一、创建数据库实例和数据库用户

[root@ct ~]# mysql -uroot -p
MariaDB [(none)]> CREATE DATABASE placement;
MariaDB [(none)]> GRANT ALL PRIVILEGES ON placement.* TO 'placement'@'localhost' IDENTIFIED BY 'PLACEMENT_DBPASS';
MariaDB [(none)]> GRANT ALL PRIVILEGES ON placement.* TO 'placement'@'%' IDENTIFIED BY 'PLACEMENT_DBPASS';
MariaDB [(none)]> flush privileges;
MariaDB [(none)]> exit；

二、创建Placement服务用户和API的endpoint

● 创建placement用户

[root@ct ~]# openstack user create --domain default --password PLACEMENT_PASS placement
+---------------------+----------------------------------+
| Field               | Value                            |
+---------------------+----------------------------------+
| domain_id           | default                          |
| enabled             | True                             |
| id                  | 838a6cc4aaa34060904ba3ee86e2b8cc |
| name                | placement                        |
| options             | {}                               |
| password_expires_at | None                             |
+---------------------+----------------------------------+

● 给与placement用户对service项目拥有admin权限

[root@ct ~]# openstack role add --project service --user placement admin

● 创建一个placement服务，服务类型为placement

[root@ct ~]# openstack service create --name placement --description "Placement API" placement
+-------------+----------------------------------+
| Field       | Value                            |
+-------------+----------------------------------+
| description | Placement API                    |
| enabled     | True                             |
| id          | 034b1b6190a64885bbf5bd85800a7b38 |
| name        | placement                        |
| type        | placement                        |
+-------------+----------------------------------+

● 注册API端口到placement的service中；注册的信息会写入到mysql中

[root@ct ~]# openstack endpoint create --region RegionOne placement public http://ct:8778
+--------------+----------------------------------+
| Field        | Value                            |
+--------------+----------------------------------+
| enabled      | True                             |
| id           | af8e6d9f834e40a88907ae6e761cb588 |
| interface    | public                           |
| region       | RegionOne                        |
| region_id    | RegionOne                        |
| service_id   | 034b1b6190a64885bbf5bd85800a7b38 |
| service_name | placement                        |
| service_type | placement                        |
| url          | http://ct:8778                   |
+--------------+----------------------------------+[root@ct ~]# openstack endpoint create --region RegionOne placement internal http://ct:8778
+--------------+----------------------------------+
| Field        | Value                            |
+--------------+----------------------------------+
| enabled      | True                             |
| id           | 371032b02d0543d7ae5cd1069f9ed13b |
| interface    | internal                         |
| region       | RegionOne                        |
| region_id    | RegionOne                        |
| service_id   | 034b1b6190a64885bbf5bd85800a7b38 |
| service_name | placement                        |
| service_type | placement                        |
| url          | http://ct:8778                   |
+--------------+----------------------------------+[root@ct~]# openstack endpoint create --region RegionOne placement admin http://ct:8778
+--------------+----------------------------------+
| Field        | Value                            |
+--------------+----------------------------------+
| enabled      | True                             |
| id           | 1fd7feaa9767424baed4137e62ece5ec |
| interface    | admin                            |
| region       | RegionOne                        |
| region_id    | RegionOne                        |
| service_id   | 034b1b6190a64885bbf5bd85800a7b38 |
| service_name | placement                        |
| service_type | placement                        |
| url          | http://ct:8778                   |
+--------------+----------------------------------+

● 安装placement服务

[root@ct ~]# yum -y install openstack-placement-api

● 修改placement配置文件

#修改配置文件placement.conf
cp -a /etc/placement/placement.conf{,.bak}
grep -Ev '^$|#' /etc/placement/placement.conf.bak > /etc/placement/placement.confopenstack-config --set /etc/placement/placement.conf placement_database connection mysql+pymysql://placement:PLACEMENT_DBPASS@ct/placement
openstack-config --set /etc/placement/placement.conf api auth_strategy keystone
openstack-config --set /etc/placement/placement.conf keystone_authtoken auth_url  http://ct:5000/v3
openstack-config --set /etc/placement/placement.conf keystone_authtoken memcached_servers ct:11211
openstack-config --set /etc/placement/placement.conf keystone_authtoken auth_type password
openstack-config --set /etc/placement/placement.conf keystone_authtoken project_domain_name Default
openstack-config --set /etc/placement/placement.conf keystone_authtoken user_domain_name Default
openstack-config --set /etc/placement/placement.conf keystone_authtoken project_name service
openstack-config --set /etc/placement/placement.conf keystone_authtoken username placement
openstack-config --set /etc/placement/placement.conf keystone_authtoken password PLACEMENT_PASS

#查看placement配置文件
[root@ct placement]# cat placement.conf
[DEFAULT]
[api]
auth_strategy = keystone
[cors]
[keystone_authtoken]
auth_url = http://ct:5000/v3               #指定keystone地址
memcached_servers = ct:11211           #session信息是缓存放到了memcached中
auth_type = password
project_domain_name = Default
user_domain_name = Default
project_name = service
username = placement
password = PLACEMENT_PASS
[oslo_policy]
[placement]
[placement_database]
connection = mysql+pymysql://placement:PLACEMENT_DBPASS@ct/placement
[profiler]

● 导入数据库

su -s /bin/sh -c "placement-manage db sync" placement
/usr/lib/python2.7/site-packages/pymysql/cursors.py:170: Warning: (1280, u"Name 'alembic_version_pkc' ignored for PRIMARY key.")result = self._query(query)cd

● 修改Apache配置文件： 00-placemenct-api.conf（安装完placement服务后会自动创建该文件-虚拟主机配置）

#虚拟主机配置文件

[root@ct ~]# cd /etc/httpd/conf.d/
[root@ct conf.d]# ls
00-placement-api.conf  autoindex.conf  README  userdir.conf  welcome.conf  wsgi-keystone.conf

[root@ct conf.d]# cat 00-placement-api.conf         #安装完placement会自动创建此文件
Listen 8778<VirtualHost *:8778>WSGIProcessGroup placement-apiWSGIApplicationGroup %{GLOBAL}WSGIPassAuthorization OnWSGIDaemonProcess placement-api processes=3 threads=1 user=placement group=placementWSGIScriptAlias / /usr/bin/placement-api<IfVersion >= 2.4>ErrorLogFormat "%M"</IfVersion>ErrorLog /var/log/placement/placement-api.log#SSLEngine On#SSLCertificateFile ...#SSLCertificateKeyFile ...
</VirtualHost>Alias /placement-api /usr/bin/placement-api
<Location /placement-api>SetHandler wsgi-scriptOptions +ExecCGIWSGIProcessGroup placement-apiWSGIApplicationGroup %{GLOBAL}WSGIPassAuthorization On
</Location>
<Directory /usr/bin>          #此处是bug，必须添加下面的配置来启用对placement api的访问，否则在访问apache的
<IfVersion >= 2.4>                #api时会报403；添加在文件的最后即可Require all granted
</IfVersion>
<IfVersion < 2.4>              #apache版本；允许apache访问/usr/bin目录；否则/usr/bin/placement-api将不允许被访问Order allow,deny                Allow from all          #允许apache访问
</IfVersion>
</Directory>

● 重新启动apache

[root@ct placement]# systemctl restart httpd

● 测试
① curl 测试访问

[root@ct placement]# curl ct:8778
{"versions": [{"status": "CURRENT", "min_version": "1.0", "max_version": "1.36", "id": "v1.0", "links": [{"href": "", "rel": "self"}]}]}

② 查看端口占用（netstat、lsof）

[root@ct placement]# netstat -natp | grep 8778
tcp6       0      0 :::8778                 :::*                    LISTEN      36231/httpd

③ 检查placement状态

[root@ct placement]# placement-status upgrade check
+----------------------------------+
| Upgrade Check Results            |
+----------------------------------+
| Check: Missing Root Provider IDs |
| Result: Success                  |
| Details: None                    |
+----------------------------------+
| Check: Incomplete Consumers      |
| Result: Success                  |
| Details: None                    |
+----------------------------------+

小结

Placement提供了placement-apiWSGI脚本，用于与Apache，nginx或其他支持WSGI的Web服务器一起运行服务(通过nginx或apache实现python入口代理)。
根据用于部署OpenStack的打包解决方案，WSGI脚本可能位于/usr/bin 或中/usr/local/bin
Placement服务是从 S 版本，从nova服务中拆分出来的组件，作用是收集各个node节点的可用资源，把node节点的资源统计写入到mysql,Placement服务会被nova scheduler服务进行调用 Placement服务的监听端口是8778

需修改的配置文件：

① placement.conf
主要修改思路：
Keystone认证相关（url、HOST:PORT、域、账号密码等）
对接数据库（位置）
② 00-placement-api.conf
主要修改思路：
Apache权限、访问控制

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OpenStack-Placement组件部署

一、创建数据库实例和数据库用户

二、创建Placement服务用户和API的endpoint

小结

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