文章目录
一、Placement简介
1.Placement提供了什么？
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
2.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）
2. 00-placement-api.conf
主要修改思路：
Apache权限、访问控制
二、部署流程
1. 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；
2 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 | 78fb711680be495e90cfdff48beadd13 |
| 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 | a02747cae70c4c7b9a8996b176ab04e3 |
| 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 | e9523ccc3ae74c7c815ad61477abd254 |
| interface | public |
| region | RegionOne |
| region_id | RegionOne |
| service_id | a02747cae70c4c7b9a8996b176ab04e3 |
| 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 | d70cdec5113f4a30a1d0ef97359e6c38 |
| interface | internal |
| region | RegionOne |
| region_id | RegionOne |
| service_id | a02747cae70c4c7b9a8996b176ab04e3 |
| 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 | 26d77b720e904dc392215b6cad78e2a5 |
| interface | admin |
| region | RegionOne |
| region_id | RegionOne |
| service_id | a02747cae70c4c7b9a8996b176ab04e3 |
| service_name | placement |
| service_type | placement |
| url | http://ct:8778 |
+--------------+----------------------------------+
● 安装placement服务
[root@controller ~]# yum -y install openstack-placement-api
3. 修改 placement配置文件
#修改配置文件，可以使用shell脚本进行参数的传入
cp /etc/placement/placement.conf{
,.bak}
grep -Ev '^$|#' /etc/placement/placement.conf.bak > /etc/placement/placement.conf
openstack-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
- 通过cat命令查看placement配置文件
[root@ct placement]# cat /etc/placement/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]
4. 导入数据库及修改Apache配置
4.1 导入数据库
[root@ct ~]# 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)
4.2 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 ~]# vim 00-placement-api.conf #修改配置文件，在末尾添加
<Directory /usr/bin>
<IfVersion >= 2.4>
Require all granted
</IfVersion>
<IfVersion < 2.4>
Order allow,deny
Allow from all
</IfVersion>
</Directory>
[root@ct conf.d]# cat 00-placement-api.conf # 查看配置文件
Listen 8778
<VirtualHost *:8778>
WSGIProcessGroup placement-api
WSGIApplicationGroup %{
GLOBAL}
WSGIPassAuthorization On
WSGIDaemonProcess placement-api processes=3 threads=1 user=placement group=placement
WSGIScriptAlias / /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-script
Options +ExecCGI
WSGIProcessGroup placement-api
WSGIApplicationGroup %{
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>
4.3 重新启动apache并测试
[root@ct ~]# systemctl restart httpd
[root@ct ~]# curl ct:8778 # curl 测试访问
{
"versions": [{
"status": "CURRENT", "min_version": "1.0", "max_version": "1.36", "id": "v1.0", "links": [{
"href": "", "rel": "self"}]}]}[root@ct conf.d]
[root@ct ~]# netstat -natp | grep 8778 # 查看端口占用（netstat、lsof）
tcp 0 0 192.168.1.10:36708 192.168.1.10:8778 TIME_WAIT -
tcp6 0 0 :::8778 :::* LISTEN 36434/httpd
[root@ct ~]# placement-status upgrade check # 检查placement状态
+----------------------------------+
| Upgrade Check Results |
+----------------------------------+
| Check: Missing Root Provider IDs |
| Result: Success |
| Details: None |
+----------------------------------+
| Check: Incomplete Consumers |
| Result: Success |
| Details: None |
+----------------------------------+