overcloud 网络配置需要一组网络接口模板。这些模板采用 YAML 格式的标准 heat 模板。每个角色都需要一个 NIC 模板，以便 director 可以正确地配置该角色中的每个节点。
所有 NIC 模板都包含与标准 heat 模板相同的部分：
heat_template_version
要使用的语法版本。
description
模板的字符串描述。
parameters
模板中包含的网络参数。
资源
使用参数 中定义的参数，并将其应用到网络配置脚本。
输出
呈现用于配置的最终脚本。
/usr/share/openstack-tripleo-heat-templates/network/config 中的默认 NIC 模板使用 Jinja2 语法呈现模板。例如，single-nic-vlans 配置中的以下片段为每个网络呈现一组 VLAN：
{%- for network in networks if network.enabled|default(true) and network.name in role.networks %}
- type: vlan
vlan_id:
get_param: {{network.name}}NetworkVlanID
addresses:
- ip_netmask:
get_param: {{network.name}}IpSubnet
{%- if network.name in role.default_route_networks %}
{%- for network in networks if network.enabled|default(true) and network.name in role.networks %}
- type: vlan
vlan_id:
get_param: {{network.name}}NetworkVlanID
addresses:
- ip_netmask:
get_param: {{network.name}}IpSubnet
{%- if network.name in role.default_route_networks %}
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