Cogini Blog Articles tagged elixir
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Deploying an Elixir app to Digital Ocean with mix_deploy
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…
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…
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…
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…
Managing app secrets with Ansible
In web applications we usually have a few things that are sensitive, e.g. the login to the production database or API keys used to access a third party API. We need to be particularly careful about how we manage these secrets, as they may allow attackers to access data … Read more…
Deploying your Phoenix app to Digital Ocean for beginners
This is a gentle introduction to getting your Phoenix app up and running on a $5/month server at Digital Ocean. It starts from zero, assuming minimal experience with servers. Read more…
Benchmarking Phoenix on Digital Ocean
Just for fun, I decided to benchmark the performance of the elixir deploy template running on a $5/month Digital Ocean Droplet. Read more…
Avoiding GenServer bottlenecks
GenServers are the standard way to create services in Elixir. They are very useful, but when used incorrectly they can cause unnecessary problems. This is particularly an issue for developers coming from object oriented languages, who attempt to treat GenServers as object instances. Instead we should think in functional terms … Read more…