Articles for the Cloud-Native Software Engineer

How to set up a Private Docker Registry using AWS S3

Go through the process of creating a Terraform configuration for deploying a Docker registry to an instance making use of IAM roles.
Blocking EC2 Metadata service from Docker containers in AWS

Check out how to make sure Docker containers running in AWS are unnable to access the EC2 metadata service.
How to set up AWS EFS across multiple availability zones using Terraform

Having an AWS EFS file system over multiple availability zones using Terraform is not complicated. Check out one way of doing it.

Blocking ingress traffic to Docker swarm worker machines

Once a Docker Swarm Mode cluster is formed, all nodes participate in the routing mesh and accept ingress traffic. Check out how to block that feature.
How to set up a Private Docker Registry using AWS S3

Go through the process of creating a Terraform configuration for deploying a Docker registry to an instance making use of IAM roles.
Retrieving Docker Registry metrics using Prometheus

Docker registry used not to have a Prometheus exporter by default. Check out how to make use of it in the development branch.

A UDP server and client in Go

Getting from Golang's net package down to the Linux kernel methods invoked when UDP messages are sent.
Retrieving the full path of a process on MacOS (and exploring procfs)

Getting the absolute path of process on a MacOS machine might not be as simple as in Linux.
How to minify and bundle assets using Hugo

Hugo Pipes arrived - asset post-processing is now built directly into Hugo. Check out how I made use of CSS minification and bundling to render AMP pages better

Using HAProxy maps with Access control lists (acl)

HAProxy frontends can have their logic simplified by using maps. Check out how to tie maps with ACLs to improve routing.
Making HAProxy respond 200 OK to health checks

Sometimes you need HAProxy to have a special frontend to return 200 OK when a request is made for health-checking purposes. Check out three ways of doing it.
Replacing HAProxy ACLs by HAProxy Maps

HAProxy maps can reduce the complexity of haproxy configurations by allowing you to define map lookup logic. Check out how to remove ACLs in favor of maps.

A Raspberry PI Concourse Worker

Lessons learned building Concourse workers for ARM - a visit to CGO cross compilation, and necessary modifications to the workers' runtime
How Linux creates sockets and counts them

A deep dive into what goes under the hood in the Linux kernel when you can the socket system call
Using /proc to get a process' current stack trace

Check out how you can use the proc filesystem to retrieve the kernel stack trace of a given process

How Linux creates sockets and counts them

A deep dive into what goes under the hood in the Linux kernel when you can the socket system call
A UDP server and client in Go

Getting from Golang's net package down to the Linux kernel methods invoked when UDP messages are sent.
Blocking ingress traffic to Docker swarm worker machines

Once a Docker Swarm Mode cluster is formed, all nodes participate in the routing mesh and accept ingress traffic. Check out how to block that feature.

Retrieving the full path of a process on MacOS (and exploring procfs)

Getting the absolute path of process on a MacOS machine might not be as simple as in Linux.
Passing the results of a command as a file to another script

Bash process substitution can make you not depend on processes expecting input from the standard input. Learn how to supply the result of a script as a temporary filename for another command.
How to minify and bundle assets using Hugo

Hugo Pipes arrived - asset post-processing is now built directly into Hugo. Check out how I made use of CSS minification and bundling to render AMP pages better

Passing the results of a command as a file to another script

Bash process substitution can make you not depend on processes expecting input from the standard input. Learn how to supply the result of a script as a temporary filename for another command.
Measuring HTTP response times with cURL

Without getting out of your current shell and installing other utilities, give cURL a try to measure response times - it can do it.
Shell: replacing a variable with the contents of a file

How to create a poor man's templating engine using AWK

Notes from learning to build stuff.