rancherOS/docs/os/configuration/sysctl/index.md

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title: sysctl Settings in RancherOS

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sysctl Settings

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The rancher.sysctl cloud-config key can be used to control sysctl parameters. This works in a manner similar to /etc/sysctl.conf for other Linux distros.

#cloud-config
rancher:
  sysctl:
    net.ipv4.conf.default.rp_filter: 1

You can either add these settings to your cloud-init.yml, or use sudo ros config merge -i somefile.yml to merge settings into your existing system.