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I would like to post my notes as a little tutorial here. I am usually using these virtual machines as cheap staging servers. The first part of this tutorial, you hopefully need to do only once: creating a fresh Debian system. In the second part we will build on this image to create many different servers.

Creating A Base Debian System

We will create a Qemu machine and install Debian Lenny on it first:

# Download Debian image
wget http://debian.osuosl.org/debian-cdimage/current/i386/iso-cd/debian-504-i386-businesscard.iso

# Create base VM image
qemu-img create -f qcow2 debian.qcow2 2G

Our disk image will have a 2 Gigabyte size limit. You can pick a different size if you need.

Now we need to power on our VM and install Debian:

# Install Debian
qemu -enable-kvm -k tr -cdrom debian-504-i386-businesscard.iso -hda debian.qcow2 -boot d

You don’t need to allocate a large swap disk, 128MB should do just fine for a file/web server. Also I wouldn’t bother creating a seperate partition for /home/.

Next let’s log in as the user (www here) we have created to make final changes:

# logged in as user
dpkg-reconfigure console-data
aptitude install ssh sudo
echo "www ALL=(ALL) ALL" >> /etc/sudoers

At this point you might want to take a backup of debian.qcow2. (Even though we will open it only read-only from now on)

Creating The Actual VM

To save time and space we will use copy-on-write disks and re-use debian.qcow2.

# Create the actual VM's disk
qemu-img create -f qcow2 -o backing_file=debian.qcow2 actual.qcow2

Actually we are done. You can log in to your VM using the following command and start installing/configuring/running:

qemu -enable-kvm -k tr -hda actual.qcow2 -net user -net nic \
                                         -redir tcp:5022::22 \
                                         -redir tcp:9080::80

A few things to note about the command above:

• -enable-kvm is meaningful only if you have kvm kernel module installed. It improves performance a great deal, so it’s highly recommended.
• You probably need to change -k tr according to your keyboard’s layout.
• We are setting up two TCP redirections. 22 is for SSH and 80 is for HTTP. You can add more ports if you need.

Finally, I suggest you to prefer SSHing your VM instead of logging in directly:

# SSH into the VM
ssh -p 5022 www@localhost

I hope some of you find this useful.

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I would like to post my notes as a little tutorial here. I am usually using these virtual machines as cheap staging servers. The first part of this tutorial, you hopefully need to do only once: creating a fresh Debian system. In the second part we will build on this image to create many different servers. ## Creating A Base Debian System We will create a Qemu machine and install Debian Lenny on it first: # Download Debian image wget http://debian.osuosl.org/debian-cdimage/current/i386/iso-cd/debian-504-i386-businesscard.iso # Create base VM image qemu-img create -f qcow2 debian.qcow2 2G Our disk image will have a 2 Gigabyte size limit. You can pick a different size if you need. Now we need to power on our VM and install Debian: # Install Debian qemu -enable-kvm -k tr -cdrom debian-504-i386-businesscard.iso -hda debian.qcow2 -boot d You don't need to allocate a large swap disk, 128MB should do just fine for a file/web server. Also I wouldn't bother creating a seperate partition for `/home/`. Next let's log in as the user (`www` here) we have created to make final changes: # logged in as user dpkg-reconfigure console-data aptitude install ssh sudo echo "www ALL=(ALL) ALL" >> /etc/sudoers At this point you might want to take a backup of `debian.qcow2`. (Even though we will open it only read-only from now on) ## Creating The Actual VM To save time and space we will use copy-on-write disks and re-use `debian.qcow2`. # Create the actual VM's disk qemu-img create -f qcow2 -o backing_file=debian.qcow2 actual.qcow2 Actually we are done. You can log in to your VM using the following command and start installing/configuring/running: qemu -enable-kvm -k tr -hda actual.qcow2 -net user -net nic \ -redir tcp:5022::22 \ -redir tcp:9080::80 A few things to note about the command above: * `-enable-kvm` is meaningful only if you have `kvm` kernel module installed. It improves performance a great deal, so it's highly recommended. * You probably need to change `-k tr` according to your keyboard's layout. * We are setting up two TCP redirections. 22 is for SSH and 80 is for HTTP. You can add more ports if you need. Finally, I suggest you to prefer SSHing your VM instead of logging in directly: # SSH into the VM ssh -p 5022 www@localhost I hope some of you find this useful.

Tags: qemu, share, tutorial, vm

This entry was posted on Wednesday, July 7th, 2010 at 13:26 and is filed under Programming. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.