fix minor typos (#3974)
* 📝 fix : typos
* Update 101-anti-corruption-layer.md
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Co-authored-by: Arik Chakma <arikchangma@gmail.com>
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# App Changes for AWS |
# App Changes for AWS |
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While a lot of applications can probably just be deployed to an EC2 instance and work well, if you're coming from a physical environment, you may need to re-architect your application in order to accomodate changes. Don't just think you can copy the files over and be done with it. |
While a lot of applications can probably just be deployed to an EC2 instance and work well, if you're coming from a physical environment, you may need to re-architect your application in order to accommodate changes. Don't just think you can copy the files over and be done with it. |
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# Use Official SDKs |
# Use Official SDKs |
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> If you need to interact with AWS, use the SDK for your langauge. |
> If you need to interact with AWS, use the SDK for your language. |
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Don't try to roll your own, I did this at first as I only needed a simple upload to S3, but then you add more services and it's just an all around bad idea. [The AWS SDKs](http://aws.amazon.com/tools/) are well written, handle authentication automatically, handle retry logic, and they're maintained and iterated on by Amazon. Also, if you use EC2 IAM roles (which you absolutely should, more on this later) then the SDK will automatically grab the correct credentials for you. |
Don't try to roll your own, I did this at first as I only needed a simple upload to S3, but then you add more services and it's just an all around bad idea. [The AWS SDKs](http://aws.amazon.com/tools/) are well written, handle authentication automatically, handle retry logic, and they're maintained and iterated on by Amazon. Also, if you use EC2 IAM roles (which you absolutely should, more on this later) then the SDK will automatically grab the correct credentials for you. |
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# Use VPC |
# Use VPC |
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Setting up a VPC seems like a pain at first, but once you get stuck in and play with it, it's suprising easy to set up and get going. It provides all sorts of extra features over EC2 that are well worth the extra time it takes to set up a VPC. First, you can control traffic at the network level using ACLs, you can modify instance size, security groups, etc. without needing to terminate an instance. You can specify egress firewall rules (you cannot control outbound traffic from normal EC2). But the biggest thing is that you have your own private subnet where your instances are completely cut off from everyone else, so it adds an extra layer of protection. |
Setting up a VPC seems like a pain at first, but once you get stuck in and play with it, it's surprising easy to set up and get going. It provides all sorts of extra features over EC2 that are well worth the extra time it takes to set up a VPC. First, you can control traffic at the network level using ACLs, you can modify instance size, security groups, etc. without needing to terminate an instance. You can specify egress firewall rules (you cannot control outbound traffic from normal EC2). But the biggest thing is that you have your own private subnet where your instances are completely cut off from everyone else, so it adds an extra layer of protection. |
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If you're interested in the internals of VPC, I highly recommend watching [A Day in the Life of Billion Packets](http://www.youtube.com/watch?v=Zd5hsL-JNY4) ([Slides](https://www.slideshare.net/AmazonWebServices/a-day-in-the-life-of-a-billion-packets-cpn401-aws-reinvent-2013)). |
If you're interested in the internals of VPC, I highly recommend watching [A Day in the Life of Billion Packets](http://www.youtube.com/watch?v=Zd5hsL-JNY4) ([Slides](https://www.slideshare.net/AmazonWebServices/a-day-in-the-life-of-a-billion-packets-cpn401-aws-reinvent-2013)). |
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