centos cannot resolve host domain name

Problem restoration:

Resolving host cdn.openbsd.org (cdn.openbsd.org)... Failure: Domain name resolution temporarily failed.
wget: Unable to resolve host address "cdn.openbsd.org"

Cause:

The dns server is not configured.

(Recommended tutorial: centos usage tutorial)

Solution:

1. Enter /etc/resolv.conf

2. Modify or add content:

nameserver 8.8.8.8

Try again:

正在解析主机 cdn.openbsd.org (cdn.openbsd.org)... 151.101.2.217, 151.101.66.217, 151.101.130.217, ...
正在连接 cdn.openbsd.org (cdn.openbsd.org)|151.101.2.217|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：1597697 (1.5M) [application/octet-stream]
正在保存至: “openssh-8.0p1.tar.gz”
100%[========================================================================================================================>] 1,597,697 12.2KB/s 用时 2m 18s

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