Yum Repositories Control or “No package … available”

By | August 8, 2019

This article is related to “How to edit Mac dmg file on Linux Platform“. Let us consider the situation that you cannot install some package on CentOS device because the yum command fails with the error “No package available”. However previously you successfully installed the same package on other CentOS machines without problem. Yes it is possible that the product you want to install has been discontinued and deleted from all repositories, but it is quite unlikely, probably the repositories are misconfigured or missing. Here two real examples with solving procedures. The first one is installation of genisoimage:


# yum install genisoimage
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
No package genisoimage available.
Error: Nothing to do



Let check repositories first, the yum repositories are located in /etc/yum.repos.d directory. Open /etc/yum.repos.d/CentOS-Base.repo in the text editor and change all “enabled=0” string to “enabled=1”, in other words we enable all repositories defined in /etc/yum.repos.d/CentOS-Base.repo file. Save the file. Try install genisoimage again and success: you can find where takes it from:


# yum install genisoimage
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: centosmirror.netcup.net
* centosplus: mirror.centos.serverforge.org
* extras: centos.mirror.rafal.ca
* updates: mirror.calgah.com
Resolving Dependencies
–> Running transaction check
—> Package genisoimage.x86_64 0:1.1.11-25.el7 will be installed
–> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
genisoimage x86_64 1.1.11-25.el7 base 299 k

Transaction Summary
================================================================================
Install 1 Package

Total download size: 299 k
Installed size: 1.0 M
Is this ok [y/d/N]:

It is possible to enable or disable repositories using yum-config-manager command. for example to enable “base” repository in /etc/yum.repos.d/CentOS-Base.repo


[base]
name=CentOS-$releasever – Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
repo_gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=0

execute the following command:


# yum-config-manager –enable base

The “yum-config-manager –enable base” modifies value of “enabled” to one, similar as we did with text editor:


[base]
name=CentOS-$releasever – Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
repo_gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
enabled=1

To disable this repository again, run:


# yum-config-manager –disable base

To enable all repositories (I do not suggest to do it):


# yum-config-manager –enable \*

However it is not always good, after enabling all repositories yum command begins to report errors something like this:


failure: repodata/repomd.xml.asc from C7.0.1406-base: [Errno 256] No more mirrors to try.
http://vault.centos.org/7.0.1406/os/x86_64/repodata/repomd.xml.asc: [Errno 14] HTTP Error 404 – Not Found

To fix these errors I disabled all repositories again:


# yum-config-manager –disable \*

and started to enable them one per one beginning from /etc/yum.repos.d/CentOS-Base.repo, very time consuming.
Now the second example the installation of dmg2img.
After playing with repository enable/disabling I could not find the right one, so the conclusion was I need to add new repository for dmg2img installtion. After googling I found that the repository is
https://copr.fedorainfracloud.org/coprs/scx/dmg2img/repo/epel-7/scx-dmg2img-epel-7.repo. There are 2 way to add this repository:


yum-config-manager –add-repo https://copr.fedorainfracloud.org/coprs/scx/dmg2img/repo/epel-7/scx-dmg2img-epel-7.repo

or


curl ‘https://copr.fedorainfracloud.org/coprs/scx/dmg2img/repo/epel-7/scx-dmg2img-epel-7.repo’ > ‘/etc/yum.repos.d/scx-dmg2img-epel-7.repo’

Verified that repository is enabled:


# cat scx-dmg2img-epel-7.repo
[copr:copr.fedorainfracloud.org:scx:dmg2img]
name=Copr repo for dmg2img owned by scx
baseurl=https://copr-be.cloud.fedoraproject.org/results/scx/dmg2img/epel-7-$basearch/
type=rpm-md
skip_if_unavailable=True
gpgcheck=1
gpgkey=https://copr-be.cloud.fedoraproject.org/results/scx/dmg2img/pubkey.gpg
repo_gpgcheck=0
enabled=1
enabled_metadata=1

and began installation of dmg2img:


# yum install dmg2img
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: centos.mirror.iweb.ca
* centosplus: centos.mirror.iweb.ca
* elrepo: ftp.osuosl.org
* extras: mirror.calgah.com
* updates: mirror.calgah.com
base/7/x86_64/signature | 811 B 00:00
base/7/x86_64/signature | 3.6 kB 00:00 !!!
centosplus/7/x86_64/signature | 811 B 00:00
centosplus/7/x86_64/signature | 3.4 kB 00:00 !!!
copr:copr.fedorainfracloud.org:scx:dmg2img | 3.0 kB 00:00
elrepo | 2.9 kB 00:00
extras/7/x86_64/signature | 811 B 00:00
extras/7/x86_64/signature | 3.4 kB 00:00 !!!
support/x86_64/signature | 490 B 00:00
support/x86_64/signature | 2.9 kB 00:00 !!!
updates/7/x86_64/signature | 811 B 00:00
updates/7/x86_64/signature | 3.4 kB 00:00 !!!
elrepo/primary_db | 390 kB 00:00
Resolving Dependencies
–> Running transaction check
—> Package dmg2img.x86_64 0:1.6.7-4.el7.centos will be installed
–> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package
Arch Version Repository Size
================================================================================
Installing:
dmg2img
x86_64 1.6.7-4.el7.centos copr:copr.fedorainfracloud.org:scx:dmg2img 32 k

Transaction Summary
================================================================================
Install 1 Package

Total download size: 32 k
Installed size: 65 k
Is this ok [y/d/N]: y

For more information about adding, enabling, and disabling a yum repositories.

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