Amazon Web Services For Dummies by Bernard Golden

Author:Bernard Golden [Golden Bernard]
Language: eng
Format: epub, pdf
ISBN: 9781118651988
Publisher: Wiley
Published: 2015-02-12T00:00:00+00:00

When launching a server in the Business Logic tier, attach the BusinessLogicSecurityGroup. Because this security group has been configured to accept traffic from instances in the WebTierSecurityGroup, it can send and receive traffic from the web instances in the application without being exposed to port 80 traffic.

When you launch a server in the Data tier, attach DatabaseSecurityGroup to it. Because the DatabaseSecurityGroup was configured to accept traffic from any instance that is a member of the BusinessLogicSecurityGroup, any Data tier instance will be able to communicate with instances in the Business Logic tier. Note that by not having made the DatabaseSecurityGroup accept traffic from the WebTierSecurityGroup, these instances aren’t accessible from the public Internet, even though they have a public IP address; any attempt to send HTTP traffic to one of these instances is rejected because it doesn’t have that port open.

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