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(Golang / Modern Devops) Paris
4
Better Docker images for Go
27/02/2018
Meetup
(Golang / Modern Devops) Paris
Julien CROUZET
eTF1
Basics
Standard images
• Use standard "FROM golang" and build
BASICS
• Optimize Dockerfile for caching
• Use Golang:onbuild
Standard
Binary built in image
Big image size
Lot of unnecessary files
Lighter
Optimize image building
to make it lighter
• .dockerignore or specify files
MAKE IT LIGHTER
• Use alpine-based Golang image
• Binary-only image without go
Lighter images
No unnecessary files
Go as prerequisite on CI system
Smarter
Keep lighter images,
with a smarter build
• Docker multistage (>=17.05)
MAKE IT SMARTER
• Generate multiple versions (run & debug)
• Complex case with prebuilt image
Lighter images
No unnecessary files
Build outside container
Non-go binary