aah Cluster Deployment

This document provides aah cluster deployment references for Web and RESTful API.

Web Application Cluster

aah web application cluster deployment is typically same as industry known way. Deploy as many nodes as required by your traffic, high availability, etc.

Typically application configuration is same in all nodes in the cluster except node specific config values. For example: instance_name. Following checklist is to provide key configuration reference:

  • Instance Name: Provide aah instance_name config value via Environment Variable or External Config file. instance_name value is important one; it helps you to distinguish application log from various nodes in the aah cluster.
    • Let’s say your web application name is “User Portal”. For example: instance_name = "sfo-up-web-01", instance_name = "sfo-up-web-02". Refer to logging.
  • Session Management: Ensure section security.session { ... } config values from security.conf is same in all nodes in the cluster to process user session. For example: security.session.sign_key, security.session.enc_key, etc.
  • Anti-CSRF: Ensure section security.anti_csrf { ... } config values from security.conf is same in all nodes in the cluster to prevent CSRF attacks properly. For example: security.anti_csrf.sign_key, security.anti_csrf.enc_key, etc.

RESTful API Cluster

aah RESTful API cluster deployment is typically same as industry known way. Deploy as many nodes as required by your traffic, high availability, etc.

Typically application configuration is same in all nodes in the cluster except node specific config values. For example: instance_name.

  • Instance Name: Provide aah instance_name config value via Environment Variable or External Config file. instance_name value is important one; it helps you to distinguish application log from various nodes in the aah cluster.
    • Let’s say your API service name is “User Subscription Service”. For example: instance_name = "sfo-uss-api-01", instance_name = "sfo-uss-api-02". Refer to logging.

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