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AWS Network Topology/Architecture

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AWS Network Topology/Architecture

  1. 1. AWS Network Architecture Simpl(est) way to guarantee uptime.
  2. 2. Terms – Regions & Availability Zones  AZ is the standard abbreviation for Availability Zone.  From Amazon: Amazon EC2 is hosted in multiple locations world-wide. These locations are composed of regions and Availability Zones. Each region is a separate geographic area. Each region has multiple, isolated locations known as Availability Zones. Amazon EC2 provides you the ability to place resources, such as instances, and data in multiple locations. Resources aren't replicated across regions unless you do so specifically.  RDS & S3 support multi AZ natively (but NOT multi region).  VPC’s are multi AZ but NOT multi region. AZ Region Availability Zone
  3. 3. Terms – Virtual Private Cloud  VPC is the standard abbreviation for Virtual Private Cloud.  From Amazon: Amazon Virtual Private Cloud (Amazon VPC) lets you provision a logically isolated section of the Amazon Web Services (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.  Can have public and private subnets, we’ll just be using private which means no internet access in or out.  Used to:  Create our own private network inaccessible from the internet.
  4. 4. Terms – Internet Gateway/Router  From Amazon: By default, instances that you launch into a virtual private cloud (VPC) can't communicate with the Internet. You can enable access to the Internet from your VPC by attaching an Internet gateway to the VPC, ensuring that your instances have a public IP address, creating a custom route table, and updating your security group rules.  Like a ‘hardware’ firewall/router, just software based and easily configured.  Used To:  Internet Gateway allows public routing of any public IP addresses and load balancers inside the VPC.  Router (or routing rules) allow traffic to be directed where it should/can go, usually be subnets. Internet Gateway Router
  5. 5. Terms – VPC Peering  From Amazon: A VPC peering connection is a networking connection between two VPCs that enables you to route traffic between them using private IP addresses. Instances in either VPC can communicate with each other as if they are within the same network. You can create a VPC peering connection between your own VPCs, or with a VPC in another AWS account within a single region.  Must have a route table entry directing traffic through the Peering Connection for the intended IP range.  Used to:  Connect the Web/App Server VPC to the RDS VPC.
  6. 6. Terms – Elastic Load Balancer  ELB is the standard abbreviation for Elastic Load Balancer.  From Amazon: Elastic Load Balancing automatically distributes your incoming application traffic across multiple Amazon EC2 instances. It detects unhealthy instances and reroutes traffic to healthy instances until the unhealthy instances have been restored. Elastic Load Balancing automatically scales its request handling capacity in response to incoming traffic.  Used to:  Distribute network load between multiple availability zones.  Distribute network load between multiple machines in one availability zone.
  7. 7. Terms – Elastic IP  EIP is the standard abbreviation for Elastic IP.  From Amazon: An Elastic IP address (EIP) is a static IP address designed for dynamic cloud computing. With an EIP, you can mask the failure of an instance or software by rapidly remapping the address to another instance in your account. Your EIP is associated with your AWS account, not a particular instance, and it remains associated with your account until you choose to explicitly release it.  Is just a reusable static IP.  Used to:  Create external DNS accessible routing.  Allows public internet access.
  8. 8. Terms – Bastion Instance  From Wikipedia: A Bastion host is a special purpose computer on a network specifically designed and configured to withstand attacks. The computer generally hosts a single application, for example a proxy server, and all other services are removed or limited to reduce the threat to the computer. It is hardened in this manner primarily due to its location and purpose, which is either on the outside of the firewall or in the DMZ and usually involves access from untrusted networks or computers.  Is just another EC2 Instance running software.  Used to:  Allow software VPN tunnels from developers/administrators access.  Allow multiple regions to be connected via a live tunnel.
  9. 9. Terms – NAT Instance  NAT stands for Network Address Translation (your router at home does this).  From Amazon: Instances that you launch into a private subnet in a virtual private cloud (VPC) can't communicate with the Internet. You can optionally use a network address translation (NAT) instance in a public subnet in your VPC to enable instances in the private subnet to initiate outbound traffic to the Internet, but prevent the instances from receiving inbound traffic initiated by someone on the Internet.  Is just another EC2 Instance running software.  Used to:  Allow computers inside the private subnet to connect to the internet and resources like S3 that are routed in public space. NAT
  10. 10. Terms - Subnet  From Wikipedia: A subnetwork, or subnet, is a logically visible subdivision of an IP network. The practice of dividing a network into two or more networks is called subnetting. … Traffic between subnetworks is exchanged or routed with special gateways called routers which constitute the logical or physical boundaries between the subnets.  Essentially divide the IP addresses of computers to make rules for where traffic should/can go easy to program.  ‘Public’ subnets are visible from the internet, ‘Private’ ones are not.  Used to:  Easily route traffic correctly (like outbound traffic through the NAT instance).
  11. 11. region Web App Web App Multiple Region Network Topology Network Ingress Network Egress Network Backchannel Network IPSEC Tunnel Network Tunneled Connection Internet Read/ Write Read Region (us-west-1) Region (us-east-1) NAT NAT
  12. 12. NAT NAT App Finer Grain Single Region Multi AZ Topology Internet AZ - us-west-1a Region (us-west-1) AZ - us-west-1b Network Ingress Network Egress Network Backchannel Network IPSEC Tunnel Network Tunneled Connection AZ = Availability Zone App Web Tunnel to other region S3 is already Multi AZ… Web
  13. 13. Finer Grain Single AZ Multi Subnet Topology NAT App Internet AZ - us-west-1a Region (us-west-1) Network Ingress Network Egress Network Backchannel Network IPSEC Tunnel Network Tunneled Connection AZ = Availability Zone Web Tunnels to other AZs and regions Private (WEB) Public (NAT) Public (ELB) Public (VPN) Private (APP) Peering to RDS VPC
  14. 14. Resources  Terms:  Regions & Availability Zones: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using- regions-availability-zones.html  Virtual Private Cloud: http://aws.amazon.com/vpc/  Internet Gateway: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Internet_Gateway.html  Elastic Load Balancer: http://aws.amazon.com/documentation/elasticloadbalancing/  Elastic IP: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ip-addresses-eip.html  Bastion Instance: http://en.wikipedia.org/wiki/Bastion_host  NAT Instance: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_NAT_Instance.html  Subnet: http://en.wikipedia.org/wiki/Subnetwork and http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Scenario2.html  Author: Lawson Caudill – http://www.getthinktank.com

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