OpenStack-T版——Nova计算服务

一、Nova计算服务简介

1.什么是Nova?

• 计算服务是openstack最核心的服务之一，负责维护和管理云环境的计算资源，它在openstack项目中代号是nova。

• Nova自身并没有提供任何虚拟化能力（是openstack中唯一一个与底层KVM进行对接，调用虚拟化组件，供给openstack中实例以及其他需要底层硬件资源的这些组件进行正常运作），它提供计算服务，使用不同的虚拟化驱动来与底层支持的Hypervisor（虚拟机管理器）进行交互。所有的计算实例（虚拟服务器）由Nova进行生命周期的调度管理（启动、挂起、停止、删除等）（nova控制管理实例的生命周期）

• Nova需要keystone、glance、neutron、cinder和swift等其他服务的支持，能与这些服务集成（调用其他组件），实现如加密磁盘、裸金属计算实例等。

2.组件有哪些？

• DB:用于数据存储的sql数据库。（数据包含nova内部所有组件互相调用，数据读取，传输的一系列过程的数据库）

• API:用于接收HTTP请求、转换命令、通过消息队列或HTTP与其他组件通信的nova组件。

• Scheduler:用于决定哪台计算节点承载计算实例的nova调度器。（内部调度算法进行打分，优先创建实例在分数较高的后端节点上）

• Network:管理IP转发、网桥或虚拟局域网的nova网络组件。

• Compute:管理虚拟机管理器与虚拟机之间通信的nova计算组件，负责具体虚拟机的创建。（整体上：nova负责调用创建虚拟机需要的资源传递给虚拟机）
  日志查看：var/log/nova/nova-compute

• Conductor：(调度器)处理需要协调(构建虚拟机或调整虚拟机大小)的请求，或者处理对象转换（根据已授权的需求任务，分发给对应子功能模块。执行具体的操作）

3.Nova调度器的类型

• 随机调度器（chance scheduler）:从所有正常运行nova-compute服务的节点中随机选择

• 过滤器调度器（filter scheduler）:根据指定的过滤条件以及权重选择最佳的计算节点。Filter又称为筛选器(内存使用量越低，权重越大)

• 缓存调度器(caching scheduler):可看作随机调度器的一种特殊类型，在随机调度的基础上将主机资源信息缓存在本地内存（调度器所在的本地）中，然后通过后台的定时任务定时从数据库中获取最新的主机资源信息（同步后端计算节点的方式）

4.过滤器调度器调度过程

主要分二个阶段

• 1.预选：选择出符合条件的并进行打分

• 2.优选：以分数*权重的方式得出最后的总分并排序，最后择优选择

通过指定的过滤器选择满足条件的计算节点，比如内存使用率小于50%，可以使用多个过滤器依次进行过滤。

对过滤之后的主机列表进行权重计算并排序，选择最优的计算节点来创建虚拟机实例。

5. 虚拟机实例化流程

用户可以通过多种方式访问虚拟机的控制台

• Nova-novncproxy守护进程：通过vnc连接访问正在运行的实例提供一个代理，支持浏览器novnc客户端（以web（页面）形式访问虚拟机）

• Nova-spicehtml5proxy守护进程：通过spice连接访问正在运行的实例提供一个代理，支持基于html5浏览器的客户端

• Nova-xvpvncproxy守护进程：通过vnc连接访问正在运行的实例提供一个代理，支持openstack专用的java客户端

• Nova-consoleauth守护进程：负责对访问虚拟机控制台提供用户令牌认证。这个服务必须与控制台代理程序共同使用(提供认证)

二、OpenStack-nova组件部署

2.1 nova组件部署位置

控制节点ct

• nova-api（nova主服务）
• nova-scheduler（nova调度服务）
• nova-conductor（nova数据库服务，提供数据库访问）
• nova-novncproxy（nova的vnc服务，提供实例的控制台）

计算节点c1、c2

• nova-compute（nova计算服务）

2.2 计算节点Nova服务配置

2.2.1 创建nova数据库，并执行授权操作

[root@ct ~]# mysql -uroot -p123456
MariaDB [(none)]> CREATE DATABASE nova_api;
MariaDB [(none)]> CREATE DATABASE nova;
MariaDB [(none)]> CREATE DATABASE nova_cell0;
MariaDB [(none)]> GRANT ALL PRIVILEGES ON nova_api.* TO 'nova'@'localhost' IDENTIFIED BY 'NOVA_DBPASS';
MariaDB [(none)]> GRANT ALL PRIVILEGES ON nova_api.* TO 'nova'@'%' IDENTIFIED BY 'NOVA_DBPASS';
MariaDB [(none)]> GRANT ALL PRIVILEGES ON nova.* TO 'nova'@'localhost' IDENTIFIED BY 'NOVA_DBPASS';
MariaDB [(none)]> GRANT ALL PRIVILEGES ON nova.* TO 'nova'@'%' IDENTIFIED BY 'NOVA_DBPASS';
MariaDB [(none)]> GRANT ALL PRIVILEGES ON nova_cell0.* TO 'nova'@'localhost' IDENTIFIED BY 'NOVA_DBPASS';
MariaDB [(none)]> GRANT ALL PRIVILEGES ON nova_cell0.* TO 'nova'@'%' IDENTIFIED BY 'NOVA_DBPASS';
MariaDB [(none)]> flush privileges;
MariaDB [(none)]> exit

2.2.2 管理Nova用户及服务

• 创建nova用户

[root@ct ~]# openstack user create --domain default --password NOVA_PASS nova
+---------------------+----------------------------------+
| Field               | Value                            |
+---------------------+----------------------------------+
| domain_id           | default                          |
| enabled             | True                             |
| id                  | d3a3e96ec44a47b181dfa0be6de2433d |
| name                | nova                             |
| options             | {
    
    }                               |
| password_expires_at | None                             |
+---------------------+----------------------------------+

#把nova用户添加到service项目，拥有admin权限

[root@ct ~]# openstack role add --project service --user nova admin

• 创建nova服务

[root@ct ~]# openstack service create --name nova --description "OpenStack Compute" compute
+-------------+----------------------------------+
| Field       | Value                            |
+-------------+----------------------------------+
| description | OpenStack Compute                |
| enabled     | True                             |
| id          | 27f6aea1b4b848eb925f81a9632e1ca5 |
| name        | nova                             |
| type        | compute                          |
+-------------+----------------------------------+

• 给Nova服务关联endpoint（端点）

[root@ct ~]# openstack endpoint create --region RegionOne compute public http://ct:8774/v2.1
+--------------+----------------------------------+
| Field        | Value                            |
+--------------+----------------------------------+
| enabled      | True                             |
| id           | 323adb640c5841baace2e3f42209506e |
| interface    | public                           |
| region       | RegionOne                        |
| region_id    | RegionOne                        |
| service_id   | 27f6aea1b4b848eb925f81a9632e1ca5 |
| service_name | nova                             |
| service_type | compute                          |
| url          | http://ct:8774/v2.1              |
+--------------+----------------------------------+
[root@ct ~]# openstack endpoint create --region RegionOne compute internal http://ct:8774/v2.1
+--------------+----------------------------------+
| Field        | Value                            |
+--------------+----------------------------------+
| enabled      | True                             |
| id           | 8a29ef1ed3d545028808332f151430fd |
| interface    | internal                         |
| region       | RegionOne                        |
| region_id    | RegionOne                        |
| service_id   | 27f6aea1b4b848eb925f81a9632e1ca5 |
| service_name | nova                             |
| service_type | compute                          |
| url          | http://ct:8774/v2.1              |
+--------------+----------------------------------+
[root@ct ~]# openstack endpoint create --region RegionOne compute admin http://ct:8774/v2.1
+--------------+----------------------------------+
| Field        | Value                            |
+--------------+----------------------------------+
| enabled      | True                             |
| id           | e9443ac935b1478aa9756fdecb342fed |
| interface    | admin                            |
| region       | RegionOne                        |
| region_id    | RegionOne                        |
| service_id   | 27f6aea1b4b848eb925f81a9632e1ca5 |
| service_name | nova                             |
| service_type | compute                          |
| url          | http://ct:8774/v2.1              |
+--------------+----------------------------------+

• 安装nova组件（nova-api、nova-conductor、nova-novncproxy、nova-scheduler）

[root@ct ~]# yum -y install openstack-nova-api openstack-nova-conductor openstack-nova-novncproxy openstack-nova-scheduler

2.3 修改nova配置文件(nova.conf)

• 修改nova.conf

[root@ct ~]# cp -a /etc/nova/nova.conf{
    
    ,.bak}
[root@ct ~]# grep -Ev '^$|#' /etc/nova/nova.conf.bak > /etc/nova/nova.conf
#修改nova.conf，通过shell脚本来修改更加方便
openstack-config --set /etc/nova/nova.conf DEFAULT enabled_apis osapi_compute,metadata
openstack-config --set /etc/nova/nova.conf DEFAULT my_ip 192.168.1.10 			####修改为 ct的IP（内部IP）
openstack-config --set /etc/nova/nova.conf DEFAULT use_neutron true
openstack-config --set /etc/nova/nova.conf DEFAULT firewall_driver nova.virt.firewall.NoopFirewallDriver
openstack-config --set /etc/nova/nova.conf DEFAULT transport_url rabbit://openstack:RABBIT_PASS@ct
openstack-config --set /etc/nova/nova.conf api_database connection mysql+pymysql://nova:NOVA_DBPASS@ct/nova_api
openstack-config --set /etc/nova/nova.conf database connection mysql+pymysql://nova:NOVA_DBPASS@ct/nova
openstack-config --set /etc/nova/nova.conf placement_database connection mysql+pymysql://placement:PLACEMENT_DBPASS@ct/placement
openstack-config --set /etc/nova/nova.conf api auth_strategy keystone
openstack-config --set /etc/nova/nova.conf keystone_authtoken auth_url http://ct:5000/v3
openstack-config --set /etc/nova/nova.conf keystone_authtoken memcached_servers ct:11211
openstack-config --set /etc/nova/nova.conf keystone_authtoken auth_type password
openstack-config --set /etc/nova/nova.conf keystone_authtoken project_domain_name Default
openstack-config --set /etc/nova/nova.conf keystone_authtoken user_domain_name Default
openstack-config --set /etc/nova/nova.conf keystone_authtoken project_name service
openstack-config --set /etc/nova/nova.conf keystone_authtoken username nova
openstack-config --set /etc/nova/nova.conf keystone_authtoken password NOVA_PASS
openstack-config --set /etc/nova/nova.conf vnc enabled true
openstack-config --set /etc/nova/nova.conf vnc server_listen ' $my_ip'
openstack-config --set /etc/nova/nova.conf vnc server_proxyclient_address ' $my_ip'
openstack-config --set /etc/nova/nova.conf glance api_servers http://ct:9292
openstack-config --set /etc/nova/nova.conf oslo_concurrency lock_path /var/lib/nova/tmp
openstack-config --set /etc/nova/nova.conf placement region_name RegionOne
openstack-config --set /etc/nova/nova.conf placement project_domain_name Default
openstack-config --set /etc/nova/nova.conf placement project_name service
openstack-config --set /etc/nova/nova.conf placement auth_type password
openstack-config --set /etc/nova/nova.conf placement user_domain_name Default
openstack-config --set /etc/nova/nova.conf placement auth_url http://ct:5000/v3
openstack-config --set /etc/nova/nova.conf placement username placement
openstack-config --set /etc/nova/nova.conf placement password PLACEMENT_PASS

• 通过cat命令查看nova.conf配置文件

[root@ct ~]# cat /etc/nova/nova.conf

[DEFAULT]
enabled_apis = osapi_compute,metadata		#指定支持的api类型
my_ip = 192.168.1.10			#定义本地IP
use_neutron = true					#通过neutron获取IP地址
firewall_driver = nova.virt.firewall.NoopFirewallDriver
transport_url = rabbit://openstack:RABBIT_PASS@ct	#指定连接的rabbitmq

[api]
auth_strategy = keystone				#指定使用keystone认证

[api_database]
connection = mysql+pymysql://nova:NOVA_DBPASS@ct/nova_api

[barbican]
[cache]
[cinder]
[compute]
[conductor]
[console]
[consoleauth]
[cors]

[database]
connection = mysql+pymysql://nova:NOVA_DBPASS@ct/nova

[devices]
[ephemeral_storage_encryption]
[filter_scheduler]

[glance]
api_servers = http://ct:9292

[guestfs]
[healthcheck]
[hyperv]
[ironic]
[key_manager]
[keystone]

[keystone_authtoken]				#配置keystone的认证信息
auth_url = http://ct:5000/v3				#到此url去认证
memcached_servers = ct:11211			#memcache数据库地址:端口
auth_type = password
project_domain_name = Default
user_domain_name = Default
project_name = service
username = nova
password = NOVA_PASS

[libvirt]
[metrics]
[mks]
[neutron]
[notifications]
[osapi_v21]

[oslo_concurrency]					#指定锁路径
lock_path = /var/lib/nova/tmp			#锁的作用是创建虚拟机时，在执行某个操作的时候，需要等此步骤执行完后才能执行下一个步骤，不能并行执行，保证操作是一步一步的执行

[oslo_messaging_amqp]
[oslo_messaging_kafka]
[oslo_messaging_notifications]
[oslo_messaging_rabbit]
[oslo_middleware]
[oslo_policy]

[pci]
[placement]
region_name = RegionOne
project_domain_name = Default
project_name = service
auth_type = password
user_domain_name = Default
auth_url = http://ct:5000/v3
username = placement
password = PLACEMENT_PASS

[powervm]
[privsep]
[profiler]
[quota]
[rdp]
[remote_debug]
[scheduler]
[serial_console]
[service_user]
[spice]
[upgrade_levels]
[vault]
[vendordata_dynamic_auth]
[vmware]
[vnc]						#此处如果配置不正确，则连接不上虚拟机的控制台
enabled = true		
server_listen =  $my_ip				#指定vnc的监听地址
server_proxyclient_address =  $my_ip			#server的客户端地址为本机地址；此地址是管理网的地址

[workarounds]
[wsgi]
[xenserver]
[xvp]
[zvm]

[placement_database]
connection = mysql+pymysql://placement:PLACEMENT_DBPASS@ct/placement

2.4 初始化数据库

• 初始化nova_api数据库

[root@ct ~]# su -s /bin/sh -c "nova-manage api_db sync" nova

• 注册cell0数据库；nova服务内部把资源划分到不同的cell中，把计算节点划分到不同的cell中；openstack内部基于cell把计算节点进行逻辑上的分组

[root@ct ~]# su -s /bin/sh -c "nova-manage cell_v2 map_cell0" nova

• 创建cell1单元格

[root@ct ~]# su -s /bin/sh -c "nova-manage cell_v2 create_cell --name=cell1 --verbose" nova
cdfb1ceb-d4fc-4643-ba7c-7ee218f220cf

• 初始化nova数据库；可以通过 /var/log/nova/nova-manage.log 日志判断是否初始化成功

[root@ct ~]# su -s /bin/sh -c "nova-manage db sync" nova
/usr/lib/python2.7/site-packages/pymysql/cursors.py:170: Warning: (1831, u'Duplicate index `block_device_mapping_instance_uuid_virtual_name_device_name_idx`. This is deprecated and will be disallowed in a future release')
  result = self._query(query)
/usr/lib/python2.7/site-packages/pymysql/cursors.py:170: Warning: (1831, u'Duplicate index `uniq_instances0uuid`. This is deprecated and will be disallowed in a future release')
  result = self._query(query)

• 可使用以下命令验证cell0和cell1是否注册成功

[root@ct ~]# su -s /bin/sh -c "nova-manage cell_v2 list_cells" nova  #验证cell0和cell1组件是否注册成功
+-------+--------------------------------------+----------------------------+-----------------------------------------+----------+
|  名称 |                 UUID                 |       Transport URL        |                数据库连接               | Disabled |
+-------+--------------------------------------+----------------------------+-----------------------------------------+----------+
| cell0 | 00000000-0000-0000-0000-000000000000 |           none:/           | mysql+pymysql://nova:****@ct/nova_cell0 |  False   |
| cell1 | cdfb1ceb-d4fc-4643-ba7c-7ee218f220cf | rabbit://openstack:****@ct |    mysql+pymysql://nova:****@ct/nova    |  False   |
+-------+--------------------------------------+----------------------------+-----------------------------------------+----------+

2.5 启动Nova服务

• 设置开机自启动

[root@ct ~]# systemctl enable openstack-nova-api.service openstack-nova-scheduler.service openstack-nova-conductor.service openstack-nova-novncproxy.service

• 开启服务

[root@ct ~]# systemctl start openstack-nova-api.service openstack-nova-scheduler.service openstack-nova-conductor.service openstack-nova-novncproxy.service

• 检查nova服务端口

[root@ct ~]# netstat -tnlup|egrep '8774|8775'
tcp        0      0 0.0.0.0:8775            0.0.0.0:*               LISTEN      75482/python2       
tcp        0      0 0.0.0.0:8774            0.0.0.0:*               LISTEN      75482/python2   

[root@ct ~]# curl http://ct:8774
{
    
    "versions": [{
    
    "status": "SUPPORTED", "updated": "2011-01-21T11:33:21Z", "links": [{
    
    "href": "http://ct:8774/v2/", "rel": "self"}], "min_version": "", "version": "", "id": "v2.0"}, {
    
    "status": "CURRENT", "updated": "2013-07-23T11:33:21Z", "links": [{
    
    "href": "http://ct:8774/v2.1/", "rel": "self"}], "min_version": "2.1", "version": "2.79", "id": "v2.1"}]}

2.6 计算节点配置Nova服务-c1节点

1.安装nova-compute组件

[root@ct ~]# yum -y install openstack-nova-compute

2.修改配置文件

[root@ct ~]# cp -a /etc/nova/nova.conf{
    
    ,.bak}
[root@ct ~]# grep -Ev '^$|#' /etc/nova/nova.conf.bak > /etc/nova/nova.conf
通过shell脚本来修改更加方便
openstack-config --set /etc/nova/nova.conf DEFAULT enabled_apis osapi_compute,metadata
openstack-config --set /etc/nova/nova.conf DEFAULT transport_url rabbit://openstack:RABBIT_PASS@ct
openstack-config --set /etc/nova/nova.conf DEFAULT my_ip 192.168.1.20 	 #修改为对应节点的内部IP 			
openstack-config --set /etc	/nova/nova.conf DEFAULT use_neutron true
openstack-config --set /etc/nova/nova.conf DEFAULT firewall_driver nova.virt.firewall.NoopFirewallDriver
openstack-config --set /etc/nova/nova.conf api auth_strategy keystone
openstack-config --set /etc/nova/nova.conf keystone_authtoken auth_url http://ct:5000/v3
openstack-config --set /etc/nova/nova.conf keystone_authtoken memcached_servers ct:11211
openstack-config --set /etc/nova/nova.conf keystone_authtoken auth_type password
openstack-config --set /etc/nova/nova.conf keystone_authtoken project_domain_name Default
openstack-config --set /etc/nova/nova.conf keystone_authtoken user_domain_name Default
openstack-config --set /etc/nova/nova.conf keystone_authtoken project_name service
openstack-config --set /etc/nova/nova.conf keystone_authtoken username nova
openstack-config --set /etc/nova/nova.conf keystone_authtoken password NOVA_PASS
openstack-config --set /etc/nova/nova.conf vnc enabled true
openstack-config --set /etc/nova/nova.conf vnc server_listen 0.0.0.0
openstack-config --set /etc/nova/nova.conf vnc server_proxyclient_address ' $my_ip'
openstack-config --set /etc/nova/nova.conf vnc novncproxy_base_url http://192.168.1.10:6080/vnc_auto.html
openstack-config --set /etc/nova/nova.conf glance api_servers http://ct:9292
openstack-config --set /etc/nova/nova.conf oslo_concurrency lock_path /var/lib/nova/tmp
openstack-config --set /etc/nova/nova.conf placement region_name RegionOne
openstack-config --set /etc/nova/nova.conf placement project_domain_name Default
openstack-config --set /etc/nova/nova.conf placement project_name service
openstack-config --set /etc/nova/nova.conf placement auth_type password
openstack-config --set /etc/nova/nova.conf placement user_domain_name Default
openstack-config --set /etc/nova/nova.conf placement auth_url http://ct:5000/v3
openstack-config --set /etc/nova/nova.conf placement username placement
openstack-config --set /etc/nova/nova.conf placement password PLACEMENT_PASS
openstack-config --set /etc/nova/nova.conf libvirt virt_type qemu

• 查看配置文件

[root@ct nova]# cat /etc/nova/nova.conf
[DEFAULT]
enabled_apis = osapi_compute,metadata
my_ip = 192.168.1.20
use_neutron = true
firewall_driver = nova.virt.firewall.NoopFirewallDriver
transport_url = rabbit://openstack:RABBIT_PASS@ct
[api]
auth_strategy = keystone
[api_database]
connection = mysql+pymysql://nova:NOVA_DBPASS@ct/nova_api
[barbican]
[cache]
[cinder]
[compute]
[conductor]
[console]
[consoleauth]
[cors]
[database]
connection = mysql+pymysql://nova:NOVA_DBPASS@ct/nova
[devices]
[ephemeral_storage_encryption]
[filter_scheduler]
[glance]
api_servers = http://ct:9292
[guestfs]
[healthcheck]
[hyperv]
[ironic]
[key_manager]
[keystone]
[keystone_authtoken]
auth_url = http://ct:5000/v3
memcached_servers = ct:11211
auth_type = password
project_domain_name = Default
user_domain_name = Default
project_name = service
username = nova
password = NOVA_PASS
[libvirt]
virt_type = qemu
[metrics]
[mks]
[neutron]
[notifications]
[osapi_v21]
[oslo_concurrency]
lock_path = /var/lib/nova/tmp
[oslo_messaging_amqp]
[oslo_messaging_kafka]
[oslo_messaging_notifications]
[oslo_messaging_rabbit]
[oslo_middleware]
[oslo_policy]
[pci]
[placement]
region_name = RegionOne
project_domain_name = Default
project_name = service
auth_type = password
user_domain_name = Default
auth_url = http://ct:5000/v3
username = placement
password = PLACEMENT_PASS
[powervm]
[privsep]
[profiler]
[quota]
[rdp]
[remote_debug]
[scheduler]
[serial_console]
[service_user]
[spice]
[upgrade_levels]
[vault]
[vendordata_dynamic_auth]
[vmware]
[vnc]
enabled = true
server_listen =  0.0.0.0
server_proxyclient_address =   $my_ip
novncproxy_base_url = http://192.168.1.10:6080/vnc_auto.html
[workarounds]
[wsgi]
[xenserver]
[xvp]
[zvm]
[placement_database]
connection = mysql+pymysql://placement:PLACEMENT_DBPASS@ct/placement

3.开启服务

[root@ct ~]# systemctl enable libvirtd.service openstack-nova-compute.service
[root@ct ~]# systemctl start libvirtd.service openstack-nova-compute.service

4.计算节点-C2配置

除IP地址外，其余的配置与C1相同

5.ct节点操作

• 查看compute节点是否注册到controller上，通过消息队列；需要在controller节点执行

[root@ct ~]# openstack compute service list --service nova-compute
+----+--------------+------+------+---------+-------+----------------------------+
| ID | Binary       | Host | Zone | Status  | State | Updated At                 |
+----+--------------+------+------+---------+-------+----------------------------+
|  6 | nova-compute | ct   | nova | enabled | up    | 2021-03-03T17:15:53.000000 |
+----+--------------+------+------+---------+-------+----------------------------+

• 扫描当前openstack中有哪些计算节点可用，发现后会把计算节点创建到cell中，后面就可以在cell中创建虚拟机；相当于openstack内部对计算节点进行分组，把计算节点分配到不同的cell中

[root@ct ~]# su -s /bin/sh -c "nova-manage cell_v2 discover_hosts --verbose" nova
Found 2 cell mappings.
Skipping cell0 since it does not contain hosts.
Getting computes from cell 'cell1': 53368ac2-6bc2-45dc-859d-f2cd0cb88fb5
Checking host mapping for compute host 'c2': 06404ede-d63d-488c-9cf0-7d6a48cc962c
Creating host mapping for compute host 'c2': 06404ede-d63d-488c-9cf0-7d6a48cc962c
Checking host mapping for compute host 'c1': b04544a9-c617-4848-beb9-f79f0b1f39e2
Creating host mapping for compute host 'c1': b04544a9-c617-4848-beb9-f79f0b1f39e2
Found 2 unmapped computes in cell: 53368ac2-6bc2-45dc-859d-f2cd0cb88fb5

• 默认每次添加个计算节点，在控制端就需要执行一次扫描，这样会很麻烦，所以可以修改控制端nova的主配置文件

[root@ct ~]# vim /etc/nova/nova.conf
[scheduler]
discover_hosts_in_cells_interval = 300			#每300秒扫描一次

[root@ct ~]# systemctl restart openstack-nova-api.service

• 验证计算节点服务

#检查 nova 的各个服务是否都是正常，以及 compute 服务是否注册成功

[root@ct ~]# openstack compute service list

• 查看各个组件的 api 是否正常

[root@ct ~]# openstack catalog list
+-----------+-----------+---------------------------------+
| Name      | Type      | Endpoints                       |
+-----------+-----------+---------------------------------+
| keystone  | identity  | RegionOne                       |
|           |           |   public: http://ct:5000/v3/    |
|           |           | RegionOne                       |
|           |           |   admin: http://ct:5000/v3/     |
|           |           | RegionOne                       |
|           |           |   internal: http://ct:5000/v3/  |
|           |           |                                 |
| nova      | compute   | RegionOne                       |
|           |           |   public: http://ct:8774/v2.1   |
|           |           | RegionOne                       |
|           |           |   internal: http://ct:8774/v2.1 |
|           |           | RegionOne                       |
|           |           |   admin: http://ct:8774/v2.1    |
|           |           |                                 |
| glance    | image     | RegionOne                       |
|           |           |   public: http://ct:9292        |
|           |           | RegionOne                       |
|           |           |   admin: http://ct:9292         |
|           |           | RegionOne                       |
|           |           |   internal: http://ct:9292      |
|           |           |                                 |
| placement | placement | RegionOne                       |
|           |           |   internal: http://ct:8778      |
|           |           | RegionOne                       |
|           |           |   admin: http://ct:8778         |
|           |           | RegionOne                       |
|           |           |   public: http://ct:8778        |
|           |           |                                 |
+-----------+-----------+---------------------------------+

• 查看是否能够拿到镜像

[root@ct ~]# openstack image list
+--------------------------------------+--------+--------+
| ID                                   | Name   | Status |
+--------------------------------------+--------+--------+
| 16bb5f76-4c7d-42b1-b16c-ce005b408bdd | cirros | active |
+--------------------------------------+--------+--------+

• 查看cell的api和placement的api是否正常，只要其中一个有误，后期无法创建虚拟机

[root@ct ~]# nova-status upgrade check
+--------------------------------+
| Upgrade Check Results          |
+--------------------------------+
| Check: Cells v2                |
| Result: Success                |
| Details: None                  |
+--------------------------------+
| Check: Placement API           |
| Result: Success                |
| Details: None                  |
+--------------------------------+
| Check: Ironic Flavor Migration |
| Result: Success                |
| Details: None                  |
+--------------------------------+
| Check: Cinder API              |
| Result: Success                |
| Details: None                  |
+--------------------------------+

六、总结

• Nova分为控制节点、计算节点
• Nova组件核心功能是调度资源，在配置文件中需要体现的部分：指向认证节点位置(URL、ENDPOINT)、调用服务、注册、提供支持等，配置文件中的所有配置参数基本都是围绕此范围(对实例生命周期管理）进行设置