Determining which master an agent is connected to

[Daren Arnold]

Hello,

Newb question here.  I have inherited a PE 3.3 setup that uses a Puppet master hub, spoke and about 100 agents. The agents were installed at various times - some were connected directly to the hub and others connected to the spoke.

Is there a way to determine which agents are connected to the hub versus the spoke? I couldn’t find a fact that reflected the Puppet master.  Also, the console doesn’t seem to provide this information.

Thanks for any help you can provide.

Daren

[Tony Thayer]

The agents should have the master defined in their puppet.conf file. Failing that, you can manually run the agent on a system with "puppet agent -t --debug" and look for entries that look like "Caching connection for https://puppet.local:8140"

- Tony

[Daren Arnold]

Tony,

Thanks for your reply.  I was hoping to avoid inspecting all of the agents (either puppet.conf files or running puppet agent -t --debug) manually.  I am looking into an approach that involves creating an external fact to query the value of 'server' in the puppet.conf.  That may be what you were suggesting?  Either way, I'll post how that option goes.

-Daren

[Tony Thayer]

If you already have SSH shared keys, a simpler method may be to just run a remote ssh command through a loop. For instance, if you have the hostnames in a text file named servers.txt, you could run something like

while read -u10 HOST ; do echo $HOST; ssh $HOST "grep server /etc/puppet/puppet.conf" ; done 10< servers.txt

This was taken from http://unix.stackexchange.com/questions/107800/using-while-loop-to-ssh-to-multiple-servers

- Tony

[Ramin K]

There is already a set of server facts available during a Puppet run.

https://docs.puppetlabs.com/puppet/latest/reference/lang_facts_and_builtin_vars.html#puppet-master-variables

Because you're running PE you should be able to query which servers are
using which server through mcollective.

Ramin

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[Daren Arnold]

Hi Ramin,

Is this feature/variable turned on by default in PE 3.3?  I am unable to see a fact for 'servername'.  I am probably trying to access it incorrectly.  To test, I issue an mco command:

mco inventory <hostname>

I don't see servername available.

Thanks for any additional help you can provide.

Daren

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[Ramin K]

I'm not a PE user, but the config for the OSS version has a blacklist to
remove facts like uptime, path, ps, etc from the facts.yaml. I'd expect
PE to follow the same process. Might be worth opening a support request.

Ramin

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[Wil Cooley]

The $servername variable isn't actually a fact -- it's set by the server itself while compiling the catalog, so from the perspective of writing manifests it smells a lot like a fact.

Wil

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