Category: Chocolate Box

Acronym

Amazon Web Services In Plain English

  •  VPC
    • Amazon Virtual Private Cloud (Amazon VPC) lets you provision a logically isolated section of the AWS Cloud where you can launch AWS resources in a virtual network that you define. You have complete control over your virtual networking environment, including selection of your own IP address range, creation of subnets, and configuration of route tables and network gateways. You can use both IPv4 and IPv6 in your VPC for secure and easy access to resources and applications.You can easily customize the network configuration for your Amazon VPC. For example, you can create a public-facing subnet for your web servers that has access to the Internet, and place your backend systems such as databases or application servers in a private-facing subnet with no Internet access. You can leverage multiple layers of security, including security groups and network access control lists, to help control access to Amazon EC2 instances in each subnet.
    • Typical use case for VPC: Keeping publicly accessible web servers in public subnets and database servers in private ones, and enabling a secure connection between cloud resources and on-premise machines.
    • For each VPC, you need to specify a CIDR block range of IP addresses used.
    • Creating a VPC is not enough: to be able to place instances in this network, we also need a subnet. This subnet belongs to a previously created VPC. This means that we have to pass a VPC ID when we create it. We don’t have to hardcode it though. Terraform, via interpolation syntax, allows us to reference any other resource it manages using the following syntax: ${RESOURCE_TYPE.RESOURCE_NAME.ATTRIBUTE_NAME}.
  • AMI
    • An Amazon Machine Image (AMI) provides the information required to launch an instance. You must specify an AMI when you launch an instance. You can launch multiple instances from a single AMI when you need multiple instances with the same configuration. You can use different AMIs to launch instances when you need instances with different configurations.