How to manage Lambda log groups with Terraform

21 January 2020, Tamás Sallai
Lambda automatically creates all log resources when a function is created which enables permanent logging even if you do nothing special to enable it. This is convenient as logging is an essential debugging tool, and you don’t want to realize you don’t have any records when you need them.

Using external libraries in JShell

14 January 2020, Dávid Csákvári
After I’ve experimented with JShell to solve mathematical puzzles with the Java’s Standard Library, I set out to use it for two other use cases: investigate external libraries, and use the REPL experiment with classes defined in a project.

How to solve CORS problems when redirecting to S3 signed URLs

07 January 2020, Tamás Sallai
The implementation of signed URLs on the frontend usually uses a 2-phase fetch. First, there is a request to the backend, asking to sign an S3 URL. Then a separate request is sent to the bucket to fetch the file.

How to integrate PlantUML into other software

31 December 2019, Tamás Sallai
I like text-based image generation for illustrating a point in an article. And I’ve found that putting images, any type of image, to break the text flow helps a lot with understanding. Even when I see some cat pictures strewn over it helps to avoid the wall-of-text effect. But why stop at unrelated cat pictures?
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CloudFormation CLI workflows
Despite my ambivalent feeling about CloudFormation I use it a lot, but managing stacks through the Console is a pain. Fortunately, this service enjoys the same CLI support most other ones do, so it is just a matter of scripting to make it more developer-friendly.
AWS: How to secure access keys with MFA
One of the most catastrophic of the AWS account security breaches is not sophisticated hacking involving 0-day vulnerabilities traded on the deep web by high-profile hackers. It is when you post your access and secret keys in plain text to the public. After all, it’s so easy to test with some hard-coded keys and accidentally push it to the VCS.
A categorized list of all Java and JVM features since JDK 8
Since the release of version 8, up to version 11, Java is shaped by 120 JDK Enhancement Proposals (JEPs), each of which brings some improvement to the platform. I’ve decided to read them and create a concise, categorized list from the improvements.
How to use S3 signed URLs with CloudFront
S3 signed URLs provide fine control over who can access private resources. It is flexible regarding both the permission side and also on the ease of automation.