Date post: | 08-Jan-2017 |
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Technology |
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Openstack Heat & How Autoscaling works@Openstack chennai meetup Aug 2015
JayaprakashTechnical Lead, Product [email protected]
Beny RajaTechnical Lead, [email protected]
Overview
●Heat is the orchestration component of Openstack. Template-driven engine that allows us to describe and automate the deployment of infrastructure & application
●Extended capabilities such as Nested stacks, Resource Groups, Auto scaling, Software deployment using configuration management tools like puppet
Services
●Heat - CLI which communicates with heat-api●Heat-api - REST based service which sends api
requests to heat-engine via RPC●Heat-engine - Orchestrates openstack resources●Heat-api-cfn - REST based service which sends api
requests to heat-engine via RPC
Heat Architecture
HOT Template structure
●heat_template_version●description●parameter_groups●parameters●input●resources●output
Reference:http://docs.openstack.org/developer/heat/template_guide/hot_spec.html
HOT Template
Develop your own Resource Plugins
●Plugin Life cycle – Create,Update,Suspend,Delete,Resume
●Registering resource plugin name – OS::Nova::Workload
●Properties & Attributes●Handler Methods – handle_create, handle_update,
handle_delete...●Configure heat to register new plugins and restart
heat-engine service
Reference:http://docs.openstack.org/developer/heat/pluginguide.html
Heat - Standalone Mode●Orchestrate Multi openstack setups●Standalone mode configuration in heat.conf
○[paste_deploy]flavor = standalone
○[authpassword]multi_cloud = trueallowed_auth_uris = http://192.168.1.171:5000/v2.0, http://192.168.1.223:5000/v2.0●Heat cli to access remote openstackheat --os-no-client-auth --os-username admin --os-password openstack --os-tenant-name admin --os-auth-url http://192.168.1.223:5000/v2.0 --heat-url http://192.168.1.10:8004/v1/98073903698740af87fb57ca9e41eed5 stack-list
Autoscaling
●To maintain application availability and allows you to scale the capacity up or down automatically according to conditions you define
●Automatically increase the number of instances during demand spikes to maintain performance
●Heat & Ceilometer are the components used to implement Autoscaling in Openstack
Autoscaling workflow
Ceilometer Alarm Resource
Autoscaling Group Resourcelb_server.yaml
Alarm Action URL
●Heat engine server address●Stack id & name●Scaling resource id & name●URL params – Timestamp, Signature, Access key
http://192.168.1.142:8000/v1/signal/arn:openstack:heat::<stack_id>:stacks/test_stack/<resource_id>/resources/scaleup_policy?Timestamp=&SignatureMethod=HmacSHA256&AWSAccessKeyId=fa71fad02e974f4f8a21265c58bacf0f&SignatureVersion=2&Signature=poYnVLF9mLEGjBXbjT63svjCnymnhrLP9chFPHiyVoo%3D
References
●http://docs.openstack.org/developer/heat/template_guide/hot_spec.html
●https://wiki.openstack.org/wiki/Heat●https://github.com/openstack/heat-templates●https://wiki.openstack.org/wiki/Heat/Blueprints/heat-
multicloud●http://developer.openstack.org/api-ref-orchestration-
v1.html
Thank You