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Old 05-24-2013, 05:15 AM   #1
Registered: Nov 2012
Posts: 48

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Install Centos issue: in httpd and ftpd can't find install.img


I am following on the Asghar Ghori's book for RHCSA and RHCE exam.

Scenario : I am using default KVM to setup a virutal machine through ftpd or httpd setup:

I setup the httpd and ftpd ,put correct selinux context and Iptable entries check the files by opening them in the browser and the seems to be in there. I am copying the setup files under /var/www/html/rhel6/cdrom for httpd and /var/ftp/rhel6/cdrom.

but it always hangs in the VM installation when its trying to find install.img and gives can't retrieve install.img

I only once had a luck for which I have no fixed explanation. I turned off the IPTABLES completely and it picked up the images but later it didn't even if I turn on/off the iptables, I even set the selinux on permissive but still same error. I have checked on the internet and some people say they tried same thing with Scietific linux and it went out smoothly without any problem and its can be a bug with Centos. This is kinda getting frustrating as I am not getting anywhere with this. Will be thankful for your help.


Last edited by manuce; 05-24-2013 at 05:16 AM.
Old 05-24-2013, 11:49 AM   #2
Registered: Nov 2012
Posts: 48

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anyone plz before I start pulling my hairs off
Old 05-25-2013, 05:56 AM   #3
Registered: May 2012
Posts: 200
Blog Entries: 3

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Have you installed these packages on your centOS
$ yum install kvm libvirt libvirt-python python-virtinst
1) Configure a bridge (Debian/Ubuntu or Red Hat/Fedora) to use a single network interface for all your virtual machines.

2) Create the virtual machine (a RHEL 5 virtual machine in this example): virt-install --name=guest_name --arch=x86_64 --vcpus=1 --ram=512 --os-type=linux --os-variant=rhel5 --hvm --connect=qemu:///system --network bridge:br0 --cdrom=/var/lib/libvirt/images/rhel5-x86_64.iso --disk path=/mnt/virtual_machines/guest_name.img,size=20 --accelerate --vnc --noautoconsole --keymap=es
Explanation of the params:
name: name of the guest.
arch: architecture of the guest.
vcpus: number of CPUs assigned to the guest.
ram: MB of RAM assigned to the guest.
os-type and os-variant: available options can be checked using man virt-install.
hvm: use full virtualization.
connect: connect to the hypervisor.
network bridge: the bridge to use for the guest.
cdrom: the ISO of the operating system to install.
disk path=x,size=y: path and size of the image file for the guest.
accelerate: make use of the KVM acceleration capabilities if available.
vnc: export a virtual console over VNC to the guest.
noautoconsole: Don’t automatically try to connect to the guest console.
keymap: keyboard layout for the VNC console

3) Use a VNC client to connect to the guest (port 5900 or 5901 if you already have a VNC server listening on port 5900) and install the operating system.
Old 05-25-2013, 12:23 PM   #4
Registered: May 2013
Location: Iceland
Distribution: RHEL/CentOS
Posts: 32

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Did you enable nat ?

net.ipv4.ip_forward = 1
In /etc/sysctl.conf

Last edited by Armann; 05-25-2013 at 12:27 PM.
Old 05-25-2013, 12:26 PM   #5
Registered: May 2013
Location: Iceland
Distribution: RHEL/CentOS
Posts: 32

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Forgot, if it's not enabled write sysctl -p to make it active after you changed the value to 1.
Old 05-25-2013, 07:34 PM   #6
Registered: Nov 2012
Posts: 48

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Armann you are Genious! absolutely it worked liked a charm. Thank you so much Armann impressive stuff


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