OpenStackstein安装（四）placement

placement服务提供一个HTTP API，用于跟踪资源提供者清单和使用情况。placement作为数据模型上的web服务进行操作。安装包括创建必要的数据库以及安装和配置web服务。这是一个简单的过程，但是要将placement与OpenStack云的其余部分集成起来，有相当多的步骤。
其他一些OpenStack服务(尤其是nova)需要安装placement，因此应该在其他服务之前安装placement，而在Identity (keystone)之后安装placement。

让客户满意是我们工作的目标，不断超越客户的期望值来自于我们对这个行业的热爱。我们立志把好的技术通过有效、简单的方式提供给客户，将通过不懈努力成为客户在信息化领域值得信任、有价值的长期合作伙伴，公司提供的服务项目有：主机域名、网络空间、营销软件、网站建设、永定网站维护、网站推广。

安装准备

安装配置placement服务之前，建库等。

建立数据库

1. 完成下列建库操作:
    ○ 使用root用户登录:
        $ MySQL -u root -p root123 
    ○ 建立placement database:
        MariaDB [(none)]> CREATE DATABASE placement;
    ○ Grant proper access to the database:
        MariaDB [(none)]> GRANT ALL PRIVILEGES ON placement.* TO 'placement'@'%'  IDENTIFIED BY 'placement123';

2. Configure User and Endpoints
    1. Source the admin credentials to gain access to admin-only CLI commands:
        $ . admin-openrc
    2. Create a Placement service user using your chosen PLACEMENT_PASS:
        $ openstack user create --domain default --password-prompt placement

        User Password:placement123
        Repeat User Password:placement123
        +---------------------+----------------------------------+
        | Field               | Value                            |
        +---------------------+----------------------------------+
        | domain_id           | default                          |
        | enabled             | True                             |
        | id                  | fa742015a6494a949f67629884fc7ec8 |
        | name                | placement                        |
        | options             | {}                               |
        | password_expires_at | None                             |
        +---------------------+----------------------------------+
    3. Add the Placement user to the service project with the admin role:
        $ openstack role add --project service --user placement admin
 
    4. Create the Placement API entry in the service catalog:
        $ openstack service create --name placement \
          --description "Placement API" placement

        +-------------+----------------------------------+
        | Field       | Value                            |
        +-------------+----------------------------------+
        | description | Placement API                    |
        | enabled     | True                             |
        | id          | 2d1a27022e6e4185b86adac4444c495f |
        | name        | placement                        |
        | type        | placement                        |
        +-------------+----------------------------------+
    5. Create the Placement API service endpoints:
        注意:域名为你规划好url, 必须能够解析.
        $ openstack endpoint create --region RegionOne placement public http://stack.flex.net:8778
        +--------------+----------------------------------+
        | Field        | Value                            |
        +--------------+----------------------------------+
        | enabled      | True                             |
        | id           | 2b1b2637908b4137a9c2e0470487cbc0 |
        | interface    | public                           |
        | region       | RegionOne                        |
        | region_id    | RegionOne                        |
        | service_id   | 2d1a27022e6e4185b86adac4444c495f |
        | service_name | placement                        |
        | service_type | placement                        |
        | url          | http://controller:8778           |
        +--------------+----------------------------------+

        $ openstack endpoint create --region RegionOne placement internal http://stack.flex.net:8778
        +--------------+----------------------------------+
        | Field        | Value                            |
        +--------------+----------------------------------+
        | enabled      | True                             |
        | id           | 02bcda9a150a4bd7993ff4879df971ab |
        | interface    | internal                         |
        | region       | RegionOne                        |
        | region_id    | RegionOne                        |
        | service_id   | 2d1a27022e6e4185b86adac4444c495f |
        | service_name | placement                        |
        | service_type | placement                        |
        | url          | http://controller:8778           |
        +--------------+----------------------------------+

        $ openstack endpoint create --region RegionOne placement admin http://stack.flex.net:8778
        +--------------+----------------------------------+
        | Field        | Value                            |
        +--------------+----------------------------------+
        | enabled      | True                             |
        | id           | 3d71177b9e0f406f98cbff198d74b182 |
        | interface    | admin                            |
        | region       | RegionOne                        |
        | region_id    | RegionOne                        |
        | service_id   | 2d1a27022e6e4185b86adac4444c495f |
        | service_name | placement                        |
        | service_type | placement                        |
        | url          | http://controller:8778           |
        +--------------+----------------------------------+

安装配置组件

Install the packages:
```
# yum install openstack-placement-api
```

Edit the /etc/placement/placement.conf file and complete the following actions:

○ In the [placement_database] section, configure database access:
    [placement_database]
    # ...
    connection = mysql+pymysql://placement:placement123@dbs.flex.net/placement
○ In the [api] and [keystone_authtoken] sections, configure Identity service access:
    [api]
    # ...
    auth_strategy = keystone

    [keystone_authtoken]
    # ...
    auth_url = http://stack.flex.net:5000/v3
    memcached_servers = dbs.flex.net:11211
    auth_type = password
    project_domain_name = default
    user_domain_name = default
    project_name = service
    username = placement
    password = placement123

    注意: 注释或移除在掉在[keystone_authtoken]区域中的其它的选项

Populate the placement database:

# su -s /bin/sh -c "placement-manage db sync" placement

完成完装

○ Restart the httpd service:
    # systemctl restart httpd

校验安装

你需要admin的权限验证

加载admin的访问凭据，执行管理员命令:
```
$ . admin-openrc
```

执行状态检查命令:

$ placement-status upgrade check
+----------------------------------+
| Upgrade Check Results            |
+----------------------------------+
| Check: Missing Root Provider IDs |
| Result: Success                  |
| Details: None                    |
+----------------------------------+
| Check: Incomplete Consumers      |
| Result: Success                  |
| Details: None                    |
+----------------------------------+

运行对placement API的命令（这个步骤我没有成功，但不影响）:

○ Install the osc-placement plugin:
    $ pip install osc-placement
○ List available resource classes and traits:
    $ openstack --os-placement-api-version 1.2 resource class list --sort-column name
    +----------------------------+
    | name                       |
    +----------------------------+
    | DISK_GB                    |
    | IPV4_ADDRESS               |
    | ...                        |

    $ openstack --os-placement-api-version 1.6 trait list --sort-column name
    +---------------------------------------+
    | name                                  |
    +---------------------------------------+
    | COMPUTE_DEVICE_TAGGING                |
    | COMPUTE_NET_ATTACH_INTERFACE          |
    | ...                                   |

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OpenStackstein安装（四）placement

安装准备

安装配置组件

完成完装

校验安装

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