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VPC, subnets and Availability Zones

Configure your AWS VPC to integrate Qlik within your environment.

A Virtual Private Cloud (VPC) is a logically isolated network that enables you to control how AWS resources, such as databases and compute instances, connect to each other and the internet. Each VPC is created within a single AWS region.

Subnets are subdivisions of a VPC used to organize and host resources such as Amazon EC2 instances. Subnets can be:

  • Public: Allow direct access to the internet.

  • Private: Restricted to internal communication within the VPC.

Each subnet is created within a specific Availability Zone. For example, in the us-east-1 region, you can create subnets in us-east-1a, us-east-1b, and us-east-1c.

Availability Zones (AZs) are physically isolated data centers within a region. Distributing resources across multiple AZs improves application availability and fault tolerance. It is a best practice to provision resources across at least two Availability Zones to ensure high availability and fault tolerance.

Information noteSubnets created in the VPC configuration must have a valid route that provides outbound internet access. If the subnet is not public, a private subnet should allow outbound access via a NAT/internet gateway.

The relationship between the VPC, subnets, and AZs, ensures that:

  • A VPC is scoped to a single AWS region and spans all Availability Zones within that region.

  • Subnets are bound to individual Availability Zones, providing the ability to distribute resources across zones.

  • You can use this structure to deploy resources across multiple AZs within a VPC to enhance availability and resilience.

Creating a VPC

To create your VPC, do the following:

  1. In the AWS console, go to VPC, Your VPCs.

  2. Click Create VPC and configure it:

    • Resources to create: Select VPC and more.

    • Number of Availability Zones: Click on the number you require.

    • Number of public subnets: Set the required number of subnets.

    • Number of private subnets: Ensure the value is set to 0.

    For each subnet, ensure the parameter Auto-assign public IPv4 address is set to Yes.

  3. Click Create VPC.

    When the VPC has been created, the list of entities is shown.

  4. Make a note of the VPC ID, and CIDR range of the VPC.

  5. Make a note of subnet IDs that were created.

  6. Click each subnet to discover its Availability Zone, and make a note. 

You should now have:

  • A VPC ID.

  • The CIDR range of the VPC

  • The list of subnets and the Availability Zone of each subnet.

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