The document describes Policy Manager, a tool for managing policies in cloud environments through rules, facts, and actions. Policy Manager allows users to define rules using conditions and actions that are triggered when certain facts occur. It provides a REST API to create and manage elasticity rules to scale virtual machines based on metrics like CPU usage. Rules are written in JSON and can implement various actions like notifications, scaling, and restarting VMs.

1. Policy Manager: Managing facts, rules and actions
Guillermo Jiménez, Fernando López
IMDEA // TID
Cloud Chapter. FICORE
Guillermo.jimenezprieto@imdea.org, @geon_exus
fernando.lopezaguilar@telefonica.com, @flopezaguilar

2. TECHNOLOGIES
Python
Django
Pyclips framework
Clips
Redis
RabbitMQ
MySQL

3. POLICIES
• Policy Manager provides different policies to get VM
automation in the cloud.
• It could be uses to get notification about different facts
and actions.
• Those facts and actions are executed when certain
conditions are taking place.

4. EXAMPLE POLICIES
• Data resources collected from the virtual machines.
• CPU, Memory, Hard Disk and network usage.
• User could define some conditions and actions to be
performed.
• This allows infinite possibilities:
• load balancing policies moving VMs to nodes with less utilization,
• increase resources or nodes number
• availability policies (restart VM) when it crashes.
• generate this VM in different nodes, etc.

5. FEATURES
Policy Manager implements a REST API to manage rules.
User could write his own rules.
Rules are written in a simple human language: JSON.
User can implement his own actions from a notification.

6. Api-Agent
Rules Engine
CLIENT
Fiware-cloto
Fiware-cloto
Nova, Murano, etc
OpenStack ServicesUser Server
Actions

7. Api-Agent
Rules Engine
Fact-Gen
(defRule)
store(Conditions and actions)
(actions)
get(Conditions, actions)
(Facts)
(AverageFacts)
suscribe(URL, serverId)
PUT ContextData(CPU, RAM, HDD, Network?)
External
Service
START
POST(conditions, actions, serverId)
Fiware-Facts
Redis
store(AverageFacts)
Fiware-cloto
POST(subscriptions)
RabbitMQ
EnvironmentManager
get(AverageFacts)
Environments *
(actions)
eval(AverageFacts,
Conditions, actions)
(conditions, actions)
(actions)
Context
Broker

8. POLICY MANAGER RULES
Definition of a rule:
{
"action": {
"actionName": "notify-scale",
"operation": "scaleUp"
},
"name": "AlertCPU",
"condition": {
"cpu": {
"value": 98.3,
"operand": "greater"
},
"mem": {
"value": 95,
"operand": "greater equal"
},
"hdd": {
"value": 95,
"operand": "greater equal"
},
"net": {
"value": 95,
"operand": "greater equal"
}
}
}

9. POLICY API INFORMATION
REST API

10. POLICY API
AUTHENTICATION
Each request requires credentials and require a header
containing a valid Token from OpenStack keystone.
X-Auth-Token: eaaafd18-0fed-4b3a-81b4-663c99ec1cbb

11. POLICY API OPERATIONS
• General Operations.
• Get the information of the API.
• Update the window size.
• Elasticity rules.
• Create a new elasticity rule.
• Update an elasticity rule.
• Delete an elasticity rule. Get an elasticity
rule.
• Servers. Get the list of all servers'
rules.
• Get the list of all rules of a server.
• Update the context of a server.
• Subscription to rules.
• Create a new subscription.
• Delete a subscription.
• Get a subscription.

12. Kind of actions
notify-scale
• scaleUp
• scaleDown
notify-email
"action": {
"actionName": "notify-scale",
"operation": "scaleUp"
},
"action": {
"actionName": "notify-scale",
"operation": "scaleDown"
},
"action": {
"actionName": "notify-email",
"email": “name@host.com”,
"body": “Example description”
},
POLICY MANAGER RULES

13. More possible actions:
• Check VM alive
• Restart VM
• Move to another node
• Stop VM
• All actions you can implement.
POLICY MANAGER RULES

14. Kind of operands about server
measures (cpu, mem, hdd and disk):
• greater
• greater equal
• less
• less equal
"condition": {
"cpu": {
"value": 98.3,
"operand": "greater"
},
"mem": {
"value": 95,
"operand": "greater equal"
},
"hdd": {
"value": 95,
"operand": "greater equal"
},
"net": {
"value": 95,
"operand": "greater equal"
}
}
POLICY MANAGER RULES

15. DEMO
N
-

16. • Policy Manager:https://forge.fi-
ware.org/plugins/mediawiki/wiki/fiware/index.php/Policy_Manager_Op
en_RESTful_API_Specification
• Pyclips Webpage: http://pyclips.sourceforge.net
• Django project: https://www.djangoproject.com
• Redis: http://redis.io
• RabbitMQ: http://www.rabbitmq.com
• MySQL: http://mysql.com
REFERENCES

17. 17

18. http://fiware.org
http://lab.fiware.org
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