diskimage-builder/diskimage_builder/elements/simple-init/post-install.d/80-simple-init
Ian Wienand aee4fc0d35 simple-init: add configurable RA timeout with network-manager
This is a follow-on to I475a253091cbaf63687b91c748c31a6753bb0f57 as we
are still seeing issues on some clouds with unconfigured networking.

We increase the timeout, but also make it configurable so we can
fiddle it without a dib release in the gate.

To follow-on from the experimentation done by clarkb, I can confirm by
emperical testing on a Centos 7 image (from today, today being this
change's date) that setting

 net.ipv6.conf.all.autoconf=0

by itself is "fatal" and the interfaces do not come up; i.e. nm does
not by default seem to re-enable ipv6 for the interface.  However,
explicitly adding:

 IPV6INIT=yes
 IPV6_AUTOCONF=yes

to the interface file *does* seem to make it work, even if
"all.autoconf=0" is set (then again, there's also bugs about the
effect of this [1]).  However, no extant distribution (I can currently
find) does anything like this by default.

If this continues, this may be an option.  Another might be to avoid
the use of the nm-settings-ifcfg-rh profiles and move directly to nm
ini files with glean.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=11655

Change-Id: I869ebffc8cde3bbff573f6583fd9dd02a5598590
2019-08-20 17:07:17 +10:00

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#!/bin/bash
if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
set -x
fi
set -eu
set -o pipefail
case "$DIB_INIT_SYSTEM" in
upstart)
# nothing to do
exit 0
;;
systemd)
if [[ ${DISTRO_NAME} =~ (centos|rhel7|fedora) ]]; then
if [[ ${DIB_SIMPLE_INIT_NETWORKMANAGER} != 1 ]]; then
# NOTE(pabelanger): Glean requires network.service for
# these platforms when not using networkmanager
systemctl enable network.service
fi
elif [[ ${DISTRO_NAME} =~ (opensuse) ]]; then
# on suse, this is named wicked.service, but it's the same
# as network.service.
systemctl enable wicked.service
fi
;;
openrc)
# let dib-init-system's postinstall handle enabling init scripts
exit 0
;;
sysv)
# nothing to do
exit 0
;;
*)
echo "Unsupported init system $DIB_INIT_SYSTEM"
exit 1
;;
esac
if [[ ${DIB_SIMPLE_INIT_NETWORKMANAGER} != 0 ]]; then
# If we are using NetworkManager then we have to avoid having the kernel
# configure ipv6 addresses on an interface (via router advertisements)
# until NetworkManager starts. If the interface is configured by the
# kernel before NetworkManager then NetworkManager will ignore the
# interface and not configure ipv4 on it. It does this because it assumes
# some other entity is in control of the interface.
# Debian has a many year old long bug report detailing this behavior with
# the most interesting comment being at the end:
# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=755202#331
DIB_SIMPLE_INIT_NETWORKMANAGER_IPV6_DELAY=${DIB_SIMPLE_INIT_NETWORKMANAGER_IPV6_DELAY:-30}
echo "net.ipv6.conf.default.router_solicitation_delay=${DIB_SIMPLE_INIT_NETWORKMANAGER_IPV6_DELAY}" >> /etc/sysctl.conf
fi