用于创建虚拟机的节点；
0、配置openstack版本yum源：
yum install centos-release-openstack-rocky
1、nova-compute的安装；
（1）安装包：
yum install openstack-nova-compute
（2）编辑配置文件：
计算节点的/etc/nova/nova.conf配置文件和控制节点的配置文件比较相似，只要改变
部分配置即可：
1）将控制节点的配置拷贝到计算节点上：
scp -P22 /etc/nova/nova.conf root@172.16.1.12:/etc/nova/
chown -R root.nova /etc/nova/nova.conf
ls -l /etc/nova/nova.conf
-rw-r----- 1 root nova 389725 3月 29 23:59 /etc/nova/nova.conf
2）修改：
vim /etc/nova/nova.conf
[DEFAULT]
enabled_apis = osapi_compute,metadata
#启用计算和元数据的api；
transport_url = rabbit://openstack:openstack@controller
#启用RabbitMQ消息队列；
use_neutron = true
#启用neutron管理网络；
firewall_driver = nova.virt.firewall.NoopFirewallDriver
#关闭nova的防火墙使用neutron的防火墙；
[api_database]
#connection = mysql+pymysql://nova:nova@controller/nova_api
[database]
#connection = mysql+pymysql://nova:nova@controller/nova
[placement_database]
#connection = mysql+pymysql://placement:placement@controller/placement
#配置数据库；
#删除配置的数据库，由控制节点连接数据库；
[api]
auth_strategy = keystone
[keystone_authtoken]
auth_url = http://controller:5000/v3
memcached_servers = controller:11211
auth_type = password
project_domain_name = default
user_domain_name = default
project_name = service
username = nova
password = nova
#配置身份服务访问；
[vnc]
enabled = true
server_listen = 0.0.0.0
#vnc监听的网卡；
server_proxyclient_address = compute1
#vnc_proxy使用;
#vnc需要配置为本地；
novncproxy_base_url = http://controller:6080/vnc_auto.html
#URL指示您可以使用Web浏览器访问此计算节点上的实例的远程控制台的位置；
[glance]
api_servers = http://controller:9292
#配置glance；
[oslo_concurrency]
lock_path = /var/lib/nova/tmp
#锁路径；
[placement]
region_name = RegionOne
project_domain_name = Default
project_name = service
auth_type = password
user_domain_name = Default
auth_url = http://controller:5000/v3
username = placement
password = placement
[libvirt]
virt_type = qemu
#egrep -c '(vmx|svm)' /proc/cpuinfo
#如果返回的结果为0，说明该机器不支持
#虚拟化，使用的参数是virt_type = qemu
#特别注意：在虚拟机的环境下，虽然开机了虚拟化但是还是创建不
#了虚拟你，需要改为qemu;
（3）将服务加入到开机自启动并开启服务：
systemctl enable libvirtd.service openstack-nova-compute.service
systemctl start libvirtd.service openstack-nova-compute.service
（4）将计算节点添加到控制节点的单元数据库(很重要)：
openstack compute service list --service nova-compute
+----+--------------+----------+------+---------+-------+----------------------------+
| ID | Binary | Host | Zone | Status | State | Updated At |
+----+--------------+----------+------+---------+-------+----------------------------+
| 6 | nova-compute | compute1 | nova | enabled | up | 2019-03-29T16:11:03.000000 |
+----+--------------+----------+------+---------+-------+----------------------------+
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': e92cce3a-5fee-4e90-b7fe-1ef7fdfa6c69
Checking host mapping for compute host 'compute1': 36976a76-bf81-4300-900c-b4b0abbb573b
Creating host mapping for compute host 'compute1': 36976a76-bf81-4300-900c-b4b0abbb573b
Found 1 unmapped computes in cell: e92cce3a-5fee-4e90-b7fe-1ef7fdfa6c69
openstack image list
+--------------------------------------+--------+--------+
| ID | Name | Status |
+--------------------------------------+--------+--------+
| a036ec33-6df8-45ec-adbe-4b0ac189dc8c | cirros | active |
+--------------------------------------+--------+--------+
说明： 计算节点的主机名必需唯一，且在计算节点在控制节点注册后就不能再改计算节点的主机名，否则控制节点
会把改名的计算当做一台新的计算节点进行注册；
添加新计算节点时，必须在控制器节点上运行以注册这些新计算节点。或者可以设置适当的间隔；
vim /etc/nova/nova.conf
[scheduler]
discover_hosts_in_cells_interval = 300
2、neutron服务：
（1）安装软件包：
yum install openstack-neutron-linuxbridge ebtables ipset
（2）配置公共组件：
vim /etc/neutron/neutron.conf
[DEFAULT]
transport_url = rabbit://openstack:openstack@controller
#消息队列连接；
auth_strategy = keystone
#身份验证模式；
[keystone_authtoken]
www_authenticate_uri = http://controller:5000
auth_url = http://controller:5000
memcached_servers = controller:11211
auth_type = password
project_domain_name = default
user_domain_name = default
project_name = service
username = neutron
password = neutron
#身份验证；
[oslo_concurrency]
lock_path = /var/lib/neutron/tmp
#锁定路径；
（3）配置网络选项1-提供商网络：
vim /etc/neutron/plugins/ml2/linuxbridge_agent.ini
[linux_bridge]
physical_interface_mappings = provider:eth0
#配置提供物理网络的接口名称；
[vxlan]
enable_vxlan = false
#禁用vxlan重叠网络；
[securitygroup]
enable_security_group = true
firewall_driver = neutron.agent.linux.iptables_firewall.IptablesFirewallDriver
#启用安全组，并配置linux网桥iptables防火墙驱动程序；
以下参数在启动neutron-linuxbridge-agent.service的时候会自动设置为1，以确保
linux内核支持网桥过滤器;
sysctl net.bridge.bridge-nf-call-iptables
sysctl net.bridge.bridge-nf-call-ip6tables
（4）配置Compute服务以使用Networking服务：
vim /etc/nova/nova.conf
[neutron]
url = http://controller:9696
auth_url = http://controller:5000
auth_type = password
project_domain_name = default
user_domain_name = default
region_name = RegionOne
project_name = service
username = neutron
password = neutron
（5）重启compute服务：
systemctl restart openstack-nova-compute.service
（6）启动Linux网桥代理并将其配置为在系统引导时启动：
systemctl enable neutron-linuxbridge-agent.service
systemctl start neutron-linuxbridge-agent.service
（7）验证：
在控制节点进行验证：
openstack network agent list
+--------------------------------------+--------------------+------------+-------------------+-------+-------+---------------------------+
| ID | Agent Type | Host | Availability Zone | Alive | State | Binary |
+--------------------------------------+--------------------+------------+-------------------+-------+-------+---------------------------+
| 1210dc27-0620-49d4-850e-2d3c86cf6a43 | DHCP agent | controller | nova | :-) | UP | neutron-dhcp-agent |
| 2aed088c-e3a4-4714-a63d-3056eabddafa | Linux bridge agent | controller | None | :-) | UP | neutron-linuxbridge-agent |
| 2ccc602e-29d4-46b2-a501-19a17a6a9b8f | Metadata agent | controller | None | :-) | UP | neutron-metadata-agent |
| 7021bdb8-e775-4c88-8976-06c1549f0440 | Linux bridge agent | compute1 | None | :-) | UP | neutron-linuxbridge-agent |
+--------------------------------------+--------------------+------------+-------------------+-------+-------+---------------------------+
openstack compute service list
+----+------------------+------------+----------+---------+-------+----------------------------+
| ID | Binary | Host | Zone | Status | State | Updated At |
+----+------------------+------------+----------+---------+-------+----------------------------+
| 1 | nova-consoleauth | controller | internal | enabled | up | 2019-03-30T09:56:26.000000 |
| 2 | nova-conductor | controller | internal | enabled | up | 2019-03-30T09:56:31.000000 |
| 3 | nova-scheduler | controller | internal | enabled | up | 2019-03-30T09:56:25.000000 |
| 6 | nova-compute | compute1 | nova | enabled | up | 2019-03-30T09:56:26.000000 |
+----+------------------+------------+----------+---------+-------+----------------------------+