thermionic

README

Thermionic

Thermionic is a lightweight, distributed, highly available relational database, using SQLite for the underlying storage engine.

SQLite doesn't naturally allow clustering out of the box, the following project enables that by building on top of distributed version, of SQLite.

The configuration of Thermionic can be as a singular node or in a cluster setup. Even when using Thermionic in singular node the global clustering database is still used, effectively behaving as a regular SQLite database.

Since each node of the cluster also needs to be aware of other nodes in the cluster it also uses a SQLite database (local) which can also hold state and queried for information.

Running Thermionic as part of a larger system, as a central store for some critical relational data, without having to run larger, more complex distributed databases should be possible because of the minimal setup.

Copyright Notice

DB Clustering work is derived from lxc/lxd

Motivation

Whilst re-visiting LXD clustering in Juju, I wanted to understand how LXD clustering worked in terms of querying and configuring the cluster. Whilst doing this, it was surprising how clean the implementation was for setting up a clustered SQLite database and so removing the LXC parts of the LXD project created the following Thermionic project.

Peers

• dqlite
• lxc/lxd
• rqlite