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Can multiple UCP clusters share one DTR?

Currently, a DTR instance can only be associated with one UCP cluster (one-to-one mapping). Multiple UCP clusters can't share a single DTR instance.

This configuration constraint my change in the future. In the meantime, it is possible to pull images from a DTR instance that's associated with one UCP cluster using a worker node in another cluster, however DTR/UCP integration features such as Docker Content Trust are only available to the UCP cluster associated with the DTR instance.