CentOS 7
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OpenStack Juno : Add Compute Nodes
2015/01/09
 
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 RDO, EPEL

[root@node01 ~]#
yum --enablerepo=openstack-juno,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]
# RabbitMQ server's hostname or IP

rabbit_host=10.0.0.30
rabbit_port=5672
# RabbitMQ server's user for auth

rabbit_userid=guest
# RabbitMQ server's password of above user for auth

rabbit_password=password
notification_driver=nova.openstack.common.notifier.rpc_notifier
rpc_backend=rabbit
# 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
# Glance server's hostname or IP

glance_host=10.0.0.30
glance_port=9292
glance_protocol=http
lock_path=/var/lib/nova/tmp
log_dir=/var/log/nova
# Memcached server's hostname or IP

memcached_servers=10.0.0.30:11211
scheduler_driver=nova.scheduler.filter_scheduler.FilterScheduler
[database]
# connection info for MariaDB

connection=mysql://nova:password@10.0.0.30/nova
[keystone_authtoken]
# Keystone server's hostname or IP

auth_host=10.0.0.30
auth_port=35357
auth_protocol=http
auth_version=v2.0
admin_user=nova
# Nova user's password added in Keystone

admin_password=servicepassword
admin_tenant_name=service
signing_dir=/var/lib/nova/keystone-signing
[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@dlp ~]#
cat > /etc/sysconfig/network-scripts/ifcfg-dummy0 <<EOF
DEVICE=dummy0
BOOTPROTO=none
ONBOOT=yes
TYPE=Ethernet
NM_CONTROLLED=no
EOF
[root@dlp ~]#
echo "alias dummy0 dummy" > /etc/modprobe.d/dummy.conf

[root@dlp ~]#
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-conductor   dlp.srv.world       internal         enabled    :-)   2015-01-09 12:00:23
nova-scheduler   dlp.srv.world       internal         enabled    :-)   2015-01-09 12:00:23
nova-cert        dlp.srv.world       internal         enabled    :-)   2015-01-09 12:00:23
nova-consoleauth dlp.srv.world       internal         enabled    :-)   2015-01-09 12:00:23
nova-compute     dlp.srv.world       nova             enabled    :-)   2015-01-09 12:00:16
nova-network     dlp.srv.world       internal         enabled    :-)   2015-01-09 12:00:19
nova-compute     node01.srv.world    nova             enabled    :-)   2015-01-09 12:00:22
nova-network     node01.srv.world    internal         enabled    :-)   2015-01-09 12:00:22
 
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