re-use of Oracle Linux VBox image

For every Linux distribution I have created an empty Oracle Linux image, containing all packages and kernel settings to quickly install Oracle Software.

Re-using this image needs some modifications to hostname, naming etc. This blog entry is mainly for me not to forget something.

1. Import Oracle Linux VM.
2. Update packages
    # yum update
    Afertwards reboot to start with updated kernel.
    # reboot
3. Upgrade VBox guest additions
4. Identify Oracle Linux Distribution
    # cat /etc/issue.net
5. Change Hostname
   a) Change Hostname in /etc/sysconfig/network
   b) Change Hostname in /etc/hosts
6. Changefixed IP address
   a) change in Menue -> Preferences -> Network Connections
   b) Change in /etc/hosts
7. Verify all changes during startup
    # reboot
    Hit the esc- button during startup to see detailed startup information.
    Verify that all services are ok.
8. Shrink VBox
    Finally it is good to shrink the image before exporting.
    See: http://fmw-deutsch.blogspot.de/2013/10/vbox-images-schrumpfen.html
    # dd if=/dev/zero of=zero.file
    When the comand has finished, delete the file and shutdown the VM:
    # rm zero.file
    # poweroff
    Navigat in a terminal to the *vdi file. Now shrink the file:
    VBoxManage modifyhd *.vdi --compact
9. Export the VM. Done.
    (Without shrinking my image size was 2.47GB, only 1.58GB after shrinking!)