June 2014
Intermediate to advanced
328 pages
7h 26m
English
Content preview from Extending PuppetBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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How Puppet code may change in the future
Now, hold on, stop to read, and think again about what we've seen in this chapter and particularly in the last section. Variables that define our infrastructure can be dynamically populated according to the number of hosts that have specific classes or resources. If we add hosts with these services, they can be automatically used by the other hosts.
This is what we need to configure with Puppet dynamic and elastic environments, where new services are made available to other nodes that are consequently configured.
For example, we can set a variable that returns all the IP addresses of the nodes that have Apache installed:
$web_servers_ip = query_nodes('Class[apache]', ipaddress)This variable can be used in ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.