diskimage-builder/elements/dhcp-all-interfaces/README.md
Dan Prince 7511faa2b1 Implement dhcp-all-interfaces for systemd.
Includes:

 * Enhancements to the generate-interfaces-file.sh script
 so that it generates ifcfg network-scripts for
 distros like Fedora/RHEL.

 * Includes a new dhcp-all-interfaces.service systemd
 script which ensures network interfaces get generated
 before the network service starts on Fedora.

 * Add a new disable_interface function to
 generate-interfaces-file.sh which (on Fedora)
 will delete the ifcfg config for an interface which
 isn't plugged in.
 This is important because ifcfg-eth0 exists by default
 and we want to remove it if the NIC isn't connected.
 Previous behaviour on Ubuntu is unchanged and the
 generate-interfaces-file.sh just logs it as skipped.

 * General doc updates...

I tested this on a multi-nic machine w/ Fedora where the first NIC
exists but was not connected.

Change-Id: Ia99e312539da43caefd72aa60398d43dac5dcc8f
Closes-Bug: 1239880
2014-01-10 10:14:07 -05:00

564 B

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 (except lo) that are visible on the first boot.

The script /usr/local/sbin/generate-interfaces-file.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.