Fleet agent fails to start with error secret fleet-agent not found

Article Number: 000021723

Environment

Rancher  2.8, 2.9

Situation

After Rancher upgrade, the fleet agent fails to start with the following error messages:

leaderelection.go:248] attempting to acquire leader lease cattle-fleet-system/fleet-agent-lock...
leaderelection.go:258] successfully acquired lease cattle-fleet-system/fleet-agent-lock
time="2024-03-21T16:02:37Z" level=warning msg="Cannot find fleet-agent secret, running registration"
panic: assignment to entry in nil map
(*Command).execute\n\t/home/runner/go/pkg/mod/github.com/spf13/cobra@v1.8.1/command.go:985\ngithub.com/spf13/cobra.
(*Command).Execute\n\t/home/runner/go/pkg/mod/github.com/spf13/cobra@v1.8.1/command.go:1041\ngithub.com/spf13/cobra.

Resolution

In the Rancher UI:

1. Click ☰ > Continuous Delivery.

2. Select your namespace at the top of the menu, noting the following:

3. By default, fleet-default is selected which includes all downstream clusters that are registered through Rancher.

4. You may switch to fleet-local, which only contains the local cluster, or you may create your own workspace to which you may assign and move clusters.
5. Click on Clusters on the left navigation bar and  Force Update