这些存储库是

要么通过更新RPM软件包（例如 centos-release 或通过您设置/运行的自动脚本（可以吗？）。

Those repositories are created by someone, the OS doesn't recreate them.
Either they are restored by an update of a RPM package such as centos-release or by an automatic script you setup/run (ansible?).

我不知道删除存储库的自动方法；我看到了几种解决方案：

I'm not aware of an automatic method to delete a repo; I see a couple of solutions:

1. 从中排除 centos-release 通过将
   
   exclude = centos-release
   
   添加到 / etc / yum中来进行升级。 conf （用空格分隔的列表），但这可能会破坏某些更新；

1. Exclude centos-release from the upgradable packages, by adding
   exclude=centos-release
   to /etc/yum.conf (space separated list), but this could break some updates;

使用以下命令禁用它们：

Disable them with:

# yum-config-manager --disable base,updates,extras,centosplus,epel,whatever

（可以很容易地编写脚本并将其放在cron或您的ansible剧本中）

(this can be easily scripted and put in a cron or in your ansible playbook)

编写一个小脚本并将其放在 /etc/cron.hourly / 中，例如 /etc/cron.hourly/wipe_repos ，其中包含：

Write a small script and place it in /etc/cron.hourly/, e.g. /etc/cron.hourly/wipe_repos, containing:

#!/usr/bin/env bash
rm -f /etc/yum.repos.d/CentOS-Base.repo 

，或者更好：

#!/usr/bin/env bash
yum-config-manager --disable base,updates,extras,centosplus,epel,whatever

我建议使用解决方案2，因为回购文件不会被更新覆盖，但是新版本将旧版本放在 .rpmnew $ c $中c>文件。

I would suggest to use solution 2, since the repo files aren't overwritten by updates, but the new versions are placed along the old in .rpmnew files.

这由％config（noreplace）标志在 centos-release ，应用于 /etc/yum.repos.d / 中的所有文件。
您可以通过下载.src.rpm并打开 centos-release.spec 文件来进行检查。

This is guaranteed by the flag %config(noreplace) in the source rpm of centos-release, applied to all files in /etc/yum.repos.d/. You can check this by downloading the .src.rpm and opening the centos-release.spec file.

$ mkdir test && cd test
$ yumdownloader --source centos-release
$ rpm2cpio centos-release*.rpm | cpio -idmv
$ cat centos-release.spec

（或在线搜索包并下载src.rpm）

(or search for the package online and download the src.rpm)

然后向下滚动到％files 部分，您会注意到：

Then scroll down to section %files and you'll notice:

%config(noreplace) /etc/yum.repos.d/*

％config（noreplace）表示所有这些文件都不会被更新中的新文件替换，但新rpm中的文件将以扩展名 .rpmnew ，因此您将拥有：

%config(noreplace) means that all those files are not replaced with new files from an update, but the files from the new rpm are saved with the extension .rpmnew, so you'll have:

$ ls /etc/yum.repos.d/
CentOS-Base.repo          <-- here you set them as disabled
CentOS-Base.repo.rpmnew   <-- this comes from the update, but yum will ignore it

有关参考，请参见 http://people.ds.cam.ac.uk/jw35/docs/rpm_conf ig.html 或 https://serverfault.com/a/48819/ 。