How to Configure Credentials for GCR Proxy Repository

As documented in https://cloud.google.com/container-registry/docs/advanced-authentication, GCR offers a number of authentication methods, but to configure authentication for a GCR proxy repository in Nexus 3, the JSON Key File option should be used. 

To do this, via the Nexus 3 UI --> Repositories --> 'GCR PROXY REPO ID' --> HTTP --> Authentication, set:

  • Authentication Type: 
    Username
  • Username: 
    _json_key
  • Password: 
    contents of keyfile.json
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