So I’m trying to use Docker buildkit features such as parallelization on my local machine and it does not work, what am I missing here? I installed docker using Docker documentation
What am I trying to do? I’m trying to build this Dockerfile:
FROM alpine AS build1
RUN touch /opt/binary1
RUN sleep 10
FROM alpine AS build2
RUN touch /opt/binary2
RUN sleep 10
FROM alpine as final
COPY --from=build1 /opt/binary1 /opt/
COPY --from=build2 /opt/binary2 /opt/
And build it using this command:
time DOCKER_BUILDKIT=1 sudo docker build .
As I understood this should run in parallel, but it doesn’t.
I’ve stumbled upon this by watching this video (from minute 5):
My OS version is: 20.04.5 LTS (Focal Fossa)
docker version
Client: Docker Engine - Community
Version: 20.10.21
API version: 1.41
Go version: go1.18.7
Git commit: baeda1f
Built: Tue Oct 25 18:02:21 2022
OS/Arch: linux/amd64
Context: default
Experimental: true
Server: Docker Engine - Community
Engine:
Version: 20.10.21
API version: 1.41 (minimum version 1.12)
Go version: go1.18.7
Git commit: 3056208
Built: Tue Oct 25 18:00:04 2022
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.6.10
GitCommit: 770bd0108c32f3fb5c73ae1264f7e503fe7b2661
runc:
Version: 1.1.4
GitCommit: v1.1.4-0-g5fd4c4d
docker-init:
Version: 0.19.0
GitCommit: de40ad0
I’ve tried this on multiple Ubuntu versions (using cloud provider) and the result is the same, what am I missing?
TL;DR
Buildkit enabled - Dockerfile not building in parallel