Release	Classification	Level	DB Platform	Categories
3.11.0.2 +	Information		ALL	High Availability

How to configure HA in ScaleArc v 3.11.0.2 or Later in Cloud environment (AWS / Azure).

How to configure HA in ScaleArc v 3.11.0.2 or Later in Cloud environment (AWS / Azure)? 

High Availability (HA) allows a pair of ScaleArc servers to function as a redundant cluster.

This KB describes the steps to configure High Availability cluster in ScaleArc on Cloud environment (AWS / Azure). 

Pre-Requisites to configure HA:

• Create two ScaleArc v3.11.0.2 or later Instances
• The Network Interface on which the HA will be configured should be assigned a STATIC IP Address and it should be visible in the ScaleArc UI.
• The following types of IP address are not recommended to be used for HA configuration.
  • Elastic IP address in AWS.
  • Dynamically assigned IP address (DHCP).
  • NATted IP addresses.
• Both ScaleArc Nodes must be able to reach each other over the network.
• The configuration of both the ScaleArc nodes must be identical.
• Choose an Option to Configure Fencing: ScaleArc Fencing intelligently resolves a split-brain situation between two nodes in HA mode. The algorithm employs a 'capture the flag technique' which requires storage of metadata reliably along the traffic path. This storage can be a database server configured inside a ScaleArc cluster, a -third– party external database server, or a Linux-based SSH server.

Configure HA:

• On the Primary Scalearc Node, Go to Settings >> HA settings:

• Select an option for fencing. (Scalearc cluster / External DB server / SSH Server). We recommend you to go for SSH Server in case of AWS.

• Enter Remote Interface (Interface of the Secondary Node) and Remote IP (Internal IP of the Secondary Node).

• Click on “Configure HA” and enter the UI credentials of the Secondary Scalearc Instance, Click "Submit" once done.

• ScaleArc will ask you to login to the Primary Node once HA configuration is successfully completed.

• Log in and check the HA Configuration under Settings >> HA settings.

• Configure the Elastic load balancer. For the Load balancer configuration in ScaleArc refer the following articles:
  • ScaleArc HA on AWS
  • ScaleArc HA on Azure

If you are experiencing issues with ScaleArc or with any of its features, please contact ScaleArc Support. We are available 24x7 by phone at 855 800 7225 or +1 408 412 7315.

For general support inquiries, you can also e-mail us at support@scalearc.com.