Re: How are OS updates handled by default in FC5?
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The system ist always updated with yum. Yum downloads rpm files and
installes them. It's not really a frontend for the rpm command, as it
manipulates the rpm database directly instead of calling the rpm
command. Anyway the result is always the installation/update of normal
rpm files.
The dependencies between rpm files are described by xml files, which
have to reside in a directory called repodata. Actually the existence of
this directory containing the description files makes a normal directory
with rpm files to a yum repository. if you'd like to install a program,
that requires another program or library, yum will detect this
dependency with the help of these xml files and will automatically
download an install the required rpm files.
You will not have to create these xml descriptions files by hand if
you're going to setup your own repository. This can be done with the
command createrepo on the serverside. createrepo examines all rpm files
in the current directory and subdirectories and generates the
corresponding dependency description. It creates the repodata directory
automatically.
If you mirror a repository (that is the directory hierarchy containing
the rpm files and this repodata directory), you will not have to run
this repodata command, as it's already provided by the mirror server.
If you create your own rpm files, you will always have to run createrepo
each time you add an updated or new rpm file to you repository/directory.
On the client side you will only have to run "yum -y update", either
manually or by a cronjob. The latter is the solution chosen by fedora.
Of course the URL of the repository must be specified in a file with the
suffix ".repo" in /etc/yum.repos.d . Use the already existent repo files
as an example how these files look like. The syntax is very easy.
greets Boris
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