diskimage-builder/diskimage_builder/elements/dhcp-all-interfaces
Harald Jensås e7c52139aa dhcp-all-interfaces: opt let NetworkManager doit.
NetworkManager is quite capable to do automatic
interface configuration. NetworkManager will by default
try to auto-configure any interface with no configuration.
It will use DHCP for IPv4 and Router Advertisements to
decide how to initialize IPv6.

It will most likely do it just as good, or better than the
dhcp-all-interfaces.sh script.

Since dhcp-all-interfaces clean out all ifcfg files in
60-remove-cloud-image-interfaces it means NetworkManager will
by default attempt auto configuration for all interfaces.

This change add's and environment variable:
  DIB_DHCP_NETWORK_MANAGER_AUTO (default: false)

When DIB_DHCP_NETWORK_MANAGER_AUTO is set to `true` only the
NetworkManager config will be written. The dhcp-all-interfaces
service will not be installed. Hence dhcp-all-interfaces will
not write any config files, allowing NetworkManager to just do
it's thing.

Change-Id: Id6f8d6aaaf52a78175bb6c065ec88274c364834e
2022-01-24 01:45:49 +01:00
..
install.d dhcp-all-interfaces: opt let NetworkManager doit. 2022-01-24 01:45:49 +01:00
element-deps Move elements & lib relative to diskimage_builder package 2016-11-01 17:27:41 -07:00
package-installs.yaml Add IPv6 support in dhcp-all-interfaces 2019-11-13 09:31:01 +01:00
pkg-map Install ndisc6 package in element script 2019-12-03 14:57:33 +01:00
README.rst dhcp-all-interfaces: opt let NetworkManager doit. 2022-01-24 01:45:49 +01:00

===================
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).

Environment Variables
---------------------

DIB_DHCP_TIMEOUT
  :Required: No
  :Default: 30
  :Description: Amount of time in seconds that the systemd service(or dhclient)
   will wait to get an address. Should be increased in networks such as
   Infiniband.
  :Example: DIB_DHCP_TIMEOUT=300

DIB_DHCP_NETWORK_MANAGER_AUTO
  :Required: No
  :Default: false
  :Description: When NetworkManager is detected, and this is set to true the
   dhcp-all-interfaces service will not be installed. Only the NetworkManager
   configuration will be added. NetworkManager is quite capable to do automatic
   interface configuration. NetworkManager will by default try to
   auto-configure any interface with no configuration, it will use DHCP for
   IPv4 and Router Advertisements to decide how to initialize IPv6.
  :Example: DIB_DHCP_NETWORK_MANAGER_AUTO=true