diskimage-builder/elements/dhcp-all-interfaces
Ben Nemec 2747613ca2 Shorten DHCP timeout in dhcp-all-interfaces
We are currently wasting about 10 minutes per deploy waiting for
DHCP on interfaces that will never get it.  By default, the timeout
seems to be 5 minutes (the 10 minutes is because we boot both the
IPA ramdisk and the deployed image, and each waits for 5 minutes),
which is excessively long to get a DHCP response.  This change
shortens the time to 30 seconds.  If an interface hasn't gotten a
response in 30 seconds, chances are it's not going to.  A 30
second wait should reduce our wasted time to 1 minute, which is
more reasonable.

This is being done in the systemd unit file because the -timeout
option to dhclient doesn't seem to override what is configured in
dhclient.conf, and doing it in the systemd file means that this
change will be limited to only the interfaces configured by
dhcp-all-interfaces.

Change-Id: Ia8610e3def39c937eb0c861fdc9bc571ec39f9f4
Closes-Bug: 1626673
2016-09-22 17:01:06 -05:00
..
install.d Shorten DHCP timeout in dhcp-all-interfaces 2016-09-22 17:01:06 -05:00
element-deps dhcp-all-interfaces depends on dib-init-system 2016-04-22 09:23:11 +10:00
package-installs.yaml Use generic "dhcp-client" name 2016-04-22 11:31:54 +10:00
pkg-map Fix OpenSUSE support 2016-05-03 22:23:51 -07:00
README.rst Add Gentoo to the dhcp-all-interfaces element 2016-04-21 16:40:06 -05:00

===================
dhcp-all-interfaces
===================
Autodetect network interfaces during boot and configure them for DHCP

The rationale for this is that we are likely to require multiple
network interfaces for use cases such as baremetal and there is no way
to know ahead of time which one is which, so we will simply run a
DHCP client on all interfaces with real MAC addresses (except lo) that
are visible on the first boot.

On non-Gentoo based distributions the script
/usr/local/sbin/dhcp-all-interfaces.sh will be called early in each
boot and will scan available network interfaces and ensure they are
configured properly before networking services are started.

On Gentoo based distributions we will install the dhcpcd package and
ensure the service starts at boot.  This service automatically sets
up all interfaces found via dhcp and/or dhcpv6 (or SLAAC).