REST architectural style describes six constraints applied to architecture

  1. Uniform Interface  Individual resources are identified using URLS. The resources (database) are themselves different from the representation (XML, JSON, HTML) sent to the client. The client can manipulate the resource through the representations provided they have the permissions. Each...

Web API Best Practices

  Considering Top 10 Status 200 – OK – Everything is working201 – OK – New resource has been created204 – OK – The resource was successfully deleted 304 – Not Modified – The client can use cached data 400 – Bad Request – The request was invalid or cannot be served. The exact error should be explained in the error payload. E.g. „The JSON is not valid“401 – Unauthorized – The request requires...

Explain Elastic Block Storage? What type of performance can you expect? How do you back it up? How do you improve performance?

 How do you improve performance? EBS is a virtualized SAN or storage area network.  That means it is RAID storage to start with so it’s redundant and fault tolerant.  If disks die in that RAID you don’t lose data.  Great!  It is also virtualized, so you can provision and allocate...

What is S3? What is it used for? Should encryption be used?

S3 stands for Simple Storage Service.  You can think of it like ftp storage, where you can move files to and from there, but not mount it like a filesystem.  AWS automatically puts your snapshots there, as well as AMIs there.  Encryption should be considered for sensitive data, as S3...

What is an AMI? How do I build one?

AMI stands for Amazon Machine Image.  It is effectively a snapshot of the root filesystem.  Commodity hardware servers have a bios that points the the master boot record of the first block on a disk.  A disk image though can sit anywhere physically on a disk, so Linux can boot from an...