sysconfig fails to apply sysctl

[dashmage]

We have sysconfig related to nova-compute

$ juju config sysconfig sysctl { vm.swappiness: 10 }

when checking the nodes we don't see vm.swappiness applied:

root@node1:~# sysctl -a | grep vm.swap vm.swappiness = 60

Given nova-compute has its own sysctl and they are configured on the machine:

$ juju config nova-compute-kvm sysctl { net.ipv4.neigh.default.gc_thresh1 : 128, net.ipv4.neigh.default.gc_thresh2 : 28672, net.ipv4.neigh.default.gc_thresh3 : 32768, net.ipv6.neigh.default.gc_thresh1 : 128, net.ipv6.neigh.default.gc_thresh2 : 28672, net.ipv6.neigh.default.gc_thresh3 : 32768, net.nf_conntrack_max : 1000000, net.netfilter.nf_conntrack_buckets : 204800, net.netfilter.nf_conntrack_max : 1000000 }

we need to understand if sysconfig sysctl are wiped by

• a config change to nova-compute that applies its sysctl
• a reboot

---

Imported from Launchpad using lp2gh.

• date created: 2021-02-09T16:06:27Z

• owner: peppepetra

• assignee: mertkirpici

• the launchpad url

[dashmage]

(by zzehring) So after altering the sysctl for the sysconfig application [0], the file sysctl.d file was created and "sysctl -a | grep vm.swap" has been applied. From this, it looks like there's a possibility that the sysctl.d file is not written on initial deploy.

[0] juju config sysconfig sysctl="{ vm.swappiness: 10, vm.extfrag_threshold: 200, vm.watermark_scale_factor: 50 }"

[dashmage]

(by jfguedez) Added the charm to a fresh machine. I can confirm that the file wasn't created on charm deployment. The following file is missing on the new unit, but present on previous ones (with the expected content, matching the charm settings):

/etc/sysctl.d/90-charm-sysconfig.conf