Editing Category:WBOBPASS (section)

==Training on UDMA-ARCH.. Dated 02 nov 2024 - Tetra Support Staff - Manish Singh==

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'''Video summary:''' Architecture overview of UDMA (Urban Development & Municipal Affairs), another West Bengal state government application on the same general platform family as OBPASS/NKDA/the upcoming Panchayat project -- all hosted and infrastructure-provisioned by the state's own data center (SDC), with Tetra handling installation and infra-level support only (application-level PHP bugs are a separate PHP team's responsibility). Production architecture: a hardware load balancer in front of two active-active reverse proxy servers sitting in a DMZ zone (deliberately holding no data, so a compromise there can't leak anything), forwarding to two active-active application servers and a master/slave database pair (again, manual failover only) in a protected "MZ" zone -- plus two Windows servers handling form-scrutiny checks and an unused ticketing server built at initial setup but never adopted. Application and database servers share a common NFS-mounted disk for uploaded PDFs/documents. Staging is a simpler single proxy/app/DB LAMP stack. Access to all of it is via the state data center's own VPN (OTP-based, provisioned by a named Tetra contact who liaises with the SDC). Also notes a recent platform migration for these servers from a previous hosting provider onto the current one.