After you configure the Compute service on the controller node, you must configure another system as a compute node. The compute node receives requests from the controller node and hosts virtual machine instances. You can run all services on a single node, but the examples in this guide use separate systems. This makes it easy to scale horizontally by adding additional Compute nodes following the instructions in this section. The Compute service relies on a hypervisor to run virtual machine instances. OpenStack can use various hypervisors, but this guide uses KVM. Install the Compute packages: # apt-get install nova-compute-kvm python-guestfs When prompted to create a supermin appliance, respond yes. To use the meta-packages and install other components on your compute node, such as OpenStack Networking and Ceilometer agents, run this command: # apt-get install openstack-compute-node The controller node has the openstack-proxy-node and openstack-toaster meta-packages that install openstack-proxy-node and openstack-toaster at the same time. # yum install openstack-nova-compute # zypper install openstack-nova-compute kvm openstack-utils Respond to the prompts for database management, [keystone_authtoken] settings, RabbitMQ credentials, and API endpoint registration. For security reasons, the Linux kernel is not readable by normal users which restricts hypervisor services such as qemu and libguestfs. For details, see this bug. To make the current kernel readable, run: # dpkg-statoverride --update --add root root 0644 /boot/vmlinuz-$(uname -r) To also enable this override for all future kernel updates, create the file /etc/kernel/postinst.d/statoverride containing:#!/bin/sh version="$1" # passing the kernel version is required [ -z "${version}" ] && exit 0 dpkg-statoverride --update --add root root 0644 /boot/vmlinuz-${version} Remember to make the file executable: # chmod +x /etc/kernel/postinst.d/statoverride Edit the /etc/nova/nova.conf configuration file: # openstack-config --set /etc/nova/nova.conf database connection mysql://nova:NOVA_DBPASS@controller/nova # openstack-config --set /etc/nova/nova.conf DEFAULT auth_strategy keystone # openstack-config --set /etc/nova/nova.conf keystone_authtoken auth_uri http://controller:5000 # openstack-config --set /etc/nova/nova.conf keystone_authtoken auth_host controller # openstack-config --set /etc/nova/nova.conf keystone_authtoken auth_protocol http # openstack-config --set /etc/nova/nova.conf keystone_authtoken auth_port 35357 # openstack-config --set /etc/nova/nova.conf keystone_authtoken admin_user nova # openstack-config --set /etc/nova/nova.conf keystone_authtoken admin_tenant_name service # openstack-config --set /etc/nova/nova.conf keystone_authtoken admin_password NOVA_PASS Edit the /etc/nova/nova.conf configuration file and add these lines to the appropriate sections: [DEFAULT] ... auth_strategy = keystone ... [database] # The SQLAlchemy connection string used to connect to the database connection = mysql://nova:NOVA_DBPASS@controller/nova [keystone_authtoken] auth_uri = http://controller:5000 auth_host = controller auth_port = 35357 auth_protocol = http admin_tenant_name = service admin_user = nova admin_password = NOVA_PASS Configure the Compute service to use the Qpid message broker by setting these configuration keys: # openstack-config --set /etc/nova/nova.conf \ DEFAULT rpc_backend qpid # openstack-config --set /etc/nova/nova.conf DEFAULT qpid_hostname controller Configure the Compute service to use the RabbitMQ message broker by setting these configuration keys in the [DEFAULT] configuration group of the /etc/nova/nova.conf file: [DEFAULT] ... rpc_backend = rabbit rabbit_host = controller rabbit_password = RABBIT_PASS Configure the Compute service to use the RabbitMQ message broker by setting these configuration keys: # openstack-config --set /etc/nova/nova.conf \ DEFAULT rpc_backend nova.rpc.impl_kombu # openstack-config --set /etc/nova/nova.conf DEFAULT rabbit_host controller # openstack-config --set /etc/nova/nova.conf DEFAULT rabbit_password RABBIT_PASS Configure Compute to provide remote console access to instances. # openstack-config --set /etc/nova/nova.conf DEFAULT my_ip 10.0.0.31 # openstack-config --set /etc/nova/nova.conf DEFAULT vnc_enabled True # openstack-config --set /etc/nova/nova.conf DEFAULT vncserver_listen 0.0.0.0 # openstack-config --set /etc/nova/nova.conf DEFAULT vncserver_proxyclient_address 10.0.0.31 # openstack-config --set /etc/nova/nova.conf \ DEFAULT novncproxy_base_url http://controller:6080/vnc_auto.html Edit /etc/nova/nova.conf and add the following keys under the [DEFAULT] section: [DEFAULT] ... my_ip = 10.0.0.31 vnc_enabled = True vncserver_listen = 0.0.0.0 vncserver_proxyclient_address = 10.0.0.31 novncproxy_base_url = http://controller:6080/vnc_auto.html Specify the host that runs the Image Service. Edit /etc/nova/nova.conf file and add these lines to the [DEFAULT] section: # openstack-config --set /etc/nova/nova.conf DEFAULT glance_host controller [DEFAULT] ... glance_host = controller You must determine whether your system's processor and/or hypervisor support hardware acceleration for virtual machines. Run the following command: $ egrep -c '(vmx|svm)' /proc/cpuinfo If this command returns a value of one or greater, your system supports hardware acceleration which typically requires no additional configuration. If this command returns a value of zero, your system does not support hardware acceleration and you must configure libvirt to use QEMU instead of KVM. Edit the [libvirt] section in the /etc/nova/nova-compute.conf file to modify this key: [libvirt] ... virt_type = qemu Run the following command: # openstack-config --set /etc/nova/nova.conf libvirt virt_type qemu On Ubuntu 12.04, kernels backported from newer releases may not automatically load the KVM modules for hardware acceleration when the system boots. In this case, launching an instance will fail with the following message in the /var/log/nova/nova-compute.log file: libvirtError: internal error: no supported architecture for os type 'hvm' As a workaround for this issue, you must add the appropriate module for your system to the /etc/modules file. For systems with Intel processors, run the following command: # echo 'kvm_intel' >> /etc/modules For systems with AMD processors, run the following command: # echo 'kvm_amd' >> /etc/modules Remove the SQLite database created by the packages: # rm /var/lib/nova/nova.sqlite Start the Compute service and configure it to start when the system boots: Restart the Compute service: # service nova-compute restart # service libvirtd start # service messagebus start # chkconfig libvirtd on # chkconfig messagebus on # service openstack-nova-compute start # chkconfig openstack-nova-compute on # service libvirtd start # chkconfig libvirtd on # service openstack-nova-compute start # chkconfig openstack-nova-compute on