This release is primarily focused on better support
for Autoscaling, Microsoft Azure support & better
default security. There are also a number of bug fixes
and configurability improvements!
In prior versions (v0.5), if you wanted to disable the pre-puller,
you would use:
```yaml
prePuller:
enabled: false
```
Now, to disable the pre-puller, you need to use:
```yaml
prePuller:
hook:
enabled: false
```
See the [pre-puller docs](http://zero-to-jupyterhub.readthedocs.io/en/latest/advanced.html#pre-pulling-images-for-faster-startup) for more info!
This release does not require any special steps to upgrade from v0.5. See the [upgrade documentation](https://zero-to-jupyterhub.readthedocs.io/en/latest/upgrading.html)
for general upgrading steps.
If you are running v0.4 of the chart, you should upgrade to v0.5 first
before upgrading to v0.6. You can find out what version you are using
by running `helm list`.
z2jh is more secure by default with 0.6. We now
block access to cloud security metadata endpoints by
default.
See the [security documentation](http://zero-to-jupyterhub.readthedocs.io/en/latest/security.html) for more details. It has seen a number of improvements, and we recommend
you read through it!
Some cloud providers support the [kubernetes node autoscaler](https://github.com/kubernetes/autoscaler/tree/master/cluster-autoscaler),
which can add / remove nodes depending on how much your
cluster is being used. In this release, we made a few
changes to let z2jh interact better with the autoscaler!
- Configure z2jh to ['pack' your users](http://zero-to-jupyterhub.readthedocs.io/en/latest/advanced.html#picking-a-scheduler-strategy)
onto nodes, rather than 'spread' them across nodes.
- A ['continuous' pre-puller](http://zero-to-jupyterhub.readthedocs.io/en/latest/advanced.html?highlight=prepull#pre-pulling-images-for-faster-startup)
that allows user images to
be pulled on new nodes easily, leading to faster startup
times for users on new nodes. ([link])
- Hub and Proxy pod will not be disrupted by autoscaler,
by using [PodDisruptionBudget](https://kubernetes.io/docs/tasks/run-application/configure-pdb/)s. The Hub & Proxy will also stick
together if possible, thus minimizing the number of nodes
that can not be downsized by the autoscaler.
There is more work to be done for good autoscaling support,
but this is a good start!
Azure's new managed Kubernetes service ([AKS](https://docs.microsoft.com/en-us/azure/aks/)) is much
better supported by this version!
- We have much better documentation on using z2jh with Azure!
- We rewrote our pre-puller so it works on Azure (previously it did not)
Azure AKS is still in preview mode, so be aware of that
before using it in any production workloads!
See the [setting up Kubernetes on Microsoft AKS](http://zero-to-jupyterhub.readthedocs.io/en/latest/create-k8s-cluster.html#setting-up-kubernetes-on-microsoft-azure-container-service-aks) section for more information.
We now have better documentation and bug fixes for configurability!
- `extraConfig` can be a dictionary instead of just a
string. This helps when you have to split your `config.yaml`
into multiple files for complex deployments
- How user storage works by default is [better documented](http://zero-to-jupyterhub.readthedocs.io/en/latest/user-storage.html)
- Reading config in `extraConfig` from `extraConfigMap` now actually works!
- You can configure the URL that users are directed to after they log in.
This allows [defaulting users to JupyterLab](http://zero-to-jupyterhub.readthedocs.io/en/latest/user-environment.html#use-jupyterlab-by-default)
- You can pre-pull multiple images now, for custom configuration that needs multiple images
- [Better instructions](http://zero-to-jupyterhub.readthedocs.io/en/latest/user-environment.html#pre-populating-user-s-home-directory-with-files)
on pre-populating your user's filesystem using [nbgitpuller](https://github.com/data-8/nbgitpuller)
_(excerpt from https://www.cricket.com.au/players/ellyse-perry/1aMxKNyEOUiJqhq7N5Tlwg)_
Arguably the best athlete in Australia, Ellyse Perry’s profile continues to rise
with the dual cricket and soccer international having played World Cups for both sports.
Perry became the youngest Australian ever to play senior international cricket when
she made her debut in the second ODI of the Rose Bowl Series in Darwin in July 2007
before her 17th birthday.
She went on to make her domestic debut in the 2007-08 Women’s National Cricket League
season, taking 2-29 from 10 overs in her first match.
Since her national debut, Perry has become a regular fixture for the Southern Stars,
playing in the 2009 ICC Women’s World Cup and the ICC Women’s World Twenty20 in the same year.
Leading Australia’s bowling attack, Perry played a crucial role in the ICC Women’s
World Twenty20 Final in the West Indies in 2010.
The match came down to the wire, with New Zealand requiring five runs off the last
ball to claim the title. Under immense pressure, Perry bowled the final ball of the
tournament, which New Zealand’s Sophie Devine struck straight off the bat.
The talented footballer stuck out her boot to deflect the ball to Lisa Sthalekar at
mid-on, securing the trophy for Australia. Perry’s figures of 3-18 in the final saw
her take home the Player of the Match award.
Perry featured prominently in Australia's three-peat of World T20 victories,
selected for the Team of the Tournament in 2012 and 2014.
She was named [ICC Female Cricketer of the Year](http://www.abc.net.au/news/2017-12-22/ellyse-perry-named-iccs-womens-cricketer-of-the-year/9280538) in 2017.
This release wouldn't have been possible without the wonderful contributors
to the [zero-to-jupyterhub](https://github.com/jupyterhub/zero-to-jupyterhub-k8s),
and [KubeSpawner](https://github.com/jupyterhub/kubespawner) repos.
We'd like to thank everyone who contributed in any form - Issues, commenting
on issues, PRs and reviews since the last Zero to JupyterHub release.
In alphabetical order,
- [Aaron Culich](https://github.com/aculich)
- [Anirudh Ramanathan](https://github.com/foxish)
- [Antoine Dao](https://github.com/twanito)
- [BerserkerTroll](https://github.com/BerserkerTroll)
- [Carol Willing](https://github.com/willingc)
- [Chris Holdgraf](https://github.com/choldgraf)
- [Christian Mesh](https://github.com/cam72cam)
- [Erik Sundell](https://github.com/consideRatio)
- [forbxy](https://github.com/forbxy)
- [Graham Dumpleton](https://github.com/GrahamDumpleton)
- [gweis](https://github.com/gweis)
- [Ian Allison](https://github.com/ianabc)
- [Jason Kuruzovich](https://github.com/jkuruzovich)
- [Jesse Kinkead](https://github.com/jkinkead)
- [madanam1](https://github.com/madanam1)
- [Matthew Rocklin](https://github.com/mrocklin)
- [Matthias Bussonnier](https://github.com/Carreau)
- [Min RK](https://github.com/minrk)
- [Ryan Lovett](https://github.com/ryanlovett)
- [Simon Li](https://github.com/manics)
- [Steve Buckingham](https://github.com/stevebuckingham)
- [Steven Normore](https://github.com/snormore)
- [Tim Head](https://github.com/betatim)
- [Yuvi Panda](https://github.com/yuvipanda)
- [ZachGlassman](https://github.com/ZachGlassman)