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CentOS7.5 最小構成でyum実行時にCould not resolve host: mirrorlist.centos.orgエラー

CentOS7.5が出たので色々とコマンドを叩いて遊んでいます。そこで、インストール直後にyumを実行したら以下のエラーが出力されました。


ネットワークの設定をしているので、確認をしたところ、DNSの設定が入っていないことが原因でした。確かに、普段は、めんどうなので、VMware Playerで作ったサーバーはDNSの設定をせずに、DNSは自動取得になっていたので、確かにという感じです。

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#yum list
読み込んだプラグイン:fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; 不明なエラー"


One of the configured repositories failed (不明),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:

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=<repoid> ...

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 <repoid>
or
subscription-manager repos --disable=<repoid>

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=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: base/7/x86_64
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ということで、ここでDNSの設定をすると上記エラーが出力されなくなります。