We are introducing a new subcommand for managing your clusters. Configuring your CLI to talk to your cluster is a single command now `dcos cluster setup`. Moreover, the CLI can now be aware of multiple clusters with cluster specific configuration managed by the CLI.
Subcommands will be installed for the current "attached" cluster only. To install a subcommand for all your configured clusters, use `--global`.
Note that `DCOS_CONFIG` environment variable will not take effect in
"cluster" mode since we are now managing different clusters in the CLI.
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