Editing Category:JIL (section)

==Training about JIL project. Dated 23 January 2026 - Tetra Support Staff - Takshay==

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'''Video summary:''' Architecture training on JP Associates/JIL's Zimbra Network Edition setup, which is unusual in that it's really *two* separate multi-server Zimbra clusters (one for ~1650 users, one for ~500) sharing the same external domain. Each cluster has active-active MTA pairs, multi-master LDAP replication (MMR, not the default single-master replica type), an active-passive PCS-clustered mailbox pair, plus its own archive and log server, fronted by HAProxy for high availability. Internal mail between the two clusters routes MTA-to-MTA based on domain-level split routing rules; if a user isn't found on one cluster the mail retries against the other before bouncing. External-facing access goes through a separate single-URL server running an Nginx + Python/Flask app that looks up which cluster a given user's mailbox lives on and redirects the login accordingly (mobile/IMAP/POP/ActiveSync instead go directly through per-cluster virtual IPs, since the single-URL server only handles web/443). Also covers why a dedicated OpenLDAP lookup server was built in front of the Barracuda spam gateway -- Barracuda can't hold two entries for the same domain, so this lookup server independently mirrors valid usernames from both Zimbra clusters so Barracuda can bounce mail for nonexistent users before it ever reaches the mail servers. Full configuration docs and server details for this setup are pointed to on the wiki's own "JIL" special category page.


[[File:Jalindia_cluster_installation_and_configuration.pdf]]