Forum: Cfengine Help
Subject: Re: I'm exploiting usemodule. There has got to be a better way to
define global classes?
Author: Seva Gluschenko
Link to topic: https://cfengine.com/forum/read.php?3,18623,18652#msg-18652
Well, actually, my approach differs a bit.
First, my servers are grouped into certain roles, and that grouping is
reflected in our internal management databases. Since the community edition of
Cfengine does not provide any database connectors, I'm using a Perl script
which updates groups list on a regular basis (well, it's called via Cfengine
itself on the policy host). The script writes groups.cf file which is nothing
else as
bundle common grp
{
classes:
"webserver" or => { "serverX", "serverY" };
...
}
The body common control then utilises those classes definitions to alter
bunldesequence. Accordingly, my promises are packed into more or less self
contained bundles which initially accept just "on" or "off" as their runtime
argument, so typically it looks like
body common control
{
webserver::
bundlesequence => { @(g.bstrap), apache("on"), iptables("on"),
mysql("off") };
database::
bundlesequence => { @(g.bstrap), apache("off"), iptables("off"),
mysql("on") };
}
Using such an approach, servers can be moved from group to group by simplest
change in groups configuration, so that Cfengine takes care about all the rest.
Of course, in generic database servers aren't interchangeable with webservers
due to hardware specifics, but there are indeed groups, which allow such
movements.
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