Finally we can call on YUM to install the rest of our system:

yum –installroot=/var/tmp/chroot install -y rpm-build yum

[root@app3 chroot]# yum –installroot=/var/tmp/chroot install -y rpm-build yum
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
Eg. $releasever is not a valid release or hasnt been released yet/
removing mirrorlist with no valid mirrors: /var/tmp/chroot/var/cache/yum/addons/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: addons

[root@app3 chroot]# yum –disablerepo=addons –installroot=/var/tmp/chroot install -y rpm-build yum
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
Eg. $releasever is not a valid release or hasnt been released yet/
removing mirrorlist with no valid mirrors: /var/tmp/chroot/var/cache/yum/base/mirrorlist.txt

Cannot find a valid baseurl for repo: base