Princeton Geniza Project¶

Princeton Geniza Project (PGP or Geniza for short) is a custom Python/Django web application. Version 4.0-4.x developed by CDH.

Production site: https://geniza.princeton.edu/en/
software: https://github.com/Princeton-CDH/geniza/

The public site is accessed through the PUL load balancer (NGINX+).

There are two VMs for each environment (production, staging) running in parallel with the same content and application code. The load balancer routes traffic between the two VMs; redundancy allows for one host to be taken down for maintenance without taking the site down.

Both instances of the application connect to the same PostgreSQL database and Solr collection. User-uploaded content is stored on a shared NFS drive accessible to both machines.

        flowchart TD
    nginxplus[NGINX+ ] -- proxies --> nginx
    nginxplus[NGINX+ ] -- proxies --> nginx2
    subgraph genizavm1 [Geniza VM1]
     nginx[NGINX] -- runs --> Django1
     nginx -- serves --> static1[static assets]
    end
    subgraph genizavm2 [Geniza VM2]
     nginx2[NGINX] -- runs --> Django2
     nginx2 -- serves --> static2[static assets]
    end
    Django1 --> db[(PostgreSQL)]
    Django1 --> solr[(Solr)]
    Django2 --> db[(PostgreSQL)]
    Django2 --> solr[(Solr)]
    genizavm1 --> nfs[/NFS\]
    genizavm2 --> nfs[/NFS\]

Other details¶

Load balancer proxy configuration is managed in PUL princeton_ansible