Security Groups
Security groups are an essential component of AWS networking and play a crucial role in controlling inbound and outbound traffic.
Inbound traffic refers to data that is being sent to an instance within a security group. By defining inbound rules, you can specify the protocols, ports, and IP addresses or CIDR blocks that are allowed to send data to your instances.
Outbound traffic refers to data that is being sent from an instance to external sources. Similarly, outbound rules allow you to define the protocols, ports, and IP addresses or CIDR blocks that your instances can communicate with.
Let's take a closer look at security groups with an example:
1const securityGroup = {
2 name: 'Web Server',
3 inboundRules: [
4 { protocol: 'TCP', port: 80, source: '0.0.0.0/0' },
5 { protocol: 'TCP', port: 443, source: '0.0.0.0/0' }
6 ],
7 outboundRules: [
8 { protocol: 'TCP', port: 22, destination: '0.0.0.0/0' }
9 ]
10};
In this example, we have a security group named Web Server. The inbound rules allow incoming TCP traffic on ports 80 and 443 from any source IP address (0.0.0.0/0). This means that the instances associated with this security group can receive HTTP and HTTPS requests from anywhere.
The outbound rule allows outgoing TCP traffic on port 22 (SSH) to any destination IP address (0.0.0.0/0). This allows the instances to initiate SSH connections to other servers.
Security groups provide a powerful mechanism for controlling incoming and outgoing traffic to your AWS resources. By defining the appropriate rules, you can ensure that your instances are accessible only to the necessary sources and can communicate with external services as required.
Next, we will explore another important networking component in AWS: Network Access Control Lists (NACLs).
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const securityGroup = {
name: 'Web Server',
inboundRules: [
{ protocol: 'TCP', port: 80, source: '0.0.0.0/0' },
{ protocol: 'TCP', port: 443, source: '0.0.0.0/0' }
],
outboundRules: [
{ protocol: 'TCP', port: 22, destination: '0.0.0.0/0' }
]
};