http://ec2.{region}.amazonaws.com/#Action=CreateSecurityGroup<p>Creates a security group.</p> <p>A security group acts as a virtual firewall for your instance to control inbound and outbound traffic. For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-network-security.html">Amazon EC2 security groups</a> in the <i>Amazon Elastic Compute Cloud User Guide</i> and <a href="https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_SecurityGroups.html">Security groups for your VPC</a> in the <i>Amazon Virtual Private Cloud User Guide</i>.</p> <p>When you create a security group, you specify a friendly name of your choice. You can have a security group for use in EC2-Classic with the same name as a security group for use in a VPC. However, you can't have two security groups for use in EC2-Classic with the same name or two security groups for use in a VPC with the same name.</p> <p>You have a default security group for use in EC2-Classic and a default security group for use in your VPC. If you don't specify a security group when you launch an instance, the instance is launched into the appropriate default security group. A default security group includes a default rule that grants instances unrestricted network access to each other.</p> <p>You can add or remove rules from your security groups using <a>AuthorizeSecurityGroupIngress</a>, <a>AuthorizeSecurityGroupEgress</a>, <a>RevokeSecurityGroupIngress</a>, and <a>RevokeSecurityGroupEgress</a>.</p> <p>For more information about VPC security group limits, see <a href="https://docs.aws.amazon.com/vpc/latest/userguide/amazon-vpc-limits.html">Amazon VPC Limits</a>.</p> <note> <p>We are retiring EC2-Classic. We recommend that you migrate from EC2-Classic to a VPC. For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/vpc-migrate.html">Migrate from EC2-Classic to a VPC</a> in the <i>Amazon Elastic Compute Cloud User Guide</i>.</p> </note>
{
"success": true,
"data": {
"id": "abc123",
"created_at": "2025-01-01T00:00:00Z"
}
}{
"success": false,
"error": {
"code": "VALIDATION_ERROR",
"message": "Invalid request parameters"
}
}1curl --request POST \2 --url 'http://ec2.{region}.amazonaws.com/#Action=CreateSecurityGroup' \3 --header 'accept: application/json' \4 --header 'content-type: application/json'1{2 "success": true,3 "data": {4 "id": "abc123",5 "created_at": "2025-01-01T00:00:00Z"6 }7}http://ec2.{region}.amazonaws.com/#Action=CreateSecurityGroup<p>Creates a security group.</p> <p>A security group acts as a virtual firewall for your instance to control inbound and outbound traffic. For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-network-security.html">Amazon EC2 security groups</a> in the <i>Amazon Elastic Compute Cloud User Guide</i> and <a href="https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_SecurityGroups.html">Security groups for your VPC</a> in the <i>Amazon Virtual Private Cloud User Guide</i>.</p> <p>When you create a security group, you specify a friendly name of your choice. You can have a security group for use in EC2-Classic with the same name as a security group for use in a VPC. However, you can't have two security groups for use in EC2-Classic with the same name or two security groups for use in a VPC with the same name.</p> <p>You have a default security group for use in EC2-Classic and a default security group for use in your VPC. If you don't specify a security group when you launch an instance, the instance is launched into the appropriate default security group. A default security group includes a default rule that grants instances unrestricted network access to each other.</p> <p>You can add or remove rules from your security groups using <a>AuthorizeSecurityGroupIngress</a>, <a>AuthorizeSecurityGroupEgress</a>, <a>RevokeSecurityGroupIngress</a>, and <a>RevokeSecurityGroupEgress</a>.</p> <p>For more information about VPC security group limits, see <a href="https://docs.aws.amazon.com/vpc/latest/userguide/amazon-vpc-limits.html">Amazon VPC Limits</a>.</p> <note> <p>We are retiring EC2-Classic. We recommend that you migrate from EC2-Classic to a VPC. For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/vpc-migrate.html">Migrate from EC2-Classic to a VPC</a> in the <i>Amazon Elastic Compute Cloud User Guide</i>.</p> </note>
{
"success": true,
"data": {
"id": "abc123",
"created_at": "2025-01-01T00:00:00Z"
}
}{
"success": false,
"error": {
"code": "VALIDATION_ERROR",
"message": "Invalid request parameters"
}
}1curl --request POST \2 --url 'http://ec2.{region}.amazonaws.com/#Action=CreateSecurityGroup' \3 --header 'accept: application/json' \4 --header 'content-type: application/json'1{2 "success": true,3 "data": {4 "id": "abc123",5 "created_at": "2025-01-01T00:00:00Z"6 }7}