Connection refused errors on Mac M2 with Rancher Desktop

[nuno-barreiro]

I'm using Rancher Desktop on an Apple MacBook M2 and getting the following error:

16:28:52.922 [info] Docker host: {"http+unix://%2FUsers%2Fnbarreiro%2F.rd%2Fdocker.sock/v1.41", "unix:///Users/nbarreiro/.rd/docker.sock"}

16:28:54.904 [debug] Not running in docker environment, using localhost

16:28:55.152 [info] Connection refused. Retrying... Attempt 1/3

16:29:00.155 [info] Connection refused. Retrying... Attempt 2/3

16:29:05.157 [info] Connection refused. Retrying... Attempt 3/3

16:29:10.158 [info] Ryuk host refused to connect
** (EXIT from #PID<0.94.0>) {:error, :econnrefused}

You can check the code in this sample Repo: https://github.com/nuno-barreiro/ex_test_containers_demo/tree/master

It's a standard mix new project created with Elixir 1.18, where I added the Testcontainers.start_link() on the test/test_helper.exs file and the dependencies on mix.exs. Nothing more.

Some more info on the laptop specs:

• Chipset: Apple M2
• MacOS: Sequoia 15.3.1
• Rancher Desktop: 1.18.2
• Docker version 28.0.4, build b8034c0ed7
• rdctl client version: 1.1.0, targeting server version: v1

[jarlah]

Have you tried the mix testcontainers.test task ? Same error ?

[nuno-barreiro]

Hey @jarlah... yes. Running with mix test or mix testcontainers.test does not make any difference unfortunately.

[jarlah]

sorry late reply.

export TESTCONTAINERS_DOCKER_SOCKET_OVERRIDE=/var/run/docker.sock
export TESTCONTAINERS_HOST_OVERRIDE=$($HOME/.rd/bin/rdctl shell ip a show vznat | awk '/inet / {sub("/.*",""); print $2}')

these two lines wont help with anything related to testcontainers-elixir. These env vars arent used.

Sadly it wont run out of the box with Rancher Desktop on Debian 12 too

$ source .env 
ip: can't find device 'vznat'
Error: exit status 1

I think maybe you believe that env vars used in other testcontainers libraries will work in all libraries. This is sadly not the case.

I will look more into it, but initially i see problems with using rancher desktop.

[jarlah]

it looks interesting though, ill look more into rancher desktop :)

[jarlah]

I did indeed not look more into rancher desktop and my sporadic macbook usage is almost non existent atm. Mostly using Linux. I suppose you stopped using the library, so if someone else finds this problem, I'm here to help debugging the problem further