CentOS 7
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OpenStack Liberty : Add Compute Nodes2015/11/15
 
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 Liberty, EPEL

[root@node01 ~]#
yum --enablerepo=centos-openstack-liberty,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]
# own IP address

my_ip=10.0.0.51
# add if it's not need IPv6

use_ipv6=false
state_path=/var/lib/nova
enabled_apis=ec2,osapi_compute,metadata
osapi_compute_listen=0.0.0.0
osapi_compute_listen_port=8774
rootwrap_config=/etc/nova/rootwrap.conf
api_paste_config=api-paste.ini
auth_strategy=keystone
log_dir=/var/log/nova
# specify Memcached server

memcached_servers=10.0.0.30:11211
scheduler_driver=nova.scheduler.filter_scheduler.FilterScheduler
notification_driver=nova.openstack.common.notifier.rpc_notifier
rpc_backend=rabbit
# Glance server connection info

[glance]
host=10.0.0.30
port=9292
protocol=http
[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=guest
rabbit_password=password
# MariaDB server connection info

[database]
connection=mysql://nova:password@10.0.0.30/nova
# Keystone server connection info

[keystone_authtoken]
auth_uri=http://10.0.0.30:5000
auth_url=http://10.0.0.30:35357
auth_plugin=password
project_domain_id=default
user_domain_id=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

network_driver=nova.network.linux_net
libvirt_vif_driver=nova.virt.libvirt.vif.LibvirtGenericVIFDriver
linuxnet_interface_driver=nova.network.linux_net.LinuxBridgeInterfaceDriver
firewall_driver=nova.virt.libvirt.firewall.IptablesFirewallDriver
network_api_class=nova.network.api.API
security_group_api=nova
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
# Nova API server's hostname or IP address

metadata_host=10.0.0.30
# 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 Service.
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
# show status

[root@node01 ~]#
nova-manage service list 

Binary           Host                    Zone          Status     State Updated_At
nova-cert        dlp.srv.world        internal      enabled    :-)   2015-11-14 12:59:50
nova-consoleauth dlp.srv.world        internal      enabled    :-)   2015-11-14 12:59:52
nova-conductor   dlp.srv.world        internal      enabled    :-)   2015-11-14 12:59:54
nova-scheduler   dlp.srv.world        internal      enabled    :-)   2015-11-14 12:59:50
nova-compute     dlp.srv.world        nova          enabled    :-)   2015-11-14 12:59:50
nova-network     dlp.srv.world        internal      enabled    :-)   2015-11-14 12:59:52
nova-compute     node01.srv.world     nova          enabled    :-)   2015-11-14 12:59:51
nova-network     node01.srv.world     internal      enabled    :-)   2015-11-14 12:59:54
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