Tools and APIs
Below we highlight the most relevant command-line tools and SOAP API calls used to manipulate
security groups. Please refer to the appropriate sections of this guide for the specific details.
Purpose Command-line tool SOAP API
List the rules belonging to spe-
cified groups
ec2-describe-group DescribeSecurityGroups
Create a new security group ec2-add-group CreateSecurityGroup
Delete an existing security
group
ec2-delete-group DeleteSecurityGroup
Add an access rule to an existing
security group
ec2-authorize AuthorizeSecurityGroupIngress
Remove an access rule from an
existing security group
ec2-revoke RevokeSecurityGroupIngress
Amazon EC2
Developer Guide
19
Using Instances
The instance is your basic computation building block. It is a medium-sized host that provides you with
the same predictable performance you would expect from a physical host. You can run on as many or as
few as you need at any given time. Each instance predictably provides the equivalent of a system with a
1.7Ghz Xeon CPU, 1.75GB of RAM, 160GB of local disk, and 250Mb/s of network bandwidth.
Once launched, an instance looks very much like a traditional host. You have complete control of your
instances. You have root access to each one, and you can interact with them as you would any machine.
Amazon EC2
Developer Guide
20
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