CentOS 7
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OpenStack Mitaka : Add Compute Nodes2016/04/13
 
Add Compute Nodes to run more instances.
[1]
Install KVM Hypervisor first which needs on Compute Node.
It's unnecessarry to set Bridge networking on the section [2] of the link.
[2] Install Nova-Compute, Nova-Network.
If you use Neutron Networking, it's unnecessarry to include "openstack-nova-network" below.
# install from Mitaka, EPEL

[root@node01 ~]#
yum --enablerepo=centos-openstack-mitaka,epel -y install openstack-nova-compute openstack-nova-api openstack-nova-network
[3] Configure Nova.
[root@node01 ~]#
mv /etc/nova/nova.conf /etc/nova/nova.conf.org

[root@node01 ~]#
vi /etc/nova/nova.conf
# create new

[DEFAULT]
# define own IP address

my_ip = 10.0.0.51
state_path = /var/lib/nova
enabled_apis = osapi_compute,metadata
osapi_compute_listen = 0.0.0.0
osapi_compute_listen_port = 8774
rootwrap_config = /etc/nova/rootwrap.conf
api_paste_config = /etc/nova/api-paste.ini
auth_strategy = keystone
log_dir = /var/log/nova
rpc_backend = rabbit
# enable VNC

[vnc]
enabled = True
vncserver_listen = 0.0.0.0
vncserver_proxyclient_address = $my_ip
novncproxy_base_url = http://10.0.0.30:6080/vnc_auto.html
# specify Glance server

[glance]
api_servers = http://10.0.0.30:9292
[oslo_concurrency]
lock_path = /var/lib/nova/tmp
# RabbitMQ server connection info

[oslo_messaging_rabbit]
rabbit_host = 10.0.0.30
rabbit_port = 5672
rabbit_userid = openstack
rabbit_password = password
# Keystone server auth info

[keystone_authtoken]
auth_uri = http://10.0.0.30:5000
auth_url = http://10.0.0.30:35357
memcached_servers = 10.0.0.30:11211
auth_type = password
project_domain_name = default
user_domain_name = default
project_name = service
username = nova
password = servicepassword
[root@node01 ~]#
chmod 640 /etc/nova/nova.conf

[root@node01 ~]#
chgrp nova /etc/nova/nova.conf

[4] Configure Networking.
The follows is for the case you use legacy nova-network function.
But if you use Neutron Networking function, Refer to here to configure it.
Anyway, legacy nova-network function is officially not recommended.
[root@node01 ~]#
vi /etc/nova/nova.conf
# add follows in [DEFAULT] section

use_neutron = False
libvirt_vif_driver = nova.virt.libvirt.vif.LibvirtGenericVIFDriver
linuxnet_interface_driver = nova.network.linux_net.LinuxBridgeInterfaceDriver
firewall_driver = nova.virt.libvirt.firewall.IptablesFirewallDriver
network_manager = nova.network.manager.FlatDHCPManager
network_size = 254
allow_same_net_traffic = False
multi_host = True
send_arp_for_ha = True
share_dhcp_address = True
force_dhcp_release = True
# specify nic for public

public_interface = eno16777736
# specify any name for bridge

flat_network_bridge = br100
# specify nic for flat DHCP bridge

flat_interface = dummy0
# add a dummy interface which is for the flat DHCP bridge

[root@node01 ~]#
cat > /etc/sysconfig/network-scripts/ifcfg-dummy0 <<EOF
DEVICE=dummy0
BOOTPROTO=none
ONBOOT=yes
TYPE=Ethernet
NM_CONTROLLED=no
EOF
[root@node01 ~]#
echo "alias dummy0 dummy" > /etc/modprobe.d/dummy.conf

[root@node01 ~]#
ifup dummy0

[5] Start Nova Services.
If you don't use legacy nova-network, exclude the word "network" below.
[root@node01 ~]#
for service in metadata-api compute network; do
systemctl start openstack-nova-$service
systemctl enable openstack-nova-$service
done
[6] Make sure the status of Nova services on Controle Node like here. If all State is "up", they are running normally.
[root@dlp ~(keystone)]#
nova service-list 

+----+------------------+---------------------+----------+---------+-------+----------------------------+-----------------+
| Id | Binary           | Host                | Zone     | Status  | State | Updated_at                 | Disabled Reason |
+----+------------------+---------------------+----------+---------+-------+----------------------------+-----------------+
| 5  | nova-cert        | dlp.srv.world       | internal | enabled | up    | 2016-04-13T11:27:54.000000 | -               |
| 6  | nova-consoleauth | dlp.srv.world       | internal | enabled | up    | 2016-04-13T11:27:51.000000 | -               |
| 7  | nova-conductor   | dlp.srv.world       | internal | enabled | up    | 2016-04-13T11:27:51.000000 | -               |
| 9  | nova-scheduler   | dlp.srv.world       | internal | enabled | up    | 2016-04-13T11:27:51.000000 | -               |
| 10 | nova-compute     | dlp.srv.world       | nova     | enabled | up    | 2016-04-13T11:27:54.000000 | -               |
| 11 | nova-network     | dlp.srv.world       | internal | enabled | up    | 2016-04-13T11:27:54.000000 | -               |
| 12 | nova-compute     | node01.srv.world    | nova     | enabled | up    | 2016-04-13T11:27:56.000000 | -               |
| 13 | nova-network     | node01.srv.world    | internal | enabled | up    | 2016-04-13T11:27:51.000000 | -               |
+----+------------------+---------------------+----------+---------+-------+----------------------------+-----------------+
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