To get repotrack, install yum-utils.
yum install yum-utils
repotrack -p DIR PKG
where DIR is the directory to download rpms and PKG is the actual package you want. Wild card is allowed.
As an example, following command downlads all ncurses-packages and all dependencies to /repo/rpm directory
repotrack -p /repo/rpm ncurses*
To temporarily change the host name, use command:
To permanently change the hostname, open file /etc/sysconfig/network. Use, for example, vi-editor:
Find and change following line to your host name (and domain)
save file and restart network service
service network restart
This works in CentOS and Red Hat version 6.x. You may also need to change /etc/hosts file.