270 lines
8.7 KiB
ReStructuredText
270 lines
8.7 KiB
ReStructuredText
Install and configure a compute node for Red Hat Enterprise Linux and CentOS
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This section describes how to install and configure the Compute service on a
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compute node. The service supports several hypervisors to deploy instances or
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virtual machines (VMs). For simplicity, this configuration uses the Quick
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EMUlator (QEMU) hypervisor with the kernel-based VM (KVM) extension on compute
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nodes that support hardware acceleration for virtual machines. On legacy
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hardware, this configuration uses the generic QEMU hypervisor. You can follow
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these instructions with minor modifications to horizontally scale your
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environment with additional compute nodes.
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.. note::
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This section assumes that you are following the instructions in this guide
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step-by-step to configure the first compute node. If you want to configure
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additional compute nodes, prepare them in a similar fashion to the first
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compute node in the :ref:`example architectures
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<overview-example-architectures>` section. Each additional compute node
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requires a unique IP address.
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Install and configure components
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--------------------------------
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.. include:: shared/note_configuration_vary_by_distribution.rst
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#. Install the packages:
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.. code-block:: console
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# yum install openstack-nova-compute
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#. Edit the ``/etc/nova/nova.conf`` file and complete the following actions:
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* In the ``[DEFAULT]`` section, enable only the compute and
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metadata APIs:
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.. path /etc/nova/nova.conf
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.. code-block:: ini
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[DEFAULT]
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# ...
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enabled_apis = osapi_compute,metadata
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* In the ``[DEFAULT]`` section, configure ``RabbitMQ`` message queue access:
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.. path /etc/nova/nova.conf
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.. code-block:: ini
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[DEFAULT]
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# ...
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transport_url = rabbit://openstack:RABBIT_PASS@controller
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Replace ``RABBIT_PASS`` with the password you chose for the ``openstack``
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account in ``RabbitMQ``.
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* In the ``[api]`` and ``[keystone_authtoken]`` sections, configure Identity
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service access:
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.. path /etc/nova/nova.conf
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.. code-block:: ini
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[api]
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# ...
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auth_strategy = keystone
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[keystone_authtoken]
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# ...
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auth_url = http://controller:5000/v3
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memcached_servers = controller:11211
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auth_type = password
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project_domain_name = default
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user_domain_name = default
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project_name = service
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username = nova
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password = NOVA_PASS
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Replace ``NOVA_PASS`` with the password you chose for the ``nova`` user in
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the Identity service.
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.. note::
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Comment out or remove any other options in the ``[keystone_authtoken]``
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section.
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* In the ``[DEFAULT]`` section, configure the ``my_ip`` option:
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.. path /etc/nova/nova.conf
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.. code-block:: ini
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[DEFAULT]
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# ...
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my_ip = MANAGEMENT_INTERFACE_IP_ADDRESS
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Replace ``MANAGEMENT_INTERFACE_IP_ADDRESS`` with the IP address of the
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management network interface on your compute node, typically 10.0.0.31 for
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the first node in the :ref:`example architecture
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<overview-example-architectures>`.
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* In the ``[DEFAULT]`` section, enable support for the Networking service:
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.. path /etc/nova/nova.conf
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.. code-block:: ini
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[DEFAULT]
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# ...
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use_neutron = True
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firewall_driver = nova.virt.firewall.NoopFirewallDriver
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.. note::
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By default, Compute uses an internal firewall service. Since Networking
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includes a firewall service, you must disable the Compute firewall
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service by using the ``nova.virt.firewall.NoopFirewallDriver`` firewall
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driver.
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* In the ``[vnc]`` section, enable and configure remote console access:
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.. path /etc/nova/nova.conf
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.. code-block:: ini
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[vnc]
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# ...
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enabled = True
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server_listen = 0.0.0.0
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server_proxyclient_address = $my_ip
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novncproxy_base_url = http://controller:6080/vnc_auto.html
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The server component listens on all IP addresses and the proxy component
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only listens on the management interface IP address of the compute node.
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The base URL indicates the location where you can use a web browser to
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access remote consoles of instances on this compute node.
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.. note::
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If the web browser to access remote consoles resides on a host that
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cannot resolve the ``controller`` hostname, you must replace
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``controller`` with the management interface IP address of the
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controller node.
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* In the ``[glance]`` section, configure the location of the Image service
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API:
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.. path /etc/nova/nova.conf
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.. code-block:: ini
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[glance]
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# ...
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api_servers = http://controller:9292
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* In the ``[oslo_concurrency]`` section, configure the lock path:
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.. path /etc/nova/nova.conf
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.. code-block:: ini
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[oslo_concurrency]
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# ...
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lock_path = /var/lib/nova/tmp
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* In the ``[placement]`` section, configure the Placement API:
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.. path /etc/nova/nova.conf
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.. code-block:: ini
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[placement]
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# ...
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os_region_name = RegionOne
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project_domain_name = Default
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project_name = service
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auth_type = password
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user_domain_name = Default
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auth_url = http://controller:5000/v3
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username = placement
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password = PLACEMENT_PASS
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Replace ``PLACEMENT_PASS`` with the password you choose for the
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``placement`` user in the Identity service. Comment out any other options
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in the ``[placement]`` section.
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Finalize installation
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---------------------
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#. Determine whether your compute node supports hardware acceleration for
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virtual machines:
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.. code-block:: console
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$ egrep -c '(vmx|svm)' /proc/cpuinfo
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If this command returns a value of ``one or greater``, your compute node
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supports hardware acceleration which typically requires no additional
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configuration.
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If this command returns a value of ``zero``, your compute node does not
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support hardware acceleration and you must configure ``libvirt`` to use QEMU
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instead of KVM.
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* Edit the ``[libvirt]`` section in the ``/etc/nova/nova.conf`` file as
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follows:
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.. path /etc/nova/nova.conf
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.. code-block:: ini
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[libvirt]
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# ...
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virt_type = qemu
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#. Start the Compute service including its dependencies and configure them to
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start automatically when the system boots:
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.. code-block:: console
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# systemctl enable libvirtd.service openstack-nova-compute.service
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# systemctl start libvirtd.service openstack-nova-compute.service
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.. note::
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If the ``nova-compute`` service fails to start, check
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``/var/log/nova/nova-compute.log``. The error message ``AMQP server on
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controller:5672 is unreachable`` likely indicates that the firewall on the
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controller node is preventing access to port 5672. Configure the firewall
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to open port 5672 on the controller node and restart ``nova-compute``
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service on the compute node.
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Add the compute node to the cell database
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-----------------------------------------
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.. important::
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Run the following commands on the **controller** node.
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#. Source the admin credentials to enable admin-only CLI commands, then confirm
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there are compute hosts in the database:
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.. code-block:: console
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$ . admin-openrc
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$ openstack compute service list --service nova-compute
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+----+-------+--------------+------+-------+---------+----------------------------+
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| ID | Host | Binary | Zone | State | Status | Updated At |
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+----+-------+--------------+------+-------+---------+----------------------------+
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| 1 | node1 | nova-compute | nova | up | enabled | 2017-04-14T15:30:44.000000 |
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+----+-------+--------------+------+-------+---------+----------------------------+
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#. Discover compute hosts:
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.. code-block:: console
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# su -s /bin/sh -c "nova-manage cell_v2 discover_hosts --verbose" nova
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Found 2 cell mappings.
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Skipping cell0 since it does not contain hosts.
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Getting compute nodes from cell 'cell1': ad5a5985-a719-4567-98d8-8d148aaae4bc
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Found 1 computes in cell: ad5a5985-a719-4567-98d8-8d148aaae4bc
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Checking host mapping for compute host 'compute': fe58ddc1-1d65-4f87-9456-bc040dc106b3
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Creating host mapping for compute host 'compute': fe58ddc1-1d65-4f87-9456-bc040dc106b3
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.. note::
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When you add new compute nodes, you must run ``nova-manage cell_v2
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discover_hosts`` on the controller node to register those new compute
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nodes. Alternatively, you can set an appropriate interval in
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``/etc/nova/nova.conf``:
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.. code-block:: ini
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[scheduler]
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discover_hosts_in_cells_interval = 300
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