问拉去容器镜像失败 authentication required 是咋回事。。。？

Failed to pull image "ccr.ccs.tencentyun.com/drawtogether/api:20180502_151625": rpc error: code = 2 desc = Error response from daemon: {"message":"Get https://ccr.ccs.tencentyun.com/v2/drawtogether/api/manifests/20180502_151625: unauthorized: authentication required"}查看详情