2.5計算服務
2.5.1Nova的概述
Nova組成組件：
API：負責接收和響應外部請求。支持openstack API，EC2 API
Nova-api組件實現了restful API功能，是外部訪問Nova的唯一途徑
接收外部的請求並通過message queue將請求發送給其他的組件，同事也兼容EC2 API，所以也可以用EC2 的管理工具對Nova進行日常管理。
Cert：負責身份認證EC 2
Schedule：用於雲主機調讀，決策虛擬機創建在哪個主機（計算節點）上。
Conductor：計算節點訪問數據的中間件
Consoleauth：用於控制檯的授權驗證
Novncproxy：VNC代理
Nova-computer一般運行在計算節點上，通過messagequeue接收並管理VM的生命週期。通過libvirt管理KVM，通過xenapi管理xen等。
2.5.2控制節點上Nova的安裝與配置
a數據庫的創建與授權
create databasenova;
grant all on nova.*to 'nova'@'localhost' identified by 'nova';
grant all on nova.*to 'nova'@'%' identified by 'nova';
create databasenova_api;
grant all onnova_api.* to 'nova'@'localhost' identified by 'nova';
grant all onnova_api.* to 'nova'@'%' identified by 'nova';
b創建服務證書
獲得 admin 憑證來獲取只有管理員能執行的命令的訪問權限：
sourceadmin-openstack.sh
創建 nova 用戶：
openstack usercreate --domain default \
--password-promptnova
給 nova 用戶添加admin 角色：
openstack role add--project service --user nova admin
c創建 nova 服務實體
openstack servicecreate --name nova \
--description"OpenStack Compute" compute
d創建 Compute 服務 API 端點
openstack endpointcreate --region RegionOne compute public http://192.168.56.11:8774/v2.1/%\(tenant_id\)s
openstack endpointcreate --region RegionOne compute admin http://192.168.56.11:8774/v2.1/%\(tenant_id\)s
openstack endpointcreate --region RegionOne compute internalhttp://192.168.56.11:8774/v2.1/%\(tenant_id\)s
e軟件包的安裝
yum install -yopenstack-nova-api openstack-nova-conductor \
openstack-nova-consoleopenstack-nova-novncproxy \
openstack-nova-scheduler
f編輯``/etc/nova/nova.conf``
[DEFAULT]#只啓用計算和元數據API
enabled_apis=osapi_compute,metadata
transport_url=rabbit://openstack:[email protected]#配置rabbitmq消息隊列訪問權限
auth_strategy=keystone
firewall_driver =nova.virt.firewall.NoopFirewallDriver #啓用網絡服務支持
use_neutron=True
[api_database]#配置數據庫的連接
connection=mysql+pymysql://nova:[email protected]/nova_api
[database] #配置數據庫的連接
connection=mysql+pymysql://nova:[email protected]/nova
[glance] #配置鏡像服務API的位置
api_servers=http://192.168.56.11:9292
[keystone_authtoken]#配置認證服務訪問
auth_uri =http://192.168.56.11:5000
auth_url =http://192.168.56.11:35357
memcached_servers =192.168.56.11:11211
auth_type =password
project_domain_name= default
user_domain_name =default
project_name =service
username = nova
password = nova
[oslo_concurrency]配置鎖路徑
lock_path=/var/lib/nova/tmp
[vnc]#配置vnc代理使用控制節點的管理接口IP地址
vncserver_listen=0.0.0.0
vncserver_proxyclient_address=192.168.56.11
j同步Compute 數據庫
su -s /bin/sh -c"nova-manage api_db sync" nova
su -s /bin/sh -c"nova-manage db sync" nova
檢驗是否同步成功
mysql -h192.168.56.11 -unova -pnova -e "use nova;show tables;"
mysql -h192.168.56.11 -unova -pnova -e "use nova_api;show tables;"
h啓動 Compute 服務並將其設置爲隨系統啓動
systemctl enableopenstack-nova-api.service \
openstack-nova-consoleauth.serviceopenstack-nova-scheduler.service \
openstack-nova-conductor.serviceopenstack-nova-novncproxy.service
systemctl startopenstack-nova-api.service \
openstack-nova-consoleauth.serviceopenstack-nova-scheduler.service \
openstack-nova-conductor.serviceopenstack-nova-novncproxy.service
驗證：
openstack host list
+-------------------------+-------------+----------+
| Host Name | Service| Zone |
+-------------------------+-------------+----------+
|linux-node1.example.com | consoleauth | internal |
|linux-node1.example.com | conductor | internal |
|linux-node1.example.com | scheduler | internal |
+-------------------------+-------------+----------+
2.5.3計算節點上Nova的安裝與配置
a檢驗是否具備虛擬化功能
egrep -c'(vmx|svm)' /proc/cpuinfo 過來出非零的數字即可
b軟件包安裝
yum install -yopenstack-nova-compute
c編輯``/etc/nova/nova.conf`` [DEFAULT]
[DEFAULT]#只啓用計算和元數據API
auth_strategy=keystone
firewall_driver =nova.virt.firewall.NoopFirewallDriver
use_neutron=True
enabled_apis=osapi_compute,metadata
transport_url=rabbit://openstack:[email protected] #配置``RabbitMQ``消息隊列訪問權限
[api_database]#配置數據庫訪問
connection=mysql+pymysql://nova:[email protected]/nova_api
[database]#配置數據庫訪問
connection=mysql+pymysql://nova:[email protected]/nova
[glance]#配置鏡像服務API
api_servers=http://192.168.56.11:9292
[keystone_authtoken] #配置認證服務
auth_uri =http://192.168.56.11:5000
auth_url =http://192.168.56.11:35357
memcached_servers =192.168.56.11:11211
auth_type =password
project_domain_name= default
user_domain_name =default
project_name =service
username = nova
password = nova
[oslo_concurrency]#配置鎖路徑
lock_path=/var/lib/nova/tmp
[vnc] #啓用並配置遠程控制檯訪問
enabled = True
vncserver_listen=0.0.0.0
vncserver_proxyclient_address=192.168.56.12
novncproxy_base_url=http://192.168.56.11:6080/vnc_auto.html
[libvirt]
virt_type=kvm
d啓動計算服務及其依賴，並將其配置爲隨系統自動啓動
systemctl enablelibvirtd.service openstack-nova-compute.service
systemctl startlibvirtd.service openstack-nova-compute.service
驗證：
獲得 admin 憑證來獲取只有管理員能執行的命令的訪問權限：
sourceadmin-openstack
列出服務組件，以驗證是否成功啓動並註冊了每個進程：
openstack compute servicelist
+----+------------------+-------------------------+----------+---------+-------+----------------------------+
| ID | Binary |Host | Zone | Status | State | Updated At |
+----+------------------+-------------------------+----------+---------+-------+----------------------------+
| 1 |nova-consoleauth | linux-node1.example.com | internal | enabled | up |2016-12-20T08:00:14.000000 |
| 2 |nova-conductor | linux-node1.example.com | internal | enabled | up |2016-12-20T08:00:20.000000 |
| 4 | nova-scheduler| linux-node1.example.com | internal | enabled | up |2016-12-20T08:00:14.000000 |
| 8 | nova-compute| linux-node2.example.com | nova | enabled | up | 2016-12-20T08:00:17.000000 |
+----+------------------+-------------------------+----------+---------+-------+----------------------------+