The document outlines requirements and criteria for a database solution involving two buildings 30km apart with a WAN link. The chosen solution was MariaDB with Galera cluster for high availability and synchronous replication across sites, along with Maxscale for read/write splitting and failover. Maxscale instances on each site allow for zero downtime database patching and upgrades per site, while the Galera cluster provides structure-independent synchronous replication between sites.

1. MARIADB - MAXSCALE
Certificates generation

2. ZETES

3. REQUIREMENTS
• 24x7

4. REQUIREMENTS
• 2 buildings, WAN link
30 Km

5. REQUIREMENTS
• Regular 0 down-time patching

6. REQUIREMENTS
• 0 cloud

7. REQUIREMENTS
• Eazy db update/upgrade

8. REQUIREMENTS
• Active-Active

9. REQUIREMENTS
• Structure-independent DB sync

10. CRITERIA
• “Small” databases (~50Gb)
• Transparent Data Encryption
• Inter-node network encryption

11. CRITERIA
• Complete
• Partitioning
• Online Indexing

12. CRITERIA
• Partially available in Community Edition

13. SOLUTION CHOSEN
• MariaDB – Galera
• Maxscale
• 4 DB nodes + 1 arbitrator

14. 0 DOWNTIME PATCHING / DB UPDATE-
UPGRADE
• Only maxscale is NOT patchable online
• Maxscale on each site
• DB patching per site

15. Site 2 Site 1
Maxscale Maxscale
Apps
Apps
Arbitrator