Synnefo

Deployment

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Node types

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Nodes in a Synnefo deployment belong in one of the following types:

DB

**

A node [or more than one nodes, if using an HA configuration], running a DB

engine supported by the Django ORM layer. The DB is the single source of

truth for the servicing of API requests by Synnefo.

Services: PostgreSQL / MySQL

APISERVER

*********

A node running the implementation of the OpenStack API, in Django. Any number

of APISERVERs can be used, in a load-balancing configuration, without any

special consideration. Access to a common DB ensures consistency.

Services: Web server, vncauthproxy

QUEUE

*****

A node running the RabbitMQ software, which provides AMQP functionality. More

than one QUEUE nodes may be deployed, in an HA configuration. Such

deployments require shared storage, provided e.g., by DRBD.

Services: RabbitMQ [rabbitmq-server]

LOGIC

*****

A node running the business logic of Synnefo, in Django. It dequeues

messages from QUEUE nodes, and provides the context in which business logic

functions run. It uses Django ORM to connect to the common DB and update the

state of the system, based on notifications received from the rest of the

infrastructure, over AMQP.

Services: the Synnefo logic dispatcher [/logic/dispatcher.py]

GANETI-MASTER and GANETI-NODE

*****************************

A single GANETI-MASTER and a large number of GANETI-NODEs constitute the

Ganeti backend for Synnefo, which undertakes all VM management functions.

Any APISERVER can issue commands to the GANETI-MASTER, over RAPI, to effect

changes in the state of the VMs. The GANETI-MASTER runs the Ganeti request

queue.

Services:

 only on GANETI-MASTER:

   the Synnefo Ganeti monitoring daemon [/ganeti/snf-ganeti-eventd]

   the Synnefo Ganeti hook [/ganeti/snf-ganeti-hook.py].

 on each GANETI_NODE:

   a deployment-specific KVM ifup script

   properly configured `NFDHCPD`_

UI deployment

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Using Apache

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.. todo:: document apache configuration

Using nginx

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.. todo:: document nginx configuration

Serving static files

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.. todo:: document serving static files instructions