diskimage-builder/diskimage_builder/elements/base/README.rst

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====
base
====
This is the base element.
Almost all users will want to include this in their disk image build,
as it includes a lot of useful functionality.
Make managing hosts entries optional Diskimage-builder currently writes cloud-init config file which adds a host entry mapping the hostname and FQDN to 127.0.0.1 into every image built. This is probably useful for some use cases but not for all, so we now allow customizing the manage_etc_hosts value via DIB_CLOUD_INIT_ETC_HOSTS variable and also not writing the config at all if that variable is explicitly set to an empty string (currently the default is 'localhost' but in the future the default will be empty string). Particular description of the problem this causes in TripleO follows: We get hosts files like this: ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 127.0.0.1 ov-rl5i5saoc6h-1-hj5tzsbrdv4c-controller-dy6nuyarqy5z.novalocal ov-rl5i5saoc6h-1-hj5tzsbrdv4c-controller-dy6nuyarqy5z # HEAT_HOSTS_START - Do not edit manually within this section! 192.0.2.17 ov-rl5i5saoc6h-0-wfzcsrqo34p6-controller-m3hy26lhxavl ov-rl5i5saoc6h-0-wfzcsrqo34p6-controller-m3hy26lhxavl.novalocal 192.0.2.15 ov-rl5i5saoc6h-1-hj5tzsbrdv4c-controller-dy6nuyarqy5z ov-rl5i5saoc6h-1-hj5tzsbrdv4c-controller-dy6nuyarqy5z.novalocal 192.0.2.16 ov-rl5i5saoc6h-2-a6v7saxnivm5-controller-7jboskte34r7 ov-rl5i5saoc6h-2-a6v7saxnivm5-controller-7jboskte34r7.novalocal # HEAT_HOSTS_END The duplicate hostname/FQDN entry for 127.0.0.1 and 192.0.2.15 confuses Corosync, which then fails to start a cluster when using hostnames in the config file instead of IPs. Change-Id: Ia8582883f737548e2911d3f36a1943e5b236281b Partial-Bug: #1447497
2015-04-24 11:32:36 +00:00
The `DIB_CLOUD_INIT_ETC_HOSTS` environment variable can be used to
customize cloud-init's management of `/etc/hosts`:
* If the variable is set to something, write that value as
cloud-init's manage_etc_hosts.
* If the variable is set to an empty string, don't create
manage_etc_hosts setting (cloud-init will use its default value).
* If the variable is not set, use "localhost" for now. Later, not
setting the variable will mean using cloud-init's default. (To
preserve diskimage-builder's current default behavior in the
future, set the variable to "localhost" explicitly.)
The 'DIB_AVOID_PACKAGES_UPDATE' environment variable can be used to
avoid updating all packages, useful when wanting to avoid release
update.
* 'DIB_AVOID_PACKAGES_UPDATE' default is '0', all packages will be updated.
* set 'DIB_AVOID_PACKAGES_UPDATE' to '1' to avoid updating all packages.
Notes:
* If you are getting warnings during the build about your locale
being missing, consider installing/generating the relevant locale.
This may be as simple as having language-pack-XX installed in the
pre-install stage