**To create a security group for EC2-Classic**

This example creates a security group named ``MySecurityGroup``.

Command::

  aws ec2 create-security-group --group-name MySecurityGroup --description "My security group"

Output::

  {
      "GroupId": "sg-903004f8"
  }

**To create a security group for EC2-VPC**

This example creates a security group named ``MySecurityGroup`` for the specified VPC.

Command::

  aws ec2 create-security-group --group-name MySecurityGroup --description "My security group" --vpc-id vpc-1a2b3c4d

Output::

  {
      "GroupId": "sg-903004f8"
  }

For more information, see `Using Security Groups`_ in the *AWS Command Line Interface User Guide*.

.. _`Using Security Groups`: http://docs.aws.amazon.com/cli/latest/userguide/cli-ec2-sg.html