kaniko docker build: can't find command - docker

Question

Newbie to kaniko, and try to build docker images in ubuntu docker host.
I have a local Dockerfile and main.go app
# Dockefile
FROM golang:1.10.3-alpine AS build
ADD . /src
RUN cd /src && go build -o app
FROM alpine
WORKDIR /app
COPY --from=build /src/app /app/
CMD [ "./app" ]
#main.go
package main
import "fmt"
func main() {
fmt.Println("Hello, World!")
}
And in command line, i run
docker run -it -v $(pwd):/usr \
gcr.io/kaniko-project/executor:latest \
--dockerfile=Dockerfile --context=/usr --no-push
Unfortunately, I got error like below
...
INFO[0006] Skipping paths under /proc, as it is a whitelisted directory
INFO[0006] Using files from context: [/usr]
INFO[0006] ADD . /src
INFO[0006] Taking snapshot of files...
INFO[0006] RUN cd /src && go build -o app
INFO[0006] cmd: /bin/sh
INFO[0006] args: [-c cd /src && go build -o app]
/bin/sh: go: not found
error building image: error building stage: waiting for process to exit: exit status 127
What's wrong? (docker version 18.09.0)

Answer 1

You need to use different path for context in kaniko. Your command to run this build should look like this:
docker run -it -v $(pwd):/context \
gcr.io/kaniko-project/executor:latest \
--dockerfile=Dockerfile --context=/context --no-push
In your command with /usr as context kaniko where overriding this path in all of Dockerfiles and in golang image, go is located in /usr path thats why it couldn't find it then
# which go
/usr/local/go/bin/go