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Chef Infrastructure Automation Cookbook Second Edition

Chef Infrastructure Automation Cookbook Second Edition

By : Matthias Marschall
3.7 (6)
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Chef Infrastructure Automation Cookbook Second Edition

Chef Infrastructure Automation Cookbook Second Edition

3.7 (6)
By: Matthias Marschall

Overview of this book

This book is for system engineers and administrators who have a fundamental understanding of information management systems and infrastructure. It helps if you've already played around with Chef; however, this book covers all the important topics you will need to know. If you don't want to dig through a whole book before you can get started, this book is for you, as it features a set of independent recipes you can try out immediately.
Table of Contents (9 chapters)
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8
Index

Running the same command on many machines at once


A simple problem with so many self-scripted solutions is logging in to multiple boxes in parallel, executing the same command on every box at once. No matter whether you want to check the status of a certain service or look at some critical system data on all boxes, being able to log in to many servers in parallel can save you a lot of time and hassle (imagine forgetting one of your seven web servers when disabling the basic authentication for your website).

How to do it...

Let's try to execute a few simple commands on multiple servers in parallel:

  1. Retrieve the status of the nginx processes from all your web servers (assuming you have at least one host up and running, which has the role web_server):

    mma@laptop:~/chef-repo $ knife ssh 'role:web_server' 'sudo sv status nginx'
    
    www1.prod.example.com run: nginx: (pid 12356) 204667s; run: log: (pid 1135) 912026s
    www2.prod.example.com run: nginx: (pid 19155) 199923s; run: log: (pid 1138) 834124s
    www...
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