placement 组件作用理解
举个例子:
一个资源提供者可以是一个计算节点,共享存储池,或一个IP分配池。placement服务跟踪每个供应商的库存和使用情况。例如,在一个计算节点创建一个实例的可消费资源如计算节点的资源提供者的CPU和内存,磁盘从外部共享存储池资源提供商和IP地址从外部IP资源提供者。
Placement 的核心价值还是在于其高度的 “灵活性” 上,可以适配用户在生产环境中的复杂多样的资源管理需求,也为云平台开发者带来了一种代码方案的可行性。
OpenStack-Placement组件部署
部署思路:
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:
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)
00-placement-api.conf
主要修改思路:
Apache权限、访问控制
1.创建数据库实例和数据库用户
[root@controller ~]# 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@controller~]# openstack user create --domain default --password PLACEMENT_PASS placement
placement用户对service项目拥有admin权限
[root@controller~]# openstack role add --project service --user placement admin
创建一个placement服务,服务类型为placement
[root@controller ~]# openstack service create --name placement --description "Placement API" placement
注册API端口(8778)到placement的service中;注册的信息会写入到mysql中
[root@controller ~]# openstack endpoint create --region RegionOne placement public http://controller:8778
[root@controller ~]# openstack endpoint create --region RegionOne placement internal http://controller:8778
[root@controller ~]# openstack endpoint create --region RegionOne placement admin http://controller:8778
3.安装placement服务
yum -y install openstack-placement-api
修改placement配置文件
cp /etc/placement/placement.conf{,.bak}
grep -Ev '^$|#' /etc/placement/placement.conf.bak > /etc/placement/placement.conf
修改参数:
openstack-config --set /etc/placement/placement.conf placement_database connection mysql+pymysql://placement:PLACEMENT_DBPASS@controller/placement
openstack-config --set /etc/placement/placement.conf api auth_strategy keystone
openstack-config --set /etc/placement/placement.conf keystone_authtoken auth_url http://controller:5000/v3
openstack-config --set /etc/placement/placement.conf keystone_authtoken memcached_servers controller: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@controller ~]# cd /etc/placement/
[root@controller placement]# ls
placement.conf placement.conf.bak policy.json
[root@controller placement]# cat placement.conf
[DEFAULT]
[api]
auth_strategy = keystone
[cors]
[keystone_authtoken]
auth_url = http://controller:5000/v3
memcached_servers = controller:11211
auth_type = password
projecontroller_domain_name = Default
user_domain_name = Default
projecontroller_name = service
username = placement
password = PLACEMENT_PASS
[oslo_policy]
[placement]
[placement_database]
connection = mysql+pymysql://placement:PLACEMENT_DBPASS@controller/placement
connecontrollerion = mysql+pymysql://placement:PLACEMENT_DBPASS@controller/placement
[profiler]
导入数据库
su -s /bin/sh -c "placement-manage db sync" placement
虚拟主机配置文件
注: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 )
[root@controller ~]# cd /etc/httpd/conf.d/
[root@controller 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-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>
<IfVersion >= 2.4>
Require all granted
</IfVersion>
<IfVersion < 2.4>
Order allow,deny
Allow from all
</IfVersion>
</Directory>
注:修改不要忘记重启apache (httpd)
4.测试
curl 测试访问,查看端口,检查placement状态
placement]# curl controller:8778
netstat -natp | grep 8778
placement-status upgrade check