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These docs have AuthzPlugin with a lower case 'z'. What the plugin api is actually looking for is AuthZPlugin with an upper case 'Z'. See https://github.com/docker/docker/blob/46e3a249a1971f8697ca338c9b02e27d36ddab12/pkg/authorization/api.go#L5-L8 Signed-off-by: Everett Toews <everett.toews@rackspace.com>