问题现象如下：
[root@ci1 ~]# docker image pull wzkres/centos-ci-gcc:centos-7-cross-arm64
centos-7-cross-arm64: Pulling from wzkres/centos-ci-gcc
2d473b07cdd5: Already exists
9d26d6802cad: Pull complete
90f6d29b7c1a: Pull complete
7bfff1b24796: Pull complete
80b3d4546432: Pull complete
c3a37398e8b3: Pull complete
3ba42b3a770d: Pull complete
85b3405c69c4: Downloading
2ad9c2d42a3d: Waiting
5f1b06925eb4: Waiting
4f4fb700ef54: Waiting
57c257cf6173: Waiting
787f48d693d2: Waiting
9f1677804e77: Waiting
c13fd6dc43b4: Waiting
80bd40938514: Waiting
56ba96a89fa8: Waiting
unauthorized: authentication required
在从hub.docker.com拉取公开镜像时，频繁出现标题中提到的错误而失败，出现时间随机，且出现频率非常高，导致稍大些的镜像几乎无法顺利完成下载。一开始以为是网络问题，各种更换“科学”，使用镜像代理均没什么效果，看提示的是“authentication”，还以为是docker hub登录信息的问题，于是也试过docker login -u xxxx，无果…
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