Apache Seata Transaction Coordinator

This is a repackaged open source software product wherein additional charges apply for cloudimg support services.

## Apache Seata - Distributed Transaction Coordinator AMI

Apache Seata is an open source distributed transaction solution for microservices. This AMI delivers a fully configured Transaction Coordinator so a business operation spanning several services and databases either commits everywhere or rolls back everywhere - with zero manual setup.

### The Problem This Solves

When a single business operation touches multiple microservices and databases, partial failures create data inconsistency - orders charged but never fulfilled, inventory decremented but shipments never created. Seata's Transaction Coordinator guarantees all-or-nothing semantics so your data stays consistent without hand-rolled compensation logic.

### Why This AMI Instead of a DIY Install

• Ready in minutes: Skip hours of downloading distributions, installing Java, writing systemd units and hardening credentials. This image boots ready to accept client registrations.
• No default credentials, ever: A unique console password and console token-signing key are generated per instance at first boot, so no shared secret exists in the image and the upstream default login never governs a running server.
• Production-hardened from launch: A dedicated unprivileged service account, a console bound to loopback and published only through nginx, and a coordinator that registers itself as a healthy cluster member the console displays.
• 24/7 professional support: cloudimg engineers assist with deployment, client wiring, TLS termination and JVM tuning via email and live chat.

### Application Stack

• Apache Seata 2.6.0 Transaction Coordinator in standalone file-store mode - self-contained, no external database to provision
• Bundled Seata NamingServer hosting a login-protected web console and registry, bound to loopback and fronted by nginx on port 80
• Coordinator RPC endpoint on port 8091 for your microservice clients
• seata-namingserver, seata-server and nginx as managed systemd services, enabled and active
• Headless OpenJDK Java runtime, run by a dedicated unprivileged service account

### Security

Secure First Boot: A one-shot service generates a fresh console password and token-signing key unique to each instance, writing them into configuration before services start and storing the password in a root-only file.

Console Isolation: The web console is bound to loopback and reachable only through nginx on port 80. Restrict that front, plus coordinator RPC port 8091, to trusted networks with your security groups, and terminate TLS at nginx or your load balancer.

Encryption at Rest: Enable AWS EBS encryption on the root volume to protect configuration and transaction state.

### Use Cases

• E-commerce order pipelines: Coordinate order, payment and inventory transactions across microservices so customers are never charged for unfulfilled orders and stock counts stay accurate.
• Multi-step settlement workflows: Guarantee all-or-nothing semantics where partial commits create reconciliation risk.
• Microservice estate coordination: Run AT, TCC, SAGA or XA transactions across your services, choosing the mode that fits each service.

### Architecture Overview

Port 80 (nginx) forwards over loopback to the Seata NamingServer console (web UI and registry). Port 8091 is the Seata Transaction Coordinator RPC endpoint for client connections. All services run under a dedicated unprivileged account via systemd.

### Getting Started

1. Launch the AMI and connect via SSH as the default user for your OS variant.

2. Retrieve the generated console password: sudo cat /root/seata-credentials.txt

3. Browse to http:/// and sign in as 'seata' with that password.

4. Point your Seata clients at :8091 (standalone file-store mode).

See the paired cloudimg deployment guide for security-group rules, TLS termination and client SDK configuration.

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