原文链接 https://lingxiankong.github.io/2016-03-14-openstack-ansible-inventory.html
注：以下为加速网络访问所做的原文缓存，经过重新格式化，可能存在格式方面的问题，或偶有遗漏信息，请以原文为准。
openstack ansible所用到的主机文件(inventory)是动态生成的，关于openstack ansible inventory的机制可以参见这里，该文档中也同时提到了ansible本身的dynamic inventory functionality。
如果需要加一个新的服务，使用openstack-ansible部署，首先碰到的问题是：我需要把该服务部署到哪个host上？服务需要部署到container上么？
假设需求如下：
通过openstack ansible部署mistral服务，mistral服务包含三个服务进程，分别是mistral-api, mistral-engine, mistral-executor，想把这三个进程部署到独立的物理机上。
首先要有一个基本的用户配置文件，一个最简单的openstack_user_config.yml内容如下：
identity_hosts:
infra01:
ip: 10.0.0.10
infra02:
ip: 10.0.0.11
infra03:
ip: 10.0.0.12
cidr_networks:
container: 172.29.236.0/22
global_overrides:
management_bridge: br-mgmt
provider_networks:
- network:
group_binds:
- all_containers
- hosts
type: "raw"
container_bridge: "br-mgmt"
container_interface: "eth1"
container_type: "veth"
ip_from_q: "container"
is_container_address: true
is_ssh_address: true
同时，与之对应的env.d目录下keystone.yml内容如下：
component_skel:
keystone:
belongs_to:
- keystone_all
container_skel:
keystone_container:
belongs_to:
- infra_containers
- identity_containers
contains:
- keystone
properties:
service_name: keystone
container_release: trusty
physical_skel:
identity_containers:
belongs_to:
- all_containers
identity_hosts:
belongs_to:
- hosts
关于mistral，新增两个文件：
在env.d目录下新增mistral.yml，内容如下：
component_skel:
mistral_api:
belongs_to:
- mistral_all
mistral_engine:
belongs_to:
- mistral_all
mistral_executor:
belongs_to:
- mistral_all
container_skel:
mistral_service_container:
belongs_to:
- infra_containers
- workflowengine_containers
contains:
- mistral_api
- mistral_engine
- mistral_executor
properties:
is_metal: true
service_name: mistral
container_release: trusty
physical_skel:
workflowengine_containers:
belongs_to:
- all_containers
workflowengine_hosts:
belongs_to:
- hosts
在conf.d目录下新增mistral.yml，内容如下：
workflowengine_hosts:
infra04:
ip: 10.0.0.13
在playbooks/inventory目录下运行：
$ ./dynamic_inventory.py --config ../../etc/openstack_deploy/
会在openstack_deploy目录下生成两个新的文件：openstack_hostnames_ips.yml和openstack_inventory.json。请自行查看生成的文件内容。
openstack ansible提供了命令行查看inventory的信息，比如（在etc/openstack_deploy/目录下执行）：
$ ../../scripts/inventory-manage.py -l
+-------------------------------------+----------+------------------+---------------+----------------+------------------+--------------------+
| container_name | is_metal | component | physical_host | tunnel_address | ansible_ssh_host | container_types |
+-------------------------------------+----------+------------------+---------------+----------------+------------------+--------------------+
| infra01 | True | None | infra01 | None | 10.0.0.10 | infra01_containers |
| infra02 | True | None | infra02 | None | 10.0.0.11 | infra02_containers |
| infra03 | True | None | infra03 | None | 10.0.0.12 | infra03_containers |
| infra01_keystone_container-78c92f7e | None | keystone | infra01 | None | 172.29.239.95 | None |
| infra02_keystone_container-18ed73e3 | None | keystone | infra02 | None | 172.29.237.9 | None |
| infra03_keystone_container-a8c83914 | None | keystone | infra03 | None | 172.29.237.248 | None |
| infra04 | True | mistral_executor | infra04 | None | 10.0.0.13 | infra04_containers |
+-------------------------------------+----------+------------------+---------------+----------------+------------------+--------------------+