Source code of The Erlangelist blog
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This repository contains the complete source code of The Erlangelist site:


If you want to contribute a minor correction to some article (e.g. language and grammar fixes) just make a pull request to the master. If you'd like to make a bigger change, please open a GitHub issue first.

Running the site locally


  • Erlang 20
  • Elixir 1.6

Optional dependencies are openssl and certbot. It they're missing, you might see some errors, but the site will be working.


  1. Go to the site folder and fetch mix dependencies
  2. From the site folder start the site with iex -S mix phoenix.server

If all went well, the server will listen on the port 20080.

If you have openssl and certbot, the server will self-certify, and also accept https traffic on port 20443.

Deploying to the production server

Note: Don't deploy to a machine where you run some other system, or which is of some other importance to you. Setup script installs some packages and changes the system configuration (e.g. creates a user, modifies iptables rules, ...).

Server prerequisites

The target host must run Debian 8 and needs to have sudo installed. It also needs the Internet access, because various packages, docker images, and other dependencies are fetched during the initial setup and subsequent deploys.

There is a support available for starting a local Vagrant box that can act as a "staging" server. You need to first run cd provisioning/vagrant && VM_IP= vagrant up to start the server with a given IP address (feel free to use another IP address).

Client prerequisites

On your machine you need bash, ansible, and a git client. You also need to configure automatic passwordless ssh login to the server machine (under a login that has sudo privilege).

If you started a local Vagrant box, as explained above, you can run cd provisioning/vagrant && vagrant ssh-config --host ip_of_the_vm to get the ssh configuration for your server.

Filling in the blanks

You need to create provisioning/git_keys folder that must contain public keys of all allowed deployers.

Initial setup

This step installs required packages and sets up the system. You can run provisioning/ server_ip network_interface, where network interface is the name of the interface which accepts the requests from the outer world (for example eth0).

For example, to set up a local VM with an IP address, you can run provisioning/ eth1.

Setting up the git remote

The deploy is performed by pushing to the git repository on the remote server. During the setup, the git user is created on the server. You can login as a git with any of the keys supplied in provisioning/git_keys folder, as explained above.

In your local git repository, you need to add another remote which will be the deploy target. For example:

git remote add local_deploy git@


If all things are properly configured, you can simply deploy the site via

git push local_deploy master

The first push will run for some time, because it builds all the docker images from scratch. Once everything is done, the site should be listening at the port 80.