Fixing ko local image publishing on MacOs

Preamble:

I still use Docker desktop to run containers on my MacBook Air. I know there's Colima but have no time to switch and deal with the consequences.
I also recently started using ko for containerizing my Go apps.

ko is Great but...

I love ko - it builds distroless secure and slim images. But there's one issue - by default - ko build pushes the resulting image to the remote registry.
It's kinda fine for continuous delivery, but I do a lot of experiments and I don't always want to publish all the garbage I create to remote - trying to be considerate of network bandwidth and image storage.

So instead I want to build my images to the local image storage.
It's possible to do that with ko build . -L
Just that on MacOs this was failing for me with the following:

2024/07/22 15:52:50 Loading otomato/myapp:717e6196339c956bc878bd58f5ab8244a709dc0510051f9e6df72620f28a2aaa
2024/07/22 15:52:50 daemon.Write response:
Error: failed to publish images: error publishing ko://github.com/otomato/myapp: error loading image: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Calling the Docker daemon

Clearly the docker client inside ko is trying to contact Docker daemon on the standard socket and failing.

I tried googling for this error but didn't find anything. So I decided to solve it myself.
Here's the thing - on MacOS the Docker socket isn't the standard /var/run/docker.sock - instead it's at ~/Library/Containers/com.docker.docker/Data/docker.raw.sock

The Solution

In order to fix this what I needed to do is create a symlink from the actual Docker socket to where the standard Docker client expects to find it:

sudo ln -s ~/Library/Containers/com.docker.docker/Data/docker.raw.sock /var/run/docker.sock

Now that Docker daemon can be contacted via the standard socket address - ko can push images to it:

ko build . -B -L --platform linux/arm64
2024/07/22 16:04:04 Building github.com/otomato/myapp for linux/arm64
2024/07/22 16:04:04 Loading otomato/myapp:717e6196339c956bc878bd58f5ab8244a709dc0510051f9e6df72620f28a2aaa
2024/07/22 16:04:05 Loaded otomato/myapp:717e6196339c956bc878bd58f5ab8244a709dc0510051f9e6df72620f28a2aaa
2024/07/22 16:04:05 Adding tag latest
2024/07/22 16:04:05 Added tag latest
otomato/myapp:717e6196339c956bc878bd58f5ab8244a709dc0510051f9e6df72620f28a2aaa

Meanwhile I also opened an issue on the ko repo. But until it's fixed - this hack works like charm.

Hope this helps you too.

The above is the detailed content of Fixing ko local image publishing on MacOs. For more information, please follow other related articles on the PHP Chinese website!