Hi puppeteers,
I’m starting from scratch with Puppet 2.7 and I’m trying to avoid some
pitfalls from the past using another configuration management tool. I
think most of the issues I had could be solved by Puppet and Hiera but
being new to the tool and the approach, Im seeking for advice.
I have a common use case with the configuration of sysctl settings I
believe will help me understand if Hiera is the right tool or approach to
the problem. Now the requirements are :
1) All nodes get a set of default settings
2) Based on facts such as function/application, settings are added
incrementally
3) A default setting might be overridden for a specific use.
The ‘old’ way I used to solve this was through templating and lots if/else
statements… but that’s exactly what Im trying to avoid as the knowledge
about the infrastructure gets spread everywhere.
When I found about the Puppet and Augeas combination I thought that was
the solution. I also wanted an ENC and using hiera sound great also.
So here’s the hiera config :
---
:hierarchy:
- %{fqdn}
- %{os}
- %{role}
- %{datacenter}
- common
:backends:
- yaml
:yaml:
:datadir: '/etc/puppet/hieradata'
The common sysctl are in common.yaml:
classes:
- sysctl
sysctl_settings:
net.ipv4.ip_forward:
value: 0
kernel.randomize_va_space:
value: 1
net.ipv4.conf.all.send_redirects:
value: 0
The more specific and possibly overriding parameters are in role-ap.yaml:
classes:
- sysctl
sysctl_settings:
vm.swapiness:
value: 0
net.ipv4.ip_forward:
value: 1
The sysctl wrapper module :
class sysctl {
create_resources( sysctl::config, hiera('sysctl_settings') )
}
define sysctl::config ($value) {
augeas { "sysctl_${name}":
context => "/files/etc/sysctl.conf",
lens => "sysctl.lns",
incl => "/etc/sysctl.conf",
changes => [ "set ${name} ${value}" ],
}
}
Now the issue is that only the settings found in role-ap.yaml are applied.
It looks like hiera stops at the first array matching in the hierarchy. Did
I got this all wrong?
The other issue with this approach is I can’t define a ‘’sysctl_${name}’
resource twice so overriding a parameter doesn’t work either. How can I
get the same result as with capitalization of a File resource for example?
Thanks to all,
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