[tidepod12]

This is a question that I see hotly debated a lot in Elixir circles. BEAM and the Elixir toolset do have a lot of tools that overlap with Docker, so there's a lot of people that advocate for "not bothering" with Docker, while there's other people that are familiar with Docker (and perhaps not as familiar with BEAM) that will tend to use Docker. They both have more or less the same capability to deliver the same functionality.

IMO, in most use cases it makes sense to just use whichever you're more familiar with and will be more productive with. After all, that is the entire point of said tools...

[lostjohnny]

BEAM tools are kubernetes done right for a single environment.

I say done right because kubernetes doesn't allow hot code reload without restarts.

[kungfooguru]

They really do not overlap at all. I don't understand why the comparison with docker and Kubernetes continues.

Running BEAM on docker in kubernetes is great, a lot is added and operations smoothed by doing so.

[tidepod12]

Elixir Releases/Distillery definitely do overlap with Docker deployment techniques. The BEAM also has scaling capabilities that are tantamount to K8s horizontal scaling.

[kungfooguru]

Deployment doesn't overlap. Erlang releases bundle up your code but you still need libraries like openssl, to have a nice bundle that can actually just run anywhere Docker is the way to go.

And horizontal scaling between the two do not overlap either, not sure what you mean. Packing containers (processes) efficiently into a cluster of nodes is not something Erlang does.

Edit: Erlang/OTP does offer fail over for what it calls "distributed applications" but based on a static set of nodes -- not horizontal scaling, anymore than other languages/frameworks do by letting you spawn new instances...

[tidepod12]

>Deployment doesn't overlap. Erlang releases bundle up your code but you still need libraries like openssl, to have a nice bundle that can actually just run anywhere Docker is the way to go.

And with Docker you still need libraries like, y'know Docker for your code to run.

>Packing containers (processes) efficiently into a cluster of nodes is not something Erlang does.

How much have you used BEAM? It definitely does do that. Scalability is one of Erlang/Elixir's primary benefits, and node clustering is exactly how it does that.

[kungfooguru]

> How much have you used BEAM?

Over a decade professionally.

The closest thing Erlang has to it is pool http://erlang.org/doc/man/pool.html

[ZephyrP]

BEAM doesn't do everything containers or a container orchestration system can, but in view of my relatively short time as a regular Erlang programmer (definitely less than 10 years), the spirit of tidepod's point accords with my experience (with a weaker interpretation of his term "node clustering"). BEAM and OTP don't do automatic load distribution between nodes, but can be fashioned to do so easily with application support.

We never used pool. The nodes were mapped onto heterogenous machines sharing the host with a 3rd-party daemon. It's configuration changes even took place through a module update hook written in Erlang itself. We both deployed new code and distributed work "manually" across them entirely on OTP.

[NOTE] It it surprising, or was to me, that there are problems with having a fairly small number of nodes fully connected. I'm lucky enough to have avoided learning this the hard way, but imagine this could serve as a painful backbone to an "Erlang deployment war story".