Centos 7 Mounting ISO Images to Configure Local Offline Yum Sources

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mkdir -pv /mnt/{iso,cdrom}

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mount -o loop /mnt/iso/CentOS-7-x86_64-DVD-2009.iso /mnt/cdrom
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df -Th  # Check if the mount was successful

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-rw-r--r--.  3 root root     14 Oct 30  2020 CentOS_BuildTag
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drwxr-xr-x.  3 root root   2048 Oct 27  2020 EFI
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-rw-rw-r--. 21 root root    227 Aug 30  2017 EULA
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-rw-rw-r--. 21 root root  18009 Dec 10  2015 GPL
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drwxr-xr-x.  3 root root   2048 Oct 27  2020 images
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drwxr-xr-x.  2 root root   2048 Nov  3  2020 isolinux
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drwxr-xr-x.  2 root root   2048 Oct 27  2020 LiveOS
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drwxr-xr-x.  2 root root 673792 Nov  4  2020 Packages
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drwxr-xr-x.  2 root root   4096 Nov  4  2020 repodata
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-rw-rw-r--. 21 root root   1690 Dec 10  2015 RPM-GPG-KEY-CentOS-7
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-rw-rw-r--. 21 root root   1690 Dec 10  2015 RPM-GPG-KEY-CentOS-Testing-7
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-r--r--r--.  1 root root   2883 Nov  4  2020 TRANS.TBL

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mkdir -pv /opt/repo_bak
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mv /etc/yum.repos.d/*.repo /opt/repo_bak/
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touch /etc/yum.repos.d/local.repo

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[local]
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name=local
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baseurl=file:///mnt/cdrom    # /mnt/cdrom is the directory where the ISO image is mounted
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gpgcheck=0
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enabled=1
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gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-CentOS-7

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Loaded plugins: fastestmirror, langpacks
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Determining fastest mirrors
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Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
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14: curl#6 - "Could not resolve host: mirrorlist.centos.org"
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 One of the configured repositories failed (Unknown),
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 and yum doesn't have enough cached data to continue. At this point the only
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 safe thing yum can do is fail. There are a few ways to work "fix" this:
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     1. Contact the upstream for the repository and get them to fix the problem.
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     2. Reconfigure the baseurl/etc. for the repository, to point to a working
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        upstream. This is most often useful if you are using a newer
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        distribution release than is supported by the repository (and the
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        packages for the previous distribution release still work).
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     3. Run the command with the repository temporarily disabled
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            yum --disablerepo=<repoid> ...
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     4. Disable the repository permanently, so yum won't use it by default. Yum
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        will then just ignore the repository until you permanently enable it
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        again or use --enablerepo for temporary usage:
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            yum-config-manager --disable <repoid>
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        or
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            subscription-manager repos --disable=<repoid>
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     5. Configure the failing repository to be skipped, if it is unavailable.
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        Note that yum will try to contact the repo. when it runs most commands,
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        so will have to try and fail each time (and thus. yum will be be much
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        slower). If it is a very temporary problem though, this is often a nice
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        compromise:
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            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true
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Cannot find a valid baseurl for repo: base/7/x86_64

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[root@localhost ~]# yum clean all      # Clear all local yum caches
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Loaded plugins: fastestmirror, langpacks
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Cleaning repos: local
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Cleaning up everything
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Maybe you want: rm -rf /var/cache/yum, to also free up space taken by orphaned data from disabled or removed repos
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Cleaning up list of fastest mirrors
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[root@localhost ~]# yum makecache      # Regenerate the local yum cache
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Loaded plugins: fastestmirror, langpacks
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Determining fastest mirrors
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local                                                                                            | 3.6 kB  00:00:00
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(1/4): local/group_gz                                                                            | 153 kB  00:00:00
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(2/4): local/filelists_db                                                                        | 3.3 MB  00:00:00
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(3/4): local/primary_db                                                                          | 3.3 MB  00:00:00
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(4/4): local/other_db                                                                            | 1.3 MB  00:00:00
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Metadata Cache Created
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[root@localhost ~]# yum search openssl     # Verifying local yum sources
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Loaded plugins: fastestmirror, langpacks
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Loading mirror speeds from cached hostfile
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================================================= N/S matched: openssl =================================================
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apr-util-openssl.x86_64 : APR utility library OpenSSL crytpo support
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openssl-devel.x86_64 : Files for development of applications which will use OpenSSL
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perl-Crypt-OpenSSL-Bignum.x86_64 : Perl interface to OpenSSL for Bignum
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perl-Crypt-OpenSSL-RSA.x86_64 : Perl interface to OpenSSL for RSA
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perl-Crypt-OpenSSL-Random.x86_64 : Perl interface to OpenSSL for Random
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pyOpenSSL.x86_64 : Python wrapper module around the OpenSSL library
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xmlsec1-openssl.x86_64 : OpenSSL crypto plugin for XML Security Library
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m2crypto.x86_64 : Support for using OpenSSL in python scripts
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nss_compat_ossl.x86_64 : Source-level compatibility library for OpenSSL to NSS porting
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openssl.x86_64 : Utilities from the general purpose cryptography library with TLS implementation
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openssl-libs.x86_64 : A general purpose cryptography library with TLS implementation
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openssl098e.x86_64 : A compatibility version of a general cryptography and TLS library
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perl-Crypt-SSLeay.x86_64 : Crypt::SSLeay - OpenSSL glue that provides LWP https support
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perl-Net-SSLeay.x86_64 : Perl extension for using OpenSSL
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qca-ossl.x86_64 : OpenSSL plugin for the Qt Cryptographic Architecture v2
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  Name and summary matches only, use "search all" for everything.
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[root@localhost ~]#