Configure a compute node:
1.Login to Compute node and install compute packages on it.
root@OSCMP-UA:~# apt-get install nova-compute-kvm python-guestfs Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: alembic binutils btrfs-tools cryptsetup cryptsetup-bin fontconfig-config fonts-dejavu-core genisoimage ghostscript gsfonts icoutils ieee-data jfsutils kpartx ldmtool libauthen-sasl-perl libcryptsetup4 libcups2
Click here to see the complete, Nova installation log
2. Make the kernel to readable for normal users like qemu & libguestfs. But default , it will be set to 0600 due to security reason.
root@OSCMP-UA:~# dpkg-statoverride --update --add root root 0644 /boot/vmlinuz-$(uname -r)
To make the kernel readable for future updates, create a file like below & make it executable.
root@OSCMP-UA:~# cat /etc/kernel/postinst.d/statoverride
#!/bin/sh
version="$1"
# passing the kernel version is required
[ -z "${version}" ] && exit 0
dpkg-statoverride --update --add root root 0644 /boot/vmlinuz-${version}
root@OSCMP-UA:~#
root@OSCMP-UA:~# chmod +x /etc/kernel/postinst.d/statoverride
3.Edit the /etc/nova/nova/conf file like below.
Under [DEFAULT] ,
#Glance Node glance_host = OSCTRL-UA #VNC my_ip = 192.168.203.131 vnc_enabled = True vncserver_listen = 0.0.0.0 vncserver_proxyclient_address = 192.168.203.131 novncproxy_base_url = http://OSCTRL-UA:6080/vnc_auto.html #Provide the MQ details rpc_backend = rabbit rabbit_host = OSCTRL-UA rabbit_password = rabbit123 #Nova service to use keystone as auth service auth_strategy = keystone [keystone_authtoken] auth_uri = http://OSCTRL-UA:5000 auth_host = OSCTRL-UA auth_port = 35357 auth_protocol = http admin_tenant_name = service admin_user = nova admin_password = nova123 #Proivde the DB location [database] connection = mysql://nova:novadb123@OSCTRL-UA/nova
4. Run the command below to check whether your compute node supports KVM or not. If the value returned as greater than zero , it supports KVM and doesn’t require any configuration changes.
root@OSCMP-UA:~# egrep -c '(vmx|svm)' /proc/cpuinfo 0 root@OSCMP-UA:~#
As per output above , our compute node doesn’t support KVM. Therefore , we will use qemu.
Set “virt_type=qemu” in libvirt.conf like below.
root@OSCMP-UA:~# cat /etc/nova/nova-compute.conf [DEFAULT] compute_driver=libvirt.LibvirtDriver [libvirt] virt_type=kvm root@OSCMP-UA:~# vi /etc/nova/nova-compute.conf root@OSCMP-UA:~# cat /etc/nova/nova-compute.conf [DEFAULT] compute_driver=libvirt.LibvirtDriver [libvirt] virt_type=qemu root@OSCMP-UA:~#
5.Remove the default test database in the compute node.
root@OSCMP-UA:~# rm /var/lib/nova/nova.sqlite root@OSCMP-UA:~#
6. Restart the compute service.
root@OSCMP-UA:~# service nova-compute restart nova-compute stop/waiting nova-compute start/running, process 14735 root@OSCMP-UA:~# tail -f /var/log/nova/nova-compute.log 2015-09-28 05:15:28.996 14696 TRACE oslo.messaging._drivers.impl_rabbit 2015-09-28 05:15:29.006 14696 INFO oslo.messaging._drivers.impl_rabbit [req-37a1f7ee-29fb-4f12-9954-0626f71105d3 ] Delaying reconnect for 1.0 seconds... 2015-09-28 05:15:30.011 14696 INFO oslo.messaging._drivers.impl_rabbit [req-37a1f7ee-29fb-4f12-9954-0626f71105d3 ] Connecting to AMQP server on OSCTRL-UA:5672 2015-09-28 05:15:30.037 14696 INFO oslo.messaging._drivers.impl_rabbit [req-37a1f7ee-29fb-4f12-9954-0626f71105d3 ] Connected to AMQP server on OSCTRL-UA:5672 2015-09-28 05:15:54.794 14735 INFO nova.virt.driver [-] Loading compute driver 'libvirt.LibvirtDriver' 2015-09-28 05:15:54.799 14735 INFO nova.openstack.common.periodic_task [-] Skipping periodic task _periodic_update_dns because its interval is negative 2015-09-28 05:15:54.823 14735 INFO oslo.messaging._drivers.impl_rabbit [req-521a020c-9a70-4382-8f31-9d2b54f2830f ] Connecting to AMQP server on OSCTRL-UA:5672 2015-09-28 05:15:54.834 14735 INFO oslo.messaging._drivers.impl_rabbit [req-521a020c-9a70-4382-8f31-9d2b54f2830f ] Connected to AMQP server on OSCTRL-UA:5672 2015-09-28 05:15:54.838 14735 INFO oslo.messaging._drivers.impl_rabbit [req-521a020c-9a70-4382-8f31-9d2b54f2830f ] Connecting to AMQP server on OSCTRL-UA:5672 2015-09-28 05:15:54.846 14735 INFO oslo.messaging._drivers.impl_rabbit [req-521a020c-9a70-4382-8f31-9d2b54f2830f ] Connected to AMQP server on OSCTRL-UA:5672
Verify the compute configuration:
1. Login to controller node and check the nova services.
root@OSCTRL-UA:~# nova service-list +----+------------------+-----------+----------+---------+-------+----------------------------+-----------------+ | Id | Binary | Host | Zone | Status | State | Updated_at | Disabled Reason | +----+------------------+-----------+----------+---------+-------+----------------------------+-----------------+ | 1 | nova-cert | OSCTRL-UA | internal | enabled | up | 2015-09-28T01:33:15.000000 | - | | 2 | nova-consoleauth | OSCTRL-UA | internal | enabled | up | 2015-09-28T01:33:16.000000 | - | | 3 | nova-scheduler | OSCTRL-UA | internal | enabled | up | 2015-09-28T01:33:16.000000 | - | | 4 | nova-conductor | OSCTRL-UA | internal | enabled | up | 2015-09-28T01:33:16.000000 | - | | 5 | nova-compute | OSCMP-UA | nova | enabled | up | 2015-09-28T01:33:11.000000 | - | +----+------------------+-----------+----------+---------+-------+----------------------------+-----------------+ root@OSCTRL-UA:~#
We have successfully configured the compute service.
If you are getting output like below (State=down), there must be some misconfiguration in nova.conf on controller node or compute node. You need to re-validate the [default] tab entries.
root@OSCTRL-UA:~# nova service-list +----+------------------+-----------+----------+---------+-------+------------+-----------------+ | Id | Binary | Host | Zone | Status | State | Updated_at | Disabled Reason | +----+------------------+-----------+----------+---------+-------+------------+-----------------+ | 1 | nova-cert | OSCTRL-UA | internal | enabled | down | - | - | | 2 | nova-consoleauth | OSCTRL-UA | internal | enabled | down | - | - | | 3 | nova-scheduler | OSCTRL-UA | internal | enabled | down | - | - | | 4 | nova-conductor | OSCTRL-UA | internal | enabled | down | - | - | +----+------------------+-----------+----------+---------+-------+------------+-----------------+ root@OSCTRL-UA:~#
In compute node, you will get message like below:
# tail -f /var/log/nova/nova-compute.log
2015-09-28 05:15:28.993 14696 WARNING nova.conductor.api [req-37a1f7ee-29fb-4f12-9954-0626f71105d3 None] Timed out waiting for nova-conductor. Is it running? Or did this service start before nova-conductor? Reattempting establishment of nova-conductor connection…
2015-09-28 05:15:28.996 14696 ERROR oslo.messaging._drivers.impl_rabbit [req-37a1f7ee-29fb-4f12-9954-0626f71105d3 ] Failed to publish message to topic ‘conductor’: [Errno 104] Connection reset by peer
Nova configuration should looks like below. ( [DEFAULT] , [database] , [keystone_authtoken] elements)
root@OSCMP-UA:~# egrep -i "default|database|keystone_" -A35 /etc/nova/nova.conf [DEFAULT] dhcpbridge_flagfile=/etc/nova/nova.conf dhcpbridge=/usr/bin/nova-dhcpbridge logdir=/var/log/nova state_path=/var/lib/nova lock_path=/var/lock/nova force_dhcp_release=True libvirt_use_virtio_for_bridges=True verbose=True ec2_private_dns_show_ip=True api_paste_config=/etc/nova/api-paste.ini enabled_apis=ec2,osapi_compute,metadata #Glance Node glance_host = OSCTRL-UA #VNC my_ip = 192.168.203.131 vnc_enabled = True vncserver_listen = 0.0.0.0 vncserver_proxyclient_address = 192.168.203.131 novncproxy_base_url = http://OSCTRL-UA:6080/vnc_auto.html #Nova service to use keystone as auth service auth_strategy = keystone #Provide the MQ details rpc_backend = rabbit rabbit_host = OSCTRL-UA rabbit_password = rabbit123 #Proivde the DB location [database] connection = mysql://nova:novadb123@OSCTRL-UA/nova [keystone_authtoken] auth_uri = http://OSCTRL-UA:5000 auth_host = OSCTRL-UA auth_port = 35357 auth_protocol = http admin_tenant_name = service admin_user = nova admin_password = nova123 root@OSCMP-UA:~#
Hope this article is informative to you.
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obfuscatu says
I removed /var/lib/nova/nova.sqlite but is recreated
obfuscatu says
can’t start nova-scheduler and nova-cert: attempt to write readonly database !