How to specify the elixir version of the instance to SSH into?

1

so right after I SSH into the deployed instance, I got below error

ssh xxxx-abc@ssh.oregon.render.com
iex -S mix

returned

** (Mix) You're trying to run :my_app on Elixir v1.9.4 but it has declared in its mix.exs file it supports only Elixir ~> 1.12

Render’s default elixir is 1.9 and my deployed app is running on 1.12 by specifying ELIXIR_VERSION=1.12.1 in my environment variable.
But how can I spin up the ssh instance with the correct elixir version?

2

Just to clarify: You have a Render service that is successfully running with Elixir 1.12, but when you SSH into the instance it’s defaulting to Elixir 1.9?

3

Yes correct! The deployed app is successfully running elixir 1.12 but when I SSH into the instance I couldn’t bring up the console due to above error

4

I can confirm the same behavior. I have ELIXIR_VERSION env var set to 1.13.3. You can check it on service srv-c2d4kb3onmlahlpdbb60

When using the Shell tab in the web UI:

which iex
# /opt/render/project/elixirs/1.13.3/bin/iex

echo $PATH
# /opt/render/project/elixirs/1.13.3/bin:/opt/render/project/erlangs/24.2.1/bin:/usr/local/cargo/bin:/opt/render/project/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

When using ssh:

which iex
# /usr/local/bin/iex

echo $PATH
# /usr/local/cargo/bin:/opt/render/project/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/render-ssh/session/bin
5

It looks like Render runs a command behind the scenes to detect the version when starting or connecting to your service from most contexts, but it doesn’t run when connecting via SSH. Can you try running:

ELIXIR_ENV_FILE=/home/render/elixir-env.sh; [ -f "$ELIXIR_ENV_FILE" ] && source "$ELIXIR_ENV_FILE"; after connecting?

I’ll share this with the team to see how we can support this without needing to run the command manually.

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6

That worked, thanks.

ELIXIR_ENV_FILE=/home/render/elixir-env.sh; [ -f "$ELIXIR_ENV_FILE" ] && source "$ELIXIR_ENV_FILE";
# ==> Detected Erlang 24.2.1
# ==> Detected Elixir 1.13.3

~/project/src$ which iex
# /opt/render/project/elixirs/1.13.3/bin/iex
1 Like
7

Yes this script worked - thanks! And yes it would be great if this can be done automatically rather than manually load every time.

2 Likes
8

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