Explanation about the use of Policy Manager in FIWARE, whose mission is to provide policies to get a relative autoscaling of virtual machines.

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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