Open Stack

Greetings,

In the last month, there’s been no update on what’s been happening in the
containers effort for TripleO so I thought I’d drop an email to… well… provide
updates.

The work in the DFG has been broken down into more granular steps that are
easier to account for. However, I’d like to focus a bit more on the architecture
side of things first.

There have been some major changes in how containers are deployed within TripleO
and how services are containerized. I’ll try to describe those below but bear in
mind that some details may change a little bit and that this is still a work in
progress.

* The new architecture aims to support a hybrid deployment where it’s possible
  to run some services on baremetal and others on containers. This has been done
  to ease the upgrade process from baremetal nodes to a containerize node and it
  doesn’t change the goal of having all services containerized. More details
  about this new architecture can be found here[0]. Please, check out the README
  file.
  
* There’s no heat agent container anymore. Instead, we’re installing puppet in
  the base image for every service and then run puppet from the service
  container. A bit of more details about this change can be found in this blog
  post[0] (Thanks Dan)
  
* The old copy-json file that used to create the config.json for the kolla image
  was replaced with a heat-hook. More about this on this patch.[2]
  
* Several patches for containerizing services have been proposed. TBH, we’ve not
  done a great job at using a single topic BUT if you open the patch[0], you’ll
  see a list of patches depending on it that propose the containerization of
  several projects.
  
* There’s a non-voting CI job that currently only runs on patches that modify
  files related to the containers work. You can read more about this on this
  patch[3]. The goal is to make this job voting as soon as Pike starts.
  
* Perhaps more RDO specific but there’s also been great progress in the building
  pipeline for containers. We’re using kolla images as our base container images
  and the image build process is being integrated with the TripleO CI pipeline.
  This means that new images will be created whenever there’s a promotion in
  TripleO. We’d like to take this one step further for Pike and be able to build
  images on every patch merged in the various projects, just like we’d do with
  RPM packages. I wanted to mention this because I love the fact that this helps
  us testing kolla images thoroughly and also give back to the community in some
  way. More on this can be found here[4]
  
* Support for a containerized deployment has been added to tripleo-quickstart
  and it’s being used for the CI job.
  
* The containers squad will start the work of documenting the current
  architecture as soon as possible. As mentioned in the points above, there have
  been several changes to the architecture that made starting the documentation
  process not worthwhile. We can start documenting things now that we feel more
  comfortable with the current version of the framework.
  
* We’re starting to work on a strategy for upgrades for baremetal nodes to
  containerized nodes. Again, this work was waiting for the architecture to be
  polished out a bit more and the composable upgrades work to mature. Now it
  seems like a good time to kick this off.

Eventually (and likely soon) this will impact other squads and there will be
need of a joint work towards finalizing the containerization process. More
details will be provided as part of the documentation and in future emails.

There are still many things to do, though. There are services that still need to
be containerized, there are more CI jobs to be added and all the services that
have been containerized so far must also be tested in the overcloud. That being
said, I’m personally happy with the progress made so far and I hope you are as
well and that this email is useful to you.

Rock on,
Flavio

[0] https://review.openstack.org/#/c/416421/
[1] https://dprince.github.io/docker-puppet.html
[2] https://review.openstack.org/#/c/416420/
[3] https://review.openstack.org/#/c/423519/
[4] https://etherpad.openstack.org/p/rdo-kolla-build

-- 
@flaper87
Flavio Percoco
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