- mykvm is a small python script to create multiple kvm instances from the yaml configuration file.
- mykvm is using some nice tools like virt-install, vmbuilder, qemu-img and ansible.
-
Install kvm, virt-install, vmbuilder and some packages for ansible. Ansible will be used to initialize kvm instances.
$ sudo apt-get update $ sudo apt-get install kvm libvirt-bin virtinst python-vm-builder python-dev python-pip -
If you don't have any ssh key, generate a new ssh key. This key will be used to ssh into the kvm instances.
$ ssh-keygen -t rsa -
Install mykvm with pip
$ sudo pip install mykvm -
Now, mykvm is ready
$ mykvm Usage: mykvm command [<args>] Available subcommands: init up [<vm>] halt destroy status
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Create a new directory
$ mkdir grizzly $ cd grizzly -
Run init command. If there's no base image, vmbuilder will create a precise64.qcow2 base image.
$ mykvm init initialize mykvm * create mykvm.yml * copy vmbuilder script * copy ansible files * build base image /home/cirros/.mykvm/base/precise64.qcow2 + rm -rf ubuntu-kvm + SUDOERS_TMPL=/etc/vmbuilder/ubuntu/sudoers.tmpl + grep -q -e ubuntu /etc/vmbuilder/ubuntu/sudoers.tmpl + sudo sed -i '$a ubuntu ALL=(ALL) NOPASSWD:ALL\n#includedir /etc/sudoers.d' /etc/vmbuilder/ubuntu/sudoers.tmpl + sudo vmbuilder kvm ubuntu --suite precise --arch amd64 --flavour virtual --ssh-user-key /home/cirros/.ssh/id_rsa.pub ... ... -
Up command will start networks and kvm instances with configurations in mykvm.yml.
$ mykvm up -
Check the status of kvm instances.
$ mykvm status status Id Name State ---------------------------------- 1 controller running 2 netnode running 3 compute1 running 4 compute2 running -
You can use virsh to control kvm instances.
$ sudo virsh list Id Name State ---------------------------------- 1 controller running 2 netnode running 3 compute1 running 4 compute2 running -
You can ssh into the kvm instances with hostname. /etc/resolv.conf is updated to use the dnsmasq of first network in mykvm.yml as a nameserver.
$ ssh ubuntu@controller -
Destroy command will stop networks and destroy kvm instances.
$ mykvm destroy
-
mykvm.yml configuration file look like this.
-
You can define multiple networks and vm instances with multiple network interfaces.
-
You can create nested kvm instances with 'kvm_nested' option.
$ cat mykvm.yml --- - networks: - name: mgmt external: true autostart: true ip: 10.0.10.1 - name: int ip: 10.0.20.1 - name: ext external: true ip: 192.168.101.1 - vms: - name: controller vcpus: 1 ram: 2048 template: precise64.qcow2 netdevs: - network: mgmt ip: 10.0.10.10 - network: ext ip: 192.168.101.10 - name: netnode vcpus: 2 ram: 1024 template: precise64.qcow2 netdevs: - network: mgmt ip: 10.0.10.11 - network: int ip: 10.0.20.11 - network: ext ip: 192.168.101.11 - name: compute1 vcpus: 2 kvm_nested: True ram: 2048 template: precise64.qcow2 netdevs: - network: mgmt ip: 10.0.10.12 - network: int ip: 10.0.20.12 -
Nested KVM Hypervisor Support
$ echo "options kvm-intel nested=1" | sudo tee /etc/modprobe.d/kvm-intel.conf $ sudo reboot $ cat /sys/module/kvm_intel/parameters/nested Y
- Only tested on Ubuntu 12.04 boxes with intel cpu.
- Sometimes the base image generated by vmbuilder is not bootable. In that case, delete ubuntu-kvm directory and the base image under ~/.mykvm/base and run again init command to recreate a base image.
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