Upgrade CDK
Install latest/stable of Upgrade CDK
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Install using the command line
sudo snap install upgrade-cdkDon't have snapd? Get set up for snaps.
Details for Upgrade CDK
Package name
- upgrade-cdk
License
- Apache-2.0
Last updated
- 18 June 2026 - latest/stable
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Automated Charmed Distribution of Kubernetes (CDK) upgrade tool
upgrade-cdk automates the CDK (Charmed Distribution of Kubernetes) upgrade workflow using the Jubilant library.
Features:
- Charm refresh – refresh charms from a CSV manifest in the correct order
- Config management – validate and apply application configuration
- State monitoring – wait for units to reach active/idle after each step
- ETCD backup – snapshot the etcd cluster before any upgrade begins
- Sequential unit upgrades – upgrade control-plane and worker units one at a time with interactive confirmation
- Blue-green worker migration – replace workers one-by-one with new machines using full cordon + drain + remove lifecycle
Usage:
upgrade-cdk <controller>:<model> <channel>
upgrade-cdk <controller>:<model> <channel> [charms.csv]
upgrade-cdk <controller>:<model> <channel> --bluegreen
upgrade-cdk <controller>:<model> <channel> [charms.csv] --bluegreen --parallel 3
When no CSV file is given the bundled charms.csv is used.
Why classic confinement? upgrade-cdk requires unrestricted filesystem access to:
- Juju credentials at ~/.local/share/juju (written by the juju snap)
- Kubernetes config at ~/.kube/config or $KUBECONFIG
- SSH keys used for juju scp operations
- The juju snap binary at /snap/bin/juju
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The build and commit information is derived from build infrastructure records.
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