Team and repository tags
[![Team and repository tags](http://governance.openstack.org/badges/tripleo-image-elements.svg)](http://governance.openstack.org/reference/tags/index.html)
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Image building rules for OpenStack images
These elements are used to build disk images for deploying OpenStack via Heat.
They are built as part of the TripleO (https://wiki.openstack.org/wiki/TripleO)
Checkout this source tree and also the diskimage builder, export an
ELEMENTS\_PATH to add elements from this tree, and build any disk images you
pip install dib-utils pyyaml
git clone https://git.openstack.org/openstack/diskimage-builder.git
git clone https://git.openstack.org/openstack/tripleo-image-elements.git
diskimage-builder/bin/disk-image-create -u base vm bootstrap local-config stackuser heat-cfntools -a i386 -o bootstrap
Common element combinations
Always include heat-cfntools in images that you intend to boot via heat : if
that is not done, then the user ssh keys are not reliably pulled down from the
metadata server due to interactions with cloud-init.
OpenStack images are intended to be deployed and maintained using Nova + Heat.
As such they should strive to be stateless, maintained entirely via automation.
In a running OpenStack there are several categories of config.
- per user - e.g. ssh key registration with nova: we repeat this sort
of config every time we add a user.
- local node - e.g. nova.conf or ovs-vsctl add-br br-ex : settings that
apply individually to machines
- inter-node - e.g. credentials on rabbitmq for a given nova compute node
- application state - e.g. 'neutron net-create ...' : settings that
apply to the whole cluster not on a per-user / per-tenant basis
We have five places we can do configuration in TripleO:
- image build time
- in-instance heat-driven (ORC scripts)
- from outside via APIs
- orchestrated by Heat
Our current heuristic for deciding where to do any particular configuration
- per user config should be done from the outside via APIs, even for
users like 'admin' that we know we'll have. Note that service accounts
are different - they are a form of inter-node configuration.
- local node configuration should be done via ORC driven by Heat and/or
configuration management system metadata.
- inter-node configuration should be done by working through Heat. For
instance, creating a rabbit account for a nova compute node is something
that Heat should arrange, though the act of creating is probably done by a
script on the rabbit server - triggered by Heat - and applying the config is
done on the compute node by the local node script - again triggered by Heat.
- application state changes should be done from outside via APIs
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