Attempting to configure an ISC BIND repository on Red Hat Linux 7.9

[Michał Kępień]

> Dnf is not available. Therefore using yum
> 
> Linux Red Hat 7.9 virtual machine on VMware, has internet connectivity
> 
> Set up local repository in /etc/yum.repos.d/download.copr.fedorainfracloud.org_results_isc_bind_epel-8-_.repo:

Is something (e.g. policy) forcing you to set this repository up
manually?  IMHO it would have been simpler with the "copr" yum plugin.
CentOS 7 allows installing it via "yum install yum-plugin-copr", though
RHEL 7 seems to not have heard of a "yum-plugin-copr" package, so you
have to prod it a bit (similarly for EPEL, which you are going to need
for libnghttp2 if you plan to use the stable "bind" repository, which
currently contains BIND 9.18):

    # yum install http://mirror.centos.org/centos/7/os/x86_64/Packages/yum-plugin-copr-1.1.31-54.el7_8.noarch.rpm
    # yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
    # yum copr enable isc/bind
    # yum install isc-bind

(I just tested these commands on a fresh RHEL 7 Docker image.)

> now receiving error: "https://download.copr.fedorainfracloud.org/results/isc/bind/epel-8-x86_64/repodata/repomd.xml: [Errno 14] HTTPS Error 503 - Service Unavailable" for each of the sites in isc: https:// download.copr.fedorainfracloud.org/results/isc/bind/epel-8-x86_64/    (i.e. repeats 10 x)
> 
> curl -k https://download.copr.fedorainfracloud.org/results/isc/bind/epel-8-x86_64/  shows web page content so the connection is good

And does:

    curl -v -k https://download.copr.fedorainfracloud.org/results/isc/bind/epel-7-x86_64/repodata/repomd.xml

output an XML file?  What IP is it trying to connect to?  Are you able
to verify that yum tries to reach the same IP when you try to install
packages?

> internet search indicates a possible issue with the target site (which I doubt)

It is certainly within the realm of possibility.  Copr is backed by a
CDN, so I can imagine a situation in which the specific host you are
connecting to from your vantage point is dysfunctional in some way while
others are working just fine.

-- 
Best regards,
Michał Kępień