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Version information

  • 1.0.7 (latest)
  • 1.0.6
  • 1.0.5
  • 1.0.4
  • 1.0.3
  • 1.0.2
  • 1.0.1
  • 1.0.0
  • 0.3.2
  • 0.3.1
  • 0.3.0
  • 0.2.0
  • 0.1.1
  • 0.1.0
  • 0.0.3
  • 0.0.2
  • 0.0.1
released Jun 30th 2021
This version is compatible with:
  • Puppet Enterprise 3.x
  • Puppet >=2.7.20 <8.0.0
  • , , ,

Start using this module

  • r10k or Code Manager
  • Bolt
  • Manual installation
  • Direct download

Add this module to your Puppetfile:

mod 'thias-sysctl', '1.0.7'
Learn more about managing modules with a Puppetfile

Add this module to your Bolt project:

bolt module add thias-sysctl
Learn more about using this module with an existing project

Manually install this module globally with Puppet module tool:

puppet module install thias-sysctl --version 1.0.7

Direct download is not typically how you would use a Puppet module to manage your infrastructure, but you may want to download the module in order to inspect the code.

Tags: os, sysctl


thias/sysctl — version 1.0.7 Jun 30th 2021



Manage sysctl variable values. All changes are immediately applied, as well as configured to become persistent. Tested on Red Hat Enterprise Linux 6 and 7.

  • sysctl : Definition to manage sysctl variables by setting a value.
  • sysctl::base: Base class (included from the definition).

For persistence to work, your Operating System needs to support looking for sysctl configuration inside /etc/sysctl.d/.

You may optionally enable purging of the /etc/sysctl.d/ directory, so that all files which are not (or no longer) managed by this module will be removed.

Beware that for the purge to work, you need to either have at least one sysctl definition call left for the node, or include sysctl::base manually.

You may also force a value to ensure => absent, which will always work.

For the few original settings in the main /etc/sysctl.conf file, the value is also replaced so that running sysctl -p doesn't revert any change made by puppet.


Enable IP forwarding globally :

sysctl { 'net.ipv4.ip_forward': value => '1' }

Set a value for maximum number of connections per UNIX socket :

sysctl { 'net.core.somaxconn': value => '65536' }

Make sure we don't have any explicit value set for swappiness, typically because it was set at some point but no longer needs to be. The original value for existing nodes won't be reset until the next reboot :

sysctl { 'vm.swappiness': ensure => absent }

If the order in which the files get applied is important, you can set it by using a file name prefix, which could also be set globally from site.pp :

Sysctl { prefix => '60' }

To enable purging of settings, you can use hiera to set the sysctl::base $purge parameter :

# sysctl
sysctl::base::purge: true


It is also possible to manage all sysctl keys using hiera, through the $values parameter of the sysctl::base class. If sysctl values are spread across different hiera locations, it's also possible to merge all of them instead of having only the last one applied, by setting the $hiera_merge_values parameter to true.

    value: '1'
    value: '65536'
    ensure: absent

Original /etc/sysctl.d entries

When purging, puppet might want to remove files from /etc/sysctl.d/ which have not been created by puppet, but need to be present. It's possible to set the same values for the same keys using puppet, but if the file comes from an OS package which gets updated, it might re-appear when the package gets updated. To work around this issue, it's possible to simply manage an identical file with this module. Example :

package { 'libvirt': ensure => installed } ->
sysctl { 'libvirtd':
  suffix => '',
  source => "puppet:///modules/${module_name}/libvirtd.sysctl",