Cogini Blog
Featured articles
Deploying an Elixir app to Digital Ocean with mix_deploy Port forwarding with iptables
Running Ecto migrations in production releases with Distillery custom commands
In a dev or test environment, we execute the mix ecto.migrate command to run database migrations. When running from a release, the mix command is not available, so we execute Ecto.Migrator.run/4 from code via a Distillery custom command command. Read more…
Tuning TCP ports for your Elixir app
Elixir is great at handling lots of concurrent connections. When you actually try to do this, however, you will bump up against the default OS configuration which limits the number of open filehandles/sockets. You may also run out of TCP ephemeral ports. Read more…
Configure ssh to connect to a server
How to configure ssh to connect to a server using an ssh key for access Read more…
Using ASDF with Elixir and Phoenix
The ASDF version manager lets us manage multiple versions of Erlang, Elixir and Node.js. It is a language-independent equivalent to tools like Ruby's RVM or rbenv. Read more…
Running a local caching DNS for your app
When your app is acting as a proxy to back end servers, DNS can become a bottleneck. Running a local caching DNS server on the app server machine speeds up performance. Read more…
Creating an ssh key
How to create an ssh key for beginners Read more…
Elixir and embedded programming presentation
Here are the slides for the presentation on Elixir and embedded programming I gave to the Elixir LA user's group. It introduces embedded programming and how Elixir is a good match for a new generation of embedded systems. Read more…
Running Nerves on Amazon EC2
I have been looking into the best way to deploy Elixir in the cloud. As part of that, I have been building various AMIs with only the minimum needed to run an Elixir app. Nerves is a framework for building embedded systems in Elixir. Instead of running a general purpose … Read more…
Servers for beginners
Spinning up a server is easy enough, just go to Digital Ocean and push a button. But now you are responsible for your server. What does that mean? Read more…
The impact of network latency, errors, and concurrency on benchmarks
The goal of benchmarking is to understand the performance of our system and how to improve it. When we are making benchmarks, we need to make sure that they match real world usage. In my post on Benchmarking Phoenix on Digital Ocean, changing the concurrent connections and network latency had … Read more…