Define an anchor using the & character and reference it everywhere using the
<<: * alias:
version: '2.4'
x-default-logging: &logging
logging:
options:
max-size: '12m'
max-file: '5'
driver: json-file
services:
web:
image: alpine:latest
command: /bin/true
<<: *logging
postgres:
image: postgres:alpine
<<: *logging
redis:
image: redis:alpine
<<: *logging
If you run docker-compose config you’ll see x-default-logging is gone and
aliases are replaced.