Error to build docker image with docker file...

[mcarbonneaux]

i used mcarouter/scripts/docker/ubuntu/Dockerfile to build my image.

mcrouter/mcrouter/scripts/docker/ubuntu > docker build .
Sending build context to Docker daemon  6.144kB
Error response from daemon: Dockerfile parse error line 12: Unknown flag: mount

the problem are related with this line:

RUN             --mount=type=bind,target=/tmp/scripts,source=scripts /tmp/scripts/deps.sh
RUN             --mount=type=bind,target=/tmp/scripts,source=scripts /tmp/scripts/build.sh

the docker build don't understand this syntax.

i use docker 19.03.5, y don't found information on internet about this syntax and what version support it!
what version of docker build (or any other tool) to build this dockerfile ?

[mcarbonneaux]

ok i found, is experimental syntax of the docker build.
need to be activated by environement variable before launch docker build.

> export DOCKER_BUILDKIT=1

but we need at least v18.09 of docker or use https://github.com/moby/buildkit.