars, Salt's uncomplicated info elements
- keep an eye on your infrastructure programmatically by means of extending Salt Master's functionality
- expand Salt with customized modules, the Jinja templating language, and Python scripts

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I use it to verify and debug almost every state (SLS file) I write. It is extremely handy to see how Salt parses the SLS file and if it matches every‐ thing I expect. show_sls, without affecting any minions. So it is a very handy tool that you should learn. We can run this state against minion2 and we should see very little change since we already added that user. 926 ms Changes: ---------fullname: Wilma Flintstone uid: 2001 Summary ----------Succeeded: 1 (changed=1) Failed: 0 ----------Total states run: 1 The important thing to notice is that after the state is applied, Salt will show you what changed.

If you were to list all of the modules available on every host, you would not see either of these. That’s because both modules expose their name as simply pkg. py is loaded on Ubuntu. doc, will know only about pkg, not yumpkg nor aptpkg. If you need to look up the specifics of the modules, either in the code or on the Web, you will need to know the full Python module name. 1 These are pretty vanilla versions of each operating system. So you would expect some similarities, but a great number of differences.

Run allows you to change the current working directory using the cwd keyword argument. run cwd=/usr 'pwd' local: /usr The Salt daemons are normally run as the root user. example: vagrant Another powerful keyword argument is env, which allows you to set an environment variable. The big difference with env is that it also needs to set a key equal to a value. So you need to set env=key=value. Obviously, that format would be very difficult to parse. run env='{foo: bar}' 'echo $foo' [INFO ] Executing command 'echo $foo' in directory '/root' local: bar 32 | Chapter 3: Execution Modules: The Functional Foundation You will see this pattern in other functions.

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