I have a .env file with a large list of variables in the root of my node project. In the root is also my docker-compose.yml file:
version: '3'
services:
api:
build: .
env_file:
- .env
ports:
- 5000:5000
I'm trying to pass in these variables to Docker (from here), but when I run docker-compose up, I'm running into an error in my node app because it doesn't have access to these variables. What am I doing wrong? Thanks.
Change the file name to something different like node.env. The .env file is used by the docker-compose itself to define the content of the docker-compose file itself.
Example:
$ cat .env
TAG=v1.5
$ cat docker-compose.yml
version: '3'
services:
web:
image: "webapp:${TAG}"
The content of this file is not used inside the docker instance itself.
Related
docker-compose.yml:
version: '3.7'
services:
db:
image: mysql:8.0
docker-compose.test.yml:
version: '3.7'
services:
db:
ports:
- 3306:3306
docker-compose config does not show the port. Why?
I'm trying to display the effective compose file, means: the merge result that is also used by docker-compose up.
docker-compose version 1.25.0
According to the documentation, docker-compose will only automatically find files named docker-compose.yml and docker-compose.override.yml:
By default, Compose reads two files, a docker-compose.yml and an optional docker-compose.override.yml file. By convention, the docker-compose.yml contains your base configuration. The override file, as its name implies, can contain configuration overrides for existing services or entirely new services.
If you want to use additional compose files, you need to specify them explicitly using -f <filename>:
docker-compose up -f docker-compose.yml -f docker-compose.test.yml
By default, docker-compose finds the docker-compose.yml file. The problem you are facing is happening because the port is configured in the other file and DockerCompose doesn't know anything about it. If you want to check the configuration of the other file, you need to pass it as a parameter:
docker-compose -f ./path/to/docker-compose.test.yml config
Or you can put the port configuration on the first file like this:
version: '3.7'
services:
db:
image: mysql:8.0
ports:
- 3306:3306
And it should work just fine.
I have a .env file I'm trying to use in a Docker Compose file to pass to the container to be used in the entrypoint script defined in the Dockerfile.
I have the following effective Dockerfile (spread out over two files, one override). The .env.dev file is in the same directory as the docker compose files. The environment variable value is not getting passed to the container. When I add "=${RUN_MIGRATIONS_ON_START}", the variable value is blank. If I leave that off, then the variables aren't even set in the container.
Docker compose files:
Main docker compose file:
version: '3.4'
services:
web:
build
context: .
Override docker compose file:
version: '3.4'
services:
web:
environment:
- RUN_MIGRATIONS_ON_START=${RUN_MIGRATIONS_ON_START}
- WS_SCHEME=${WS_SCHEME}
env_file:
- .env.dev
Solution
docker-compose.override.yml
version: '3.4'
services:
web:
env_file:
- .env.dev
.env.dev
RUN_MIGRATIONS_ON_START=FOO
WS_SCHEME=BAR
Why
environment:
- X=${Y} # Y is a variable from the local shell environment, not from .env
Described in detail in documentation
Your configuration options can contain environment variables. Compose
uses the variable values from the shell environment in which
docker-compose is run.
I have a .env file like this:
PROJECT_DIR=./test_dir
SUB_DIR=$(PROJECT_DIR)/sub_dir
And docker-compose.yml file like this:
version: '3.5'
services:
service_nginx:
image: nginx
volumes:
- ${SUB_DIR}:/var/www/html
But I can't use $SUB_DIR in docker-compose.yml file for volume, I got error like this:
ERROR: Named volume "$(PROJECT_DIR)/sub_dir:/var/www/html:rw" is used in service "service_nginx" but no declaration was found in the volumes section.
Update your env file as follows
export PROJECT_DIR=./test_dir
export SUB_DIR=$(PROJECT_DIR)/sub_dir
Then run the following command to read the varialbes;
. ./.env
Then deploy the stack from same terminal session.
I have docker-compose.yml like below:
version: '2'
services:
micro-service:
image: some/micro-service:${SERVICE_VERSION}
env_file:
- ../all-variables/${PROFILE}/micro_service.env
ports:
- "8085:8085"
And I have two files : dev.env and stage.env where SERVICE_VERSION and PROFILE are described.
Is there any way to specify concrete file when running docker-compose up
By default docker-compose takes .env file from current dir.
Is there a way to override it or another workaround ?
As mentioned in the answer in the comments there is no way to do that as it is directly coded into the source code to use .env.
However, there a couple ways to get similar behaviour.
The first way works natively with docker-compose, which would be to use docker-compose override files.
So in your case you could have your base docker-compose.yml file like this:
version: '2'
services:
micro-service:
image: some/micro-service:1.0.0
ports:
- "8085:8085"
Then you can define a docker-compose-dev.yml file:
version: '2'
services:
micro-service:
image: some/micro-service:dev
env_file:
- ../all-variables/dev/micro_service.env
Then you can run the following command
$ docker-compose up -f docker-compose.yml -f docker-compose-dev.yml up
If you do this the values in docker-compose-dev.yml will override those in docker-compose.yml. So instead of using image some/micro-service:1.0.0 it will use the image defined in docker-compose-dev.yml.
The second way would be to use docker-app. Which is a new experimental utility from the Docker team.
Basically you will create a dockerapp file that would look like this:
version: 0.0.1
name: app
---
version: '2'
services:
micro-service:
image: some/micro-service:${SERVICE_VERSION}
env_file:
- ../all-variables/${PROFILE}/micro_service.env
ports:
- "8085:8085"
---
SERVICE_VERSION: latest
PROFILE: default
Then if you convert your .env files to .yml render the compose file with the correct variables using docker-app.
docker-app render -f dev.yml | docker-compose -f - up
Hopefully this is helpful, I am going through a similar issue when working with multiple environments with docker-compose.
I simply want to use a environment variable loaded from file in my docker-compose file. But after running the container, I only got
WARNING: The TESTVAR variable is not set. Defaulting to a blank string.
Only found this topic, but I'm using a later version of docker like there (docker-compose: 1.14.0, docker: 17.05.0-ce). And I changed the encoding to ISO 8859-1, since I found a github issue where strange behavior with encodings was detected. Both doesn't work.
My docker-compose file
version: '2'
services:
mysql:
container_name: test_${TESTVAR}
build: mysql
mem_limit: 1G
env_file:
- credentials.env
credentials.env contains only TESTVAR=test123. To start, I run docker-compose up mysql and I also tried to specify the environment variables directly in the compose file like this:
environment:
- TESTVAR=1234
Not working, too.
If you want to use variables in the docker-compose.yml you can do it with .env file, docker docs
$ cat .env
TAG=v1.5
TESTVAR=123
$ cat docker-compose.yml
version: '3'
services:
web:
image: "webapp:${TAG}"
environment: ["TESTVAR=${TESTVAR}"]