README.md

Docker Container Size Quirks

Dockerfile.echo

# minimal base image
from alpine:3.16.2

# run a no-op command
RUN echo "testing"

Dockerfile.nuance

# minimal base image
from alpine:3.16.2

# create a directory in the filesystem
RUN mkdir /testing

# create a 5mb file
RUN head -c 5000000 /dev/urandom > /testing/5mb.testing.file

# assign read perms to file
RUN chmod +r /testing/*

Dockerfile.perms

# minimal base image
from alpine:3.16.2

# create a directory in the filesystem
RUN mkdir /testing

# create 5mb files
RUN head -c 5000000 /dev/urandom > /testing/5mb.testing.1.file
RUN head -c 5000000 /dev/urandom > /testing/5mb.testing.2.file

# assign read perms to file
RUN chmod +r /testing/*

Dockerfile.perms.v2

# minimal base image
from alpine:3.16.2

# create a directory in the filesystem
RUN mkdir /testing

# create 5mb files
RUN head -c 5000000 /dev/urandom > /testing/5mb.testing.1.file
RUN head -c 5000000 /dev/urandom > /testing/5mb.testing.2.file

# assign read perms to file
RUN chmod +r /testing/*  # chmod it once
RUN chmod +r /testing/*  # chmod it again

Dockerfile.perms.verbose

# minimal base image
from alpine:3.16.2

# create a directory in the filesystem
RUN mkdir /testing

# create 5mb files
RUN head -c 5000000 /dev/urandom > /testing/5mb.testing.1.file

# assign read perms to file
RUN stat /testing/*
RUN chmod +r /testing/*  # chmod it once
RUN stat /testing/*
RUN chmod +r /testing/*  # chmod it again
RUN stat /testing/*

Dockerfile.yq

FROM alpine:3.16.2

ENV YQ_VERSION "v4.22.1"
RUN wget https://github.com/mikefarah/yq/releases/download/${YQ_VERSION}/yq_linux_amd64
RUN mv yq_linux_amd64 /usr/local/bin/yq
RUN chmod +x /usr/local/bin/*

Dockerfile.yq.slim

FROM alpine:3.16.2

ENV YQ_VERSION "v4.22.1"
RUN wget https://github.com/mikefarah/yq/releases/download/${YQ_VERSION}/yq_linux_amd64 \
  && mv yq_linux_amd64 /usr/local/bin/yq \
  && chmod +x /usr/local/bin/yq

Makefile

ECHO_TAG=sizing-echo
NUANCE_TAG=sizing-nuance
PERMS_TAG=sizing-perms
PERMS_V2_TAG=sizing-perms-v2
YQ_TAG=sizing-yq
YQ_SLIM_TAG=sizing-yq-slim

dive-echo:
	dive build -f Dockerfile.echo -t $(ECHO_TAG) .

dive-nuance:
	dive build -f Dockerfile.nuance -t $(NUANCE_TAG) .

dive-perms:
	dive build -f Dockerfile.perms -t $(PERMS_TAG) .

dive-perms-v2:
	dive build -f Dockerfile.perms.v2 -t $(PERMS_V2_TAG) .

build-perms-verbose:
	BUILDKIT_PROGRESS=plain docker build --no-cache -f Dockerfile.perms.verbose .

dive-yq:
	dive build -f Dockerfile.yq -t $(YQ_TAG) .

dive-yq-slim:
	dive build -f Dockerfile.yq.slim -t $(YQ_SLIM_TAG) .

build:
	marp slides.md --pdf --allow-local-files
	marp slides.md --html

dive.demo.gif

docker.yq.gif

docker.yq.slim.gif

slides.html

slides.md

slides.pdf