Outage in CAST
Degraded: CAST AI node provisioning issues on AKS with Kubernetes 1.36
Resolved Minor
June 16, 2026 - Started 1 day ago
- Lasted about 4 hours
Incident Report
CAST AI node provisioning fails on AKS clusters running Kubernetes 1.36.0 or above. This is caused by Azure removing support for Ubuntu 22.04 (the OS currently used by CAST AI for AKS worker nodes) on Kubernetes 1.36+.
Impact: Clusters upgraded to Kubernetes 1.36 on AKS will be unable to provision new nodes via CAST AI.
Workaround: Do not upgrade AKS control plane to Kubernetes 1.36 until further notice.
Next update: We are working on Ubuntu 24.04 support / temporary workaround and will provide an update once a fix is available.
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MONITORING
1 day ago - at 06/16/2026 02:08PM
We have identified a workaround which allows nodes to continue provisioning normally for the affected clusters. Node functionality is not impacted.
If you have already upgraded to 1.36 and are experiencing provisioning failures, please reach out to support and we will assist in applying the workaround. A permanent fix with Ubuntu 24.04 support is in progress. We will notify you once available.
IDENTIFIED
1 day ago - at 06/16/2026 11:14AM
CAST AI node provisioning fails on AKS clusters running Kubernetes 1.36.0 or above. This is caused by Azure removing support for Ubuntu 22.04 (the OS currently used by CAST AI for AKS worker nodes) on Kubernetes 1.36+.
Impact: Clusters upgraded to Kubernetes 1.36 on AKS will be unable to provision new nodes via CAST AI.
Workaround: Do not upgrade AKS control plane to Kubernetes 1.36 until further notice.
Next update: We are working on Ubuntu 24.04 support / temporary workaround and will provide an update once a fix is available.
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