The following is an example demonstration how to modify the port dedicated to a bucket. In the case of updating bucket properties with couchbase-cli you should provide other existing bucket properties as options, even though you might not be changing these other properties. This is because the command to update bucket properties may interpret missing options as meaning the option should be reset to a default/nothing. We recommend you review the current bucket properties and provide your new option and existing options that you want to maintain:

shell> couchbase-cli bucket-edit -c 192.168.0.1:8091 --bucket=test_bucket \
      --bucket-port=11222 --bucket-ramsize=400