diskimage-builder/elements/simple-init
Gregory Haynes 00d9a9d396 Fix ssh key cleanup to run in chroot
Right now this removes the ssh keys on the build host. Obviously this is
not what we want.

Change-Id: Ib01d71ff9415a0ae04d963f6e380aab9ac2260ce
2016-04-06 17:11:59 +00:00
..
cleanup.d Fix ssh key cleanup to run in chroot 2016-04-06 17:11:59 +00:00
environment.d Simple-init should disable cloud-init 2015-05-11 16:55:02 +00:00
install.d Remove all interface configs for simple-init 2016-03-19 04:17:34 +00:00
element-deps Switch simple-init to pip-and-virtualenv element 2016-02-08 16:58:14 +11:00
package-installs.yaml Depend on ifupdown in simple-init 2016-02-20 08:19:21 -06:00
pkg-map Depend on ifupdown in simple-init 2016-02-20 08:19:21 -06:00
README.rst Add element to process config-drive network info 2015-04-14 13:39:18 -04:00
source-repository-simple-init Install glean from openstack source 2015-04-25 08:45:10 -04:00

===========
simple-init
===========
Basic network and system configuration that can't be done until boot

Unfortunately, as much as we'd like to bake it in to an image, we can't
know in advance how many network devices will be present, nor if DHCP is
present in the host cloud. Additionally, in environments where cloud-init
is not used, there are a couple of small things, like mounting config-drive
and pulling ssh keys from it, that need to be done at boot time.

Autodetect network interfaces during boot and configure them
------------------------------------------------------------

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.

The script `/usr/local/sbin/simple-init.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.

Processing startup information from config-drive
------------------------------------------------

On most systems, the DHCP approach desribed above is fine. But in some clouds,
such as Rackspace Public cloud, there is no DHCP.  Instead, there is static
network config via `config-drive`. `simple-init` will happily call
`glean` which will do nothing if static network information is
not there.

Finally, glean will handle ssh-keypair-injection from config
drive if cloud-init is not installed.