CentOS 7
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OpenStack Pike : Add Compute Nodes
2017/09/03
 
Add Compute Nodes to run more instances.
This example is based on the emvironment like follows. 
     ------------+-----------------------------+------------
                 |                             |
             eth0|10.0.0.30                eth0|10.0.0.51
     +-----------+-----------+     +-----------+-----------+
     |    [ Control Node ]   |     |    [ Compute Node ]   |
     |                       |     |                       |
     |  MariaDB    RabbitMQ  |     |        Libvirt        |
     |  Memcached  httpd     |     |      Nova Compute     |
     |  Keystone   Glance    |     |                       |
     |  Nova API             |     |                       |
     +-----------------------+     +-----------------------+
[1]
Install KVM Hypervisor on Compute Node.
It's unnecessarry to set Bridge networking on the section [2] of the link.
[2] Install Nova-Compute.
# install from Pike, EPEL

[root@node01 ~]#
yum --enablerepo=centos-openstack-pike,epel -y install openstack-nova-compute
[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
log_dir = /var/log/nova
# RabbitMQ connection info
transport_url = rabbit://openstack:password@10.0.0.30

[api]
auth_strategy = keystone

# 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 

# Glance connection info
[glance]
api_servers = http://10.0.0.30:9292

[oslo_concurrency]
lock_path = $state_path/tmp

# Keystone 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

[placement]
auth_url = http://10.0.0.30:35357
os_region_name = RegionOne
auth_type = password
project_domain_name = default
user_domain_name = default
project_name = service
username = placement
password = servicepassword

[wsgi]
api_paste_config = /etc/nova/api-paste.ini
[root@node01 ~]#
chmod 640 /etc/nova/nova.conf

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

[4] If SELinux is enabled, change policy like follows.
[root@node01 ~]#
vi nova-compute_pol.te
# create new

module nova-compute_pol 1.0;

require {
        type nova_t;
        type nova_var_lib_t;
        type nova_log_t;
        type virtlogd_t;
        type sysctl_net_t;
        type netutils_exec_t;
        class file { read append getattr create open execute };
        class dir { write search add_name };
        class capability { dac_override kill sys_ptrace };
        class capability2 block_suspend;
}

#============= nova_t ==============
allow nova_t netutils_exec_t:file execute;
allow nova_t self:capability kill;
allow nova_t sysctl_net_t:dir search;
allow nova_t sysctl_net_t:file { read getattr open };
allow nova_t self:capability sys_ptrace;
allow nova_t self:capability2 block_suspend;

#============= virtlogd_t ==============
allow virtlogd_t nova_var_lib_t:dir search;
allow virtlogd_t nova_var_lib_t:file { append getattr open };
allow virtlogd_t self:capability dac_override;
[root@node01 ~]#
checkmodule -m -M -o nova-compute_pol.mod nova-compute_pol.te

checkmodule: loading policy configuration from nova-compute_pol.te
checkmodule: policy configuration loaded
checkmodule: writing binary representation (version 17) to nova-compute_pol.mod
[root@node01 ~]#
semodule_package --outfile nova-compute_pol.pp --module nova-compute_pol.mod

[root@node01 ~]#
semodule -i nova-compute_pol.pp

[5] If Firewalld is running, allow service ports.
[root@dlp ~(keystone)]#
firewall-cmd --add-port=5900-5999/tcp --permanent

success
[root@dlp ~(keystone)]#
firewall-cmd --reload

success
[6] Start Nova Compute Service.
[root@node01 ~]#
systemctl start openstack-nova-compute

[root@node01 ~]#
systemctl enable openstack-nova-compute

[7] Make sure the status of Nova services on Controle Node like here. If all State is [up], they are running normally.
# discover Compute Nodes

[root@dlp ~(keystone)]#
su -s /bin/bash nova -c "nova-manage cell_v2 discover_hosts"
[root@dlp ~(keystone)]#
openstack compute service list 

+----+------------------+------------------+----------+---------+-------+----------------------------+
| ID | Binary           | Host             | Zone     | Status  | State | Updated At                 |
+----+------------------+------------------+----------+---------+-------+----------------------------+
|  4 | nova-consoleauth | dlp.srv.world    | internal | enabled | up    | 2017-09-04T09:40:20.000000 |
|  5 | nova-conductor   | dlp.srv.world    | internal | enabled | up    | 2017-09-04T09:40:18.000000 |
|  6 | nova-scheduler   | dlp.srv.world    | internal | enabled | up    | 2017-09-04T09:40:18.000000 |
|  7 | nova-compute     | dlp.srv.world    | nova     | enabled | up    | 2017-09-04T09:40:15.000000 |
|  8 | nova-compute     | node01.srv.world | nova     | enabled | up    | 2017-09-04T09:40:19.000000 |
+----+------------------+------------------+----------+---------+-------+----------------------------+
 
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