seggcsont

export VAR1="foo"
export VAR2="bar"

envsubst < docker-compose-template.yml > docker-compose.yml
docker-compose -f docker-compose.yml pull
docker-compose -f docker-compose.yml up -d

seggcsont

[vagrant@hotels_box ~]$ envsubst < docker-compose.yml 
app:
  image: python:
  command: python -v
  volumes:
    - /tmp:/workdir
[vagrant@hotels_box ~]$ python_version=alpine envsubst < docker-compose.yml 
app:
  image: python:alpine
  command: python -v

seggcsont

:) [07:39:19] bpi ~ $ docker-compose -v
docker-compose version 1.9.0, build 2585387
:) [07:40:46] bpi /tmp $ docker-compose -f docker-compose.yml up
WARNING: The python_version variable is not set. Defaulting to a blank string.
ERROR: no such image: python:: invalid reference format
:( [07:40:59] bpi /tmp $ python_version=alpine docker-compose -f docker-compose.yml up
Pulling app (python:alpine)...
alpine: Pulling from library/python
709515475419: Pull complete
7f8ede2d2484: Pull complete

seggcsont

[vagrant@hotels_box ~]$ docker-compose -v
docker-compose version: 1.3.3
CPython version: 2.7.9
OpenSSL version: OpenSSL 1.0.1e 11 Feb 2013
[vagrant@hotels_box ~]$ docker-compose -f docker-compose.yml up
Pulling app (python:${python_version})...
Pulling repository python
Traceback (most recent call last):
  File "<string>", line 3, in <module>
  File "/code/build/docker-compose/out00-PYZ.pyz/compose.cli.main", line 32, in main

seggcsont

app:
  image: python:${python_version}
  command: python -v
  volumes:
    - /tmp:/workdir

seggcsont

pacman -Sy gettext

seggcsont

yum install gettext

seggcsont

apt-get update
apt-get install gettext-base