Add support to set federal cluster

[LinuxSuRen]

KubeSphere support the federal cluster. It can set a Kubernetes cluster to be a member or host role. So, the first feature that I want to have is making a cluster to be a member or host.

Second, support to add a cluster to be a member of the host cluster. It can be a direct connection or agent mode.

See also the official document here.

[LinuxSuRen]

/help

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[LinuxSuRen]

Steps for adding a member cluster:

• Create or have a cluster as host role
• Get jwtSecret from the host cluster via kubectl -n kubesphere-system get cm kubesphere-config -o yaml | grep -v "apiVersion" | grep jwtSecret
• Setup the member cluster via ks com enable -e
  • spec.multicluster.clusterRole as member
  • spec.authentication.jwtSecret as the host jwtSecret value
• Check the status of member cluter via ks com log installer
• Add a cluster resource on the host cluster