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title: Release notes
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author: Stefan Reimer
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# KubeZero 1.22
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# Custom AMIs
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## Release notes
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### Custom AMIs
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Starting with 1.22, all KubeZero nodes will boot from custom pre-baked AMIs. These AMIs will be provided and shared by the Zero Down Time for all customers, all sources and build pipeline are freely [available](https://git.zero-downtime.net/ZeroDownTime/alpine-zdt-images).
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This eliminates *ALL* dependencies at boot time other than container registries. Gone are the days when Ubuntu, SuSE or Github decided to ruin your morning coffee.
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@ -11,25 +10,25 @@ This eliminates *ALL* dependencies at boot time other than container registries.
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KubeZero also migrates from Ubuntu 20.04 LTS to [Alpine v3.15](https://www.alpinelinux.org/releases/) as its base OS, which reduces the root file system size from 8GB to 2GB.
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Additionally all AMIs are encrypted, which is ensures encryption at rest even for every instance's root file system. This closes the last gaps in achieving *full encryption at rest* for every volume within a default KubeZero deployment.
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# DNS
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### DNS
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The [external-dns](https://github.com/kubernetes-sigs/external-dns) controller got integrated and is used to provide DNS based loadbalacing for the apiserver itself. This allows high available control planes on AWS as well as bare-metal in combination with various DNS providers.
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Further usage of this controller to automate any DNS related configurations, like Ingress etc. is planned for following releases.
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# crun - container runtime
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### crun - container runtime
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got migrated from runc to crun, which reduces the memory overhead *per pod* from 16M to 4M, details at [crun intro](https://www.redhat.com/sysadmin/introduction-crun)
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# Version upgrades
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### Version upgrades
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- Istio to 1.13.2
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- aws-termination-handler to 1.16
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- aws-iam-authenticator to 0.5.7
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# Misc
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### Misc
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- new metrics and dashboards for openEBS LVM CSI drivers
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- new node label `node.kubernetes.io/instance-type` for all nodes containing the EC2 instance type
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# Upgrade
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## Upgrade
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*Ensure your Kube context points to the correct cluster !!!*
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@ -54,5 +53,5 @@ Eg. by doubling `desired` for each worker ASG,
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once all new workers joined, drain old workers one by one,
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finally reset `desired` for each worker ASG which will terminate the old workers.
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# Known issues
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## Known issues
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