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步骤 20/29：运行 yum install -y docker-engine-18.09.8.ol-1.0.4.el7 ---> 在 9aa3b53a6171 中运行加载的插件：ovl https://artifactory.xxx.com/io-ol7- addons-yum-local/repodata/repomd.xml：[Errno 14] curl#60 - “无法识别对等证书颁发者。” 尝试其他镜子。

配置的存储库之一失败（io-ol7-addons-yum-local），并且 yum 没有足够的缓存数据来继续。在这一点上，yum 能做的唯一安全的事情就是失败。有几种方法可以“解决”这个问题：

 1. Contact the upstream for the repository and get them to fix the problem.

 2. Reconfigure the baseurl/etc. for the repository, to point to a working
    upstream. This is most often useful if you are using a newer
    distribution release than is supported by the repository (and the
    packages for the previous distribution release still work).

 3. Run the command with the repository temporarily disabled
        yum --disablerepo=io-ol7-addons-yum-local ...

 4. Disable the repository permanently, so yum won't use it by default. Yum
    will then just ignore the repository until you permanently enable it
    again or use --enablerepo for temporary usage:

        yum-config-manager --disable io-ol7-addons-yum-local
    or
        subscription-manager repos --disable=io-ol7-addons-yum-local

 5. Configure the failing repository to be skipped, if it is unavailable.
    Note that yum will try to contact the repo. when it runs most commands,
    so will have to try and fail each time (and thus. yum will be be much
    slower). If it is a very temporary problem though, this is often a nice
    compromise:

        yum-config-manager --save --setopt=io-ol7-addons-yum-local.skip_if_unavailable=true

失败：来自 io-ol7-addons-yum-local 的 repodata/repomd.xml：[Errno 256] 没有更多镜像可以尝试。 https://artifactory.xxx.com/io-ol7-addons-yum-local/repodata/repomd.xml：[Errno 14] curl#60 - “无法识别对等的证书颁发者。”

命令 '/bin/sh -c yum install -y docker-engine-18.09.8.ol-1.0.4.el7' 返回一个非零代码：1

在 linux 中工作的人有时会遇到这个问题，并通过下载 repo 配置并将其保存在路径 /etc/yum.repos.d/ 中来解决它。但是如何在不使用 YUM 的 Mac 中解决这个问题呢？

PS 有一个代理服务器，我已经在 docker 首选项代理设置中正确添加了代理设置。

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