AWS - QnA


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AWS -EC2

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AWS - Security Groups

Security Group All inbound traffic is blocked by default. All outbound traffic is allowed. Changes to security group takes effect immediately. You can have any number of EC2 instances within a security group. Multiple security group attached to an EC2 instance. Security groups are STATEFUL (A service that is actively processing state data). You can not block specific IP address using security group instead use NACL. You can specify allow rules but not deny rules.
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AWS - Storage - Rebuild-InProgress

S3 S3 is object based storage on AWS cloud. Objects are files like videos, pictures etc. 0byte to 5TB size files can be uploaded. There is no limit on upload. Files are stored in buckets. S3 is universal namespace (two same name bucket can't exist globally), so each bucket name must be unique. S3 url syntax https://S3-<region name>.amazonaws.com/<bucketname>. Putting new object on S3 gives read after write consistency (no delay in read). For any update or deletion of object propagation of change will take time. S3 fundamentals are Key(name), Value(data), VersionID, Metadata, ACLs Write/Upload to S3 is notified by HTTP-200 message. Faster upload of larger files can be done using multipart upload tool. S3 storage classes/Tier S3 (durable, immediately available, frequently accessed). S3-IA (durable, immediately available, infrequently accessed). S3-Reduced redundancy object (data that can be quickly reproducible from backup, like thumbnail etc). Gl...
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