yum is an interactive, rpm based, package manager. It can automatically perform system updates, including dependancy analysis and obsolete processing based on "repository" metadata. It can also perform installation of new packages, removal of old packages and perform queries on the installed and/or available packages among many other commands/services (see below). yum is similar to other high level package managers like apt-get and smart.
After install Fedora Core, some default YUM repository is stored in /etc/yum.repos.d. These repositories are URLs located some where in the Internet. You need an internet connection in order to enjoy the convenient of yum to update your system. It is rather inconvenient if you have a slow internet connection or you have many machines to update via yum.
A good approach to overcome these problems is setup a local repositories without to avoid grabbing RPM packages via Internet.
Setup a local repository for YUM
First, we need to disable default YUM repository configuration installed by Fedora:
[root@localhost yum.repos.d]# cd /etc/yum.repos.d/
[root@localhost yum.repos.d]# ls -al
total 28
drwxr-xr-x. 2 root root 4096 2009-10-07 09:16 .
drwxr-xr-x. 56 root root 4096 2009-10-07 09:17 ..
-rw-r--r--. 1 root root 1785 2009-05-12 06:45 fedora-rawhide.repo
-rw-r--r--. 1 root root 1144 2009-05-12 06:45 fedora.repo
-rw-r--r--. 1 root root 1105 2009-05-12 06:45 fedora-updates.repo
-rw-r--r--. 1 root root 1163 2009-05-12 06:45 fedora-updates-testing.repo
To disable these repositories, rename all files to *.repo.old:
[root@localhost yum.repos.d]# cd /etc/yum.repos.d/
[root@localhost yum.repos.d]# ls -al
total 28
drwxr-xr-x. 2 root root 4096 2009-10-07 09:16 .
drwxr-xr-x. 56 root root 4096 2009-10-07 09:17 ..
-rw-r--r--. 1 root root 1785 2009-05-12 06:45 fedora-rawhide.repo.old
-rw-r--r--. 1 root root 1144 2009-05-12 06:45 fedora.repo.old
-rw-r--r--. 1 root root 1105 2009-05-12 06:45 fedora-updates.repo.old
-rw-r--r--. 1 root root 1163 2009-05-12 06:45 fedora-updates-testing.repo.old
Create local repository
In this example, the local repository is an Fedora Core ISO image mount under /mnt/cdrom.
Create a local repository configuration file it and store in /etc/yum.repos.d:
[root@localhost yum.repos.d]# cat local.repo
[local]
name=ISO
baseurl=file:///mnt/cdrom
You may now start using YUM to install packages as lightning speed:
[root@localhost etc]# yum install samba
Troubleshoot: Public key for lzma-libs-4.32.7-2.fc11.i586.rpm is not installed
If you encounter an error message like “Public key for ***.rpm is not installed” when running “yum install”, you need to import the RPM public key for the local repository into RPM database first.
The RPM public key is usually reside in the root of ISO image:
[root@localhost cdrom]# ls /mnt/cdrom -al
total 453
drwxr-sr-x. 7 root 499 4096 2009-06-03 06:05 .
drwxr-xr-x. 3 root root 4096 2009-10-07 09:11 ..
-rw-r--r--. 1 root 499 37 2009-06-03 06:04 .discinfo
drwxr-xr-x. 3 root root 2048 2009-06-03 06:02 EFI
-rw-r--r--. 2 root root 18363 2007-07-04 06:06 GPL
drwxr-sr-x. 3 root 499 2048 2009-06-03 06:04 images
drwxr-sr-x. 2 root 499 2048 2009-06-03 06:02 isolinux
-rw-r--r--. 1 root 499 95 2009-06-03 06:05 media.repo
drwxr-sr-x. 2 root 499 405504 2009-06-03 05:48 Packages
-rw-r--r--. 2 root root 10581 2009-05-14 12:59 README-BURNING-ISOS-en_US.txt
drwxr-sr-x. 2 root 499 4096 2009-06-03 06:05 repodata
lrwxrwxrwx. 2 root root 29 2009-06-03 05:51 RPM-GPG-KEY-fedora -> RPM-GPG-KEY-fedora-11-primary
-rw-r--r--. 2 root root 1653 2009-05-12 06:45 RPM-GPG-KEY-fedora-11-primary
lrwxrwxrwx. 2 root root 29 2009-06-03 05:51 RPM-GPG-KEY-fedora-i386 -> RPM-GPG-KEY-fedora-11-primary
-rw-r--r--. 2 root root 1694 2009-05-12 06:45 RPM-GPG-KEY-fedora-ia64
lrwxrwxrwx. 2 root root 29 2009-06-03 05:51 RPM-GPG-KEY-fedora-ppc -> RPM-GPG-KEY-fedora-11-primary
lrwxrwxrwx. 2 root root 29 2009-06-03 05:51 RPM-GPG-KEY-fedora-ppc64 -> RPM-GPG-KEY-fedora-11-primary
lrwxrwxrwx. 2 root root 29 2009-06-03 05:51 RPM-GPG-KEY-fedora-x86_64 -> RPM-GPG-KEY-fedora-11-primary
-r--r--r--. 1 root root 4011 2009-06-03 06:05 TRANS.TBL
-rw-r--r--. 1 root 499 1437 2009-06-03 06:04 .treeinfo
To install the public key, try this:
[root@localhost cdrom]# rpm --import RPM-GPG-KEY-fedora
You may proceed to "yum install” as usual now.
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