My co-worker Gerhard put together the following - The new changelog.com setup for 2019

It goes into great detail about how changelog.com is deployed. The entire deployment code is open-source as well.

There have been several ElixirConf talks about this which would probably answer most of your questions … I like this one in particular: Tian Chen - Release, Deploy, Monitor and Upgrade Elixir Services in Real World - Code BEAM SF 2018

There are two parts to deployment.

1. Bundle the data needed to be pushed to your servers
   In Elixir/Erlang usually you build an otp release to be deployed. There is documentation for mix release in elixir 1.9 and also quite a bunch of documentation around distillery. In erlang I’m not sure which tool would create the release, but it’s a similar process.
2. Getting said data to the server and running it on there.
   This part is actually hardly specific to elixir/erlang at all, there are a few requirements to releases (same architecture/os/native libraries where the release is build and deployed), but other than that it can be as simple as sftp’ing the release to the server or wrapping it in a docker file and using k8s to move it to the servers it should run on. Starting the release is actually just calling a binary with a command of how you’d like to run the release (daemonized vs in foreground). Those commands are also well documented.
3. (Extra)
   Erlang Clustering: You can find a chapter on how it works in Designing for Scalability with Erlang/OTP. There’s also something in the erlang documentation itself. How you configure clusters depends quite a bit on how you manage servers and how dynamic/static your clusters are/should be.
   Mnesia: If you use mnesia the above afaik becomes more tricky as mnesia is said to be not well suited for nodes joining/leaving often.
   Other external dependencies to run: Look for “How to deploy external dependency”

I hope the above makes the point clear that when it comes to deployment a good chunk is not really about ruby or elixir or go, but about “do we buy a few bare metal servers and configure everything statically” or “we manage k8s clusters of 1000 nodes”; “Do we use CI/CD or deploy from developer machines?”. I’m not aware of books specifically for elixir (yet), but you should be able to read e.g. a generic “this is how you do CI/CD” book and adapt it to how elixir fit’s into the picture.

Also if you could specify which of the above topics you have most problems with people can also be more precise in suggesting reading material on the topic.