How to upgrade an RKE2 downstream cluster using curl

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Environment

SUSE Rancher 2.7.x, RKE2 downstream cluster

Situation

It is possible that the version of Kubernetes that you are upgrading to is not listed in Rancher. Currently, this is the case for the deprecated version as per this bug [1],

Resolution

The curl command below can help initiate the upgrade from the command line.

The format of the curl:

curl -v -u "$token-bear" \
-X PUT \
-H 'Accept: application/json' \
-H 'Content-Type: application/json' \
-d '{"rke2Config": {"kubernetesVersion": "v1.24.15+rke2r1"},"name": "$downstream-name"}' \
'$Rancher-URL-With-ClusterID'

Example:

curl -v -u "$token-bear" \
-X PUT \
-H 'Accept: application/json' \
-H 'Content-Type: application/json' \
-d '{"rke2Config": {"kubernetesVersion": "v1.24.15+rke2r1"},"name": "test-rancher"}' \
'https://pitshou.rancher.cloud/v3/clusters/c-m-74phsk89'

Additional Information

References:
[1] https://github.com/rancher/dashboard/issues/9530

Disclaimer

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