This article talks about Roost default behaviour and allowed overrides from the user while requesting Roost cluster on AWS.
1. VPC :
Amazon VPC is the networking layer for Amazon EC2. A default VPC (public VPC) is automatically created for your AWS account the first time you provision Amazon EC2 resources. New instances are launched in the default VPC.
Roost looks for the default VPC and uses it, unless the user has specified a VPC.
2. Subnets:
A subnet, or subnetwork, is a network inside a network.
Roost looks for a default subnet, and creates one unless found, with CIDR block (specified as "172.31.16.0/20") for the Availability Zone such as “ap-south-1b”.
3. Security Group:
A security group is like a virtual firewall. Roost creates a security group named “roost-community”.
Inbound TCP traffic is configured for ports [22, 60001, 60002, 60003, 60004, 60005, 6443, 80, 5000, 5002, 5004, 5005, 30000 - 32767, 62020-62050 ].
4. Key-Pair:
A key pair is a combination of a public key that is used to encrypt data and a private key that is used to decrypt data.
Roost creates a unique key pair with the name as roost_<ClusterID> for the EC2 nodes associated with the Cluster.
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