OTH (Online Travel Hub)¶

OTH is a specialized service for specific market segments with dedicated infrastructure.

Architecture Diagram¶

graph TB
    subgraph OTH_INFRA["OTH Infrastructure"]
        subgraph OTH_LB["OTH Load Balancers"]
            OTHLB1["OTH-HAProxy-Master<br/>10.32.8.106"]
            OTHLB2["OTH-HAProxy-Standby<br/>10.32.8.107"]
            OTHVIP["OTH VIP<br/>10.32.8.105"]
        end

        subgraph OTH_SERVERS["OTH Application Servers (VMs)"]
            OTH1["OTH-1<br/>10.32.8.11"]
            OTH2["OTH-2<br/>10.32.8.86"]
            OTH3["OTH-3<br/>10.32.8.40"]
        end

        subgraph OTH_CACHE["OTH Caching"]
            OTHCM["OTH-Cache-Master"]
            OTHCS["OTH-Cache-Standby"]
            REDISOTH["Redis-OTH"]
        end
    end

    OTHVIP --> OTHLB1
    OTHVIP -.->|"Failover"| OTHLB2
    OTHLB1 & OTHLB2 --> OTH1 & OTH2 & OTH3
    OTH1 & OTH2 & OTH3 --> OTHCM & REDISOTH

    style OTHVIP fill:#87CEEB
    style OTHLB1 fill:#90EE90
    style OTHLB2 fill:#FFE4B5

Server Inventory¶

Component	IP Address	Type	Host
OTH-1	10.32.8.11	VM	XCP-1
OTH-2	10.32.8.86	VM	XCP-3
OTH-3	10.32.8.40	VM	XCP-1
OTH-HAProxy-Master	10.32.8.106	VM	XCP-2
OTH-HAProxy-Standby	10.32.8.107	VM	XCP-2
OTH VIP	10.32.8.105	Virtual	-
OTH-Cache-Master	-	VM	XCP-2
OTH-Cache-Standby	-	VM	XCP-2
Redis-OTH	-	VM	XCP-1

OTH Features¶

Feature	Description
Purpose	Specialized travel hub for specific markets
Architecture	Dedicated servers, separate from main API
Load Balancing	HAProxy HA pair with VIP
Caching	Redis + dedicated cache servers
Database	Separate optimized database

Traffic Flow¶

sequenceDiagram
    participant Client as OTH Client
    participant VIP as OTH VIP<br/>10.32.8.105
    participant LB as HAProxy<br/>Master/Standby
    participant OTH as OTH Servers<br/>(1, 2, 3)
    participant Cache as Redis-OTH

    Client->>VIP: Request
    VIP->>LB: Route to active LB
    LB->>OTH: Load balance
    OTH->>Cache: Check cache
    Cache-->>OTH: Cache response
    OTH-->>LB: Response
    LB-->>Client: Return data

High Availability¶

Component	HA Method
Load Balancer	Active-Standby with VIP failover
Application	3 OTH servers behind LB
Cache	Master-Standby cache pair
Redis	Dedicated Redis instance

Last Updated: 2025-12-02