---
title: "About Deploying a vNIOS for AWS Instance with High Availability"
canonical: "https://docs.infoblox.com/space/NAIG/1867448335/About%20Deploying%20a%20vNIOS%20for%20AWS%20Instance%20with%20High%20Availability"
format: markdown
---
Starting from NIOS 9.0.4, vNIOS for AWS supports deploying instances in a high availability (HA) setup. vNIOS instances identified as node1 and node2 can be configured as an HA (high availability) pair in an active/passive configuration to provide hardware redundancy for core network services. For more information, refer to the *About HA Pairs* topic in the *[Infoblox NIOS Documentation](https://docs.infoblox.com)*.

This topic summarizes the steps that you need to perform to deploy an instance with HA.

1. Consider the limitations listed in the following sections in topic, *[Limitations of vNIOS for AWS](https://infoblox-docs.atlassian.net/wiki/spaces/NAIG/pages/1487634463)*:
  - *Common Limitations*
  - *Limitations Specific to HA*
2. Complete the HA-specific *[prerequisites](https://infoblox-docs.atlassian.net/wiki/spaces/NAIG/pages/636354593)* in which you will:
  - Create a VPC and subnets for deploying the vNIOS instances.
  - Define an IAM role for HA that you will attach to the vNIOS instance.
3. Provision an instance each for node 1 and node 2 in AWS and set them up for HA as described in one of the following topics according to the licensing model:  
*[Provisioning vNIOS for AWS Using the BYOL Model](https://infoblox-docs.atlassian.net/wiki/spaces/NAIG/pages/37650793)* if you are using the BYOL model for licensing  
*[Provisioning the PayGo instance of vNIOS for AWS](https://infoblox-docs.atlassian.net/wiki/spaces/NAIG/pages/880115730)* if you are using the PayGo model for licensing  
High-level steps that you perform when provisioning an instance are:
  1. Obtaining the vNIOS for AWS AMI
  2. Defining an AWS Instance Security Group
  3. Defining Advanced Network Configuration for HA
  4. Defining Storage Settings for the vNIOS for AWS Instance
  5. Initializing vNIOS for AWS Instances with the AWS User Data Field
  6. Attaching an IAM role to the Instance
4. After deploying vNIOS instances in AWS, complete the following in NIOS Grid Manager:
  1. Configure a DNS resolver in the *Grid Properties Editor*.  
For more information, refer to the *Enabling DNS Resolution* topic in the *[Infoblox NIOS Documentation](https://docs.infoblox.com/space/NIOS/35400616/NIOS)*.  
The resolver must be able to reach the following AWS endpoints:
    - For AWS global regions:
      - https://iam.amazonaws.com/
      - https://ec2.<*region*>.amazonaws.com/
    - For China:
      - https://iam.amazonaws.com.cn/
      - https://ec2.<*region*>.amazonaws.com.cn/
  2. Set up NIOS for HA.  
According to the type of members you are setting up in NIOS, refer to the topics *HA Master - Node 1* and/or *Adding an HA Member* in chapter *Deploying a Grid* in the *[Infoblox NIOS Documentation](https://docs.infoblox.com/space/NIOS/35400616/NIOS)*.  
**Note**:  
Ensure that the time on the HA nodes in NIOS is synchronized with the local time.  
You can configure NTP servers on the vNIOS appliance and enable the NTP service to synchronize time on the appliance. For information about how to set up the NTP server, refer to the* **[Infoblox NIOS Documentation](https://docs.infoblox.com/)*.