aws

Why CORS exists, how it works, and how to use it to properly setup cross-origin requests.

Discover how to setup Eureka in AWS ECS following an example project.

The first-in-first-out (FIFO) queue is the type of AWS SQS queue that guarantees order and provides exactly once delivery of messages. That sounds great, but there are some other important features to understand to avoid unexpected queue behaviour. In this article you’ll discover the 3 most important caveats with SQS FIFO queues. 1) If a message fails to be processed, it may block other messages When you send a message to a FIFO queue a message group id must be provided....

Using separate AWS accounts provides strong separation of resources, which is great until the point you need cross-account access from a VPC in one account to another. In this article you’ll learn 3 ways to setup a secure connection across accounts, with full working examples you can try out yourself. Why do we need cross-account VPC access? A Virtual Private Cloud (VPC) is a private network which you create in the AWS cloud....

AWS is the leading cloud provider with 32% of the market share. It offers highly available and cost effective services, so it’s no surprise companies are migrating from on-premises to AWS in droves. As developers, we’re often caught in the middle of this, being asked to re-architect software to new models such as containers or serverless. Sometimes the reasons for this seem unjustified given the huge changes required, but a lack of knowledge of AWS can hold you back from engaging in discussion....

Creating an S3 bucket is easy enough, but to apply the principle of least privilege properly we need to understand how to create the right permissions for specific IAM identities. This might be straightforward if it weren’t for the multiple ways to configure permissions in S3, each having its own rules and edge cases. This article helps you navigate this minefield, with details not only of how the S3 permissions work, but also how you can implement some common real-world scenarios such as S3 bucket access from another AWS account....

Discover how much Fargate Spot could save you on your AWS bill with this price comparison between 100 Fargate Spot and 100 Fargate containers. Did you know you could save money in AWS by switching from Fargate to Fargate Spot? If you’re using ECS, Fargate Spot offers significant cost reductions by using spare capacity in the AWS cloud. But just how much could you save? AWS say up to 70%, but we’re going to put that to the test with a head-to-head price comparison between 100 Fargate Spot and 100 Fargate containers running over 24 hours....

If you’ve ever deployed Spring Boot behind a load balancer, you might be aware of issues coming from differences between the request into the load balancer and the request into your application. These requests will often have a different protocol, host, or port. If Spring Boot isn’t correctly setup it can lead to all sorts of mayhem, such as generating incorrect URLs for you application. In this article you’ll discover how to make use of the X-Forwarded headers passed from a load balancer to your Spring Boot application, to help your application generate URLs correctly based on the originating request....

Let’s be honest, for most developers getting their software written and working on their own machine and maybe a test environment is the main priority. Deploying to production? Ah, that’s another team. All the AWS network ‘stuff’ - VPCs, subnets, gateways? Someone else’s business, right? Secondary to the contents of the holy Docker image and the beautiful code within. This couldn’t be further from the truth. The current trend is to developers owning their work all the way through from concept to production....