From 47965c02625b9721ef4303db9b79069d086c506d Mon Sep 17 00:00:00 2001 From: "Dustin C. Hatch" Date: Wed, 18 Jul 2018 20:27:05 -0500 Subject: [PATCH] roles/dhcpcd: Disable device management module Today I realized that `dhcpcd` has been logging several hundred thousand of these messages every second: libudev: received NULL device This was causing both `dhcpcd` and `systemd-journald` to consume 100% CPU. I am not entirely sure what a "device management" module is in the context of `dhcpcd`, but it does not seem to be required. Setting the `nodev` option in `dhcpcd.conf` suppresses the messages, and seems to have no effect on the operation of the daemon. --- roles/dhcpcd/templates/dhcpcd.conf.j2 | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/roles/dhcpcd/templates/dhcpcd.conf.j2 b/roles/dhcpcd/templates/dhcpcd.conf.j2 index ee26d45..c31497b 100644 --- a/roles/dhcpcd/templates/dhcpcd.conf.j2 +++ b/roles/dhcpcd/templates/dhcpcd.conf.j2 @@ -1,5 +1,10 @@ # A sample configuration for dhcpcd. # See dhcpcd.conf(5) for details. +{% if dhcpcd_nodev %} + +# Disable device management to avoid "libudev: received NULL device" log spam +nodev +{% endif %} # Allow users of this group to interact with dhcpcd via the control socket. {% if dhcpcd_controlgroup is defined %}