OpenStack Ansible Inventory机制

2016-03-14

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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.ymlopenstack_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 |
+-------------------------------------+----------+------------------+---------------+----------------+------------------+--------------------+

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