LinuxQuestions.org - yum repository problems

The first main, general problem is the lack of documentation of the yum tool -not user documentation, but development and internals documentation. Also i found only small tutorials about how to make a yum repository. No troubleshooting or details.
Anyway if you have something relevant, which i miss- i hope i do, please post a link.

Specifically:
I face problems, which as far as i understand have to do with repomd.xml (no documentation in order to understand what it is).
I've used apache and vsftp for my repository, but both don't work. The strange thing is that via apache-http, i maneged to install ONE package (gnumeric) and it's dependencies!! Nothing else i've tried so far.

My guess is that i have to customize repomd.xml, but i don't know how.

Samples:

Code:

[root@alexandros yum.repos.d]# yum install abiword

Setting up Install Process

Setting up repositories

ftp://alexandros/pub/linux/fedora-co...ta/repomd.xml: [Errno 4] IOError: [Errno ftp error] 550 Failed to change directory.

Trying other mirror.

Cannot open/read repomd.xml file for repository: dag

failure: repodata/repomd.xml from dag: [Errno 256] No more mirrors to try.

[root@alexandros yum.repos.d]#

having taken out dag.repo and using http:

Code:

[root@alexandros yum.repos.d]# yum install abiword

Setting up Install Process

Setting up repositories

http://alexandros/pub/linux/fedora-c...ta/repomd.xml: [Errno 4] IOError: HTTP Error 404: Date: Sun, 24 Jul 2005 14:25:57 GMT

Server: Apache/2.0.54 (Fedora)

Content-Length: 392

Content-Type: text/html; charset=iso-8859-1

Trying other mirror.

Cannot open/read repomd.xml file for repository: updates-released

failure: repodata/repomd.xml from updates-released: [Errno 256] No more mirrors to try.