Setting sysctl values

By default, TPA sets various sysctl values on target instances, and includes them in /etc/sysctl.conf so that they persist across reboots.

You can optionally specify your own values in sysctl_values :

cluster_vars:
  sysctl_values:
    kernel.core_pattern: core.%e.%p.%t
    vm.dirty_bytes: 4294967296
    vm.zone_reclaim_mode: 0

Any values you specify will take precedence over TPA’s default values for that variable (if any). The settings will first be added to sysctl.conf line-by-line, and finally loaded with sysctl -p .

Docker and lxd instances do not support setting sysctls, so TPA will skip this step altogether for those platforms.