Ian Wienand 1f499360fc yum-minimal: do not configure eth0 & eth1 for DHCP automatically

Add an environment variable to control the creation of eth0/1
interface enablement scripts.

With a tool such as glean, the presence of these scripts will indicate
the interface is configured and configuration-drive settings will not
be applied.  This means in a non-dhcp situation like on Rackspace,
network is broken.

On Fedora, where later systemd provides "predictable network interface
names" [1] eth0 & eth1 ironically aren't predictable so this just
confuses things.  You really need cloud-init or glean or something to
bring up your interfaces in a sane fashion.

This maintains the status-quo on centos-minimal, but disables creation
for fedora-minimal.

[1] http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/

Change-Id: I3f1ffeb6de3b1f952292a144efab9554f7f99a5f

2015-12-22 08:39:04 +11:00

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centos-minimal

Create a minimal image based on CentOS 7.

Use of this element will require 'yum' and 'yum-utils' to be installed on Ubuntu and Debian. Nothing additional is needed on Fedora or CentOS.

This element cannot be used with the base element, therefore must pass the -n flag to disk-image-create when using this element.

The DIB_OFFLINE or more specific DIB_YUMCHROOT_USE_CACHE variables can be set to prefer the use of a pre-cached root filesystem tarball.

By default, DIB_YUM_MINIMAL_CREATE_INTERFACES is set to enable the creation of /etc/sysconfig/network-scripts/ifcfg-eth[0|1] scripts to enable DHCP on the eth0 & eth1 interfaces. If you do not have these interfaces, or if you are using something else to setup the network such as cloud-init, glean or network-manager, you would want to set this to 0.

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centos-minimal

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