Even if you manage just a handful or two of servers, Puppet can already help you to save loads of time and ensures all your systems run in the desired state.
Somehow, I could not find very many or good manuals on how to set up your own (basic) Puppet server on Debian, so I decided to write my own.
The installation in Debian (10 or later) is – as always in Debian – straight forward. Just run an
apt install puppet puppet-master vim-puppet
That last package is not really needed but comes in really handy when editing your Puppet manifests in vim and you want syntax highlighting. While this would be more needed on a git client it also is nice to have on the Puppet master.
As for the main configuration file
/etc/puppet/puppet.conf I leave the Debian standard for what it is.
Your manifests should be in
/etc/puppet/code/ and the basic structure looks like this:
/etc/puppet/code ├── environments │ └── production │ └── manifests └── modules ├── module1 │ ├── examples │ ├── files │ └── manifests ├── module2 │ ├── examples │ ├── files │ └── manifests └── moduleX ├── examples ├── files └── manifests
manifests directory contains at least your
init.pp and possibly other Puppet files, except the environment manifest. The
/etc/puppet/code/environments/production/manifests/site.pp very basically looks like this:
# DeskTux main Puppet Configuration include module1 include module2 include moduleX
In the modules, the
files directory is not necessary unless you have files to manage and the
examples directory should contain a basic
init.pp that looks like this:
That way, you can easily test the code of that module by using
puppet apply -t init.pp.
Of course, before testing your code, you should first run it through
puppet parser validate and
puppet-lint. However, this is not a Puppet code manual, you should check their excellent documentation for that.
Of course, your Puppet master will be useless if it only manages itself. To connect clients to your Puppet master, make sure it is reachable on port 8140/TCP (both IPv4 and IPv6 work).
On the client, install Puppet by running
apt install puppet (and enable it in systemctl, or write a manifest for that ). Then edit the
/etc/puppet/puppet.conf and add this section:
[agent] server = your.puppet.server
root@puppet:~ # puppet cert list "client.system.tld" (SHA256) 00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF:00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF
To accept that certificate just run
puppet cert sign client.system.tld and you are good to go. From now on, that system will be managed by your Puppet master. To test this you can run a
puppet agent -t on the client.
In case you need to remove (decommission) a client, you can list all available certificates with
puppet cert list -a and then
puppet cert clean <client.name.tld>. Don't forget to remove that client from backup and monitoring
Now, it might be a good idea to manage your Puppet code from your workstation using git. That way you do not need to log in to the Puppet master all the time to make changes to your code as root.