Andy Shinn asked:
I’m looking for a way to set CoreOS
sysctl settings during its
The CoreOS version of
cloud-init only allows for a handful of configuration directives and is not the same as the regular
cloud-init. For example, there is no
runcmd section (see http://coreos.com/docs/cluster-management/setup/cloudinit-cloud-config/).
systemd provides a way to manage
sysctl settings though files (http://www.freedesktop.org/software/systemd/man/sysctl.d.html). I am using the CoreOS
write_files section to create a file at
/etc/sysctl.d/50-nf_conntrack.conf. But it won’t be picked up because the CoreOS cloud configuration happens after the
sysctl.d configuration has already taken place.
Perhaps I could somehow use another
systemd unit file to restart the
sysctl.d unit? How could this be accomplished?
You can simply call
sysctl on the file yourself to make the settings take effect immediately, and the configuration file will be used for later reboots (if your instance is persistent).
I’d use a run command for this.
runcmd: - sysctl -p /etc/sysctl.d/50-nf_conntrack.conf
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