Managing multiple hosts in a single service

[Andrew Melo]

Hello, all-

I've been (unsuccessfully) looking for/thinking of a solution to the following problem and am unsuccessful, so I figured I'd ask here.

If you have a service that's across multiple hosts (say, memcached or a mysql/galera HA cluster) where each node needs to know the hostnames of the other nodes in that service, is there another way to implement this in puppet other than first applying the role to each node in the service and then having a list of hostnames stored as a variable in hiera? I'm new to puppet, so I'm unsure if there's a better practice than having to hardcode the hiera part.

Cheers,

Andrew

[Matthew Schmitt]

Using puppetdbquery (https://github.com/dalen/puppet-puppetdbquery), you could do something like this in your manifests -

$hosts = query_nodes(‘Class[memcached]', hostname)

And then loop through this in your template -

<% @hosts.sort.each do |host| -%><%= host %>:<%= @memcached_port %> <% end -%>

Matt

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[Betsy Schwartz]

The Puppet Practitioner course talks about this. Look at "exported resources" and "exported resource collectors"

Each node exports the resource then can collect the set ( probably , by doubt the puppetdb query under the hood)

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[Andrew Melo]

Thanks a lot, everyone!

> https://groups.google.com/d/msgid/puppet-users/22A5D19A-294A-4161-B9C7-AB25988AE058%40gmail.com.

>
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Andrew Melo