Cogini Blog Articles in the DevOps category

Jake Morrison

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…

Jake Morrison

Configure ssh to connect to a server

How to configure ssh to connect to a server using an ssh key for access Read more…

Jake Morrison

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…

Jake Morrison

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…

Jake Morrison

Creating an ssh key

How to create an ssh key for beginners Read more…

Jake Morrison

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…

Jake Morrison

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…

Jake Morrison

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…

Jake Morrison

Improving app security with the principle of least privilege

The security principle of "least privilege" means that apps should only have the permissions that they need to do their job, nothing more. If an attacker compromises your app, then they can't do anything outside of what the app would normally do. They may be able to break the application … Read more…

Jake Morrison

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…


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