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I can be useful to know how to create your own repository if you want to test setting up and working with repositories. This allows you to put your own RPMs in a directory and publish that directory as a repository. It is also useful to know how to do this if you have installed RHEL and not connected it to RHN, which means that you would not have any repositories at all.
You need to copy all RPM packages to a directory that you want to use as a repository, and after doing that, you need to use the createrepo command to generate the metadata that enables you to use that directory as a repository.
yum -y install createrepo
mount -o loop /var/ISO/centos75.iso /mnt
cp -rp /mnt /srv
that will create directory /srv/mnt with all files that ISO contains
d620@ROOT:/srv/local_centos75 # ll total 328K drwxr-xr-x. 3 root root 35 May 3 2018 EFI/ drwxr-xr-x. 3 root root 57 May 3 2018 images/ drwxr-xr-x. 2 root root 198 May 3 2018 isolinux/ drwxr-xr-x. 2 root root 43 May 3 2018 LiveOS/ drwxrwxr-x. 2 root root 216K May 3 2018 Packages/ drwxrwxr-x. 2 root root 4.0K May 3 2018 repodata/ -rw-rw-r--. 1 root root 14 May 2 2018 CentOS_BuildTag -rw-r--r--. 1 root root 29 May 3 2018 .discinfo -rw-rw-r--. 1 root root 227 Aug 30 2017 EULA -rw-rw-r--. 1 root root 18K Dec 9 2015 GPL -rw-rw-r--. 1 root root 1.7K Dec 9 2015 RPM-GPG-KEY-CentOS-7 -rw-rw-r--. 1 root root 1.7K Dec 9 2015 RPM-GPG-KEY-CentOS-Testing-7 -r--r--r--. 1 root root 2.9K May 3 2018 TRANS.TBL -rw-r--r--. 1 root root 354 May 3 2018 .treeinfo
mv /srv/mnt /srv/local_centos75
d620@ROOT:/etc/yum.repos.d # createrepo /srv/local_centos75 Spawning worker 0 with 1986 pkgs Spawning worker 1 with 1985 pkgs Workers Finished Saving Primary metadata Saving file lists metadata Saving other metadata Generating sqlite DBs Sqlite DBs complete
This command generates the repository metadata, which allows you to use this repository for yum
The file should have the following contents:
[local] name=CentOS-75-local baseurl=file:///srv/local_centos7 gpgcheck=0
NOTE: Label like [local] above should be unique to this set of repo files. You can't use already used labels
We have mounted the ISO file of the installation disk to copy files from it. Alternative way to get repository files is by using the yumdownloader utility. This utility enables you to download list of packages directly from the repository to the current directory. For instance, type yumdownloader nmap to download the nmap RPM package to the current directory.
You can also you wget to replicate existing repositories.
# yum repolist
Google matched content
Creating A Local Yum Repository (CentOS)
Creating a local yum repository on CentOS-RHEL 7
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