Manage sysctl variable values. All changes are immediately applied, as well as configured to become persistent. Tested on Red Hat Enterprise Linux 6.
sysctl: Definition to manage sysctl variables by setting a value.
For persistence to work, your Operating System needs to support looking for
sysctl configuration inside /etc/sysctl.d/. When using this module, the
existing content of this directory will be purged, so be careful if you
have already put content there.
Beware also 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 can also force a value to ensure => absent, which will always work.
For the few original settings in the main /etc/sysct.conf file, the value is
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 :
sysctl { 'vm.swappiness': ensure => absent }