An environment variable is a dynamic named value, containing an editable value and it could affect the program or services running on a computer/machine. The best way is to specify environment variables outside the docker-compose.yml file. --shell string Force environment to be configured for a specified shell: [fish, cmd, powershell, tcsh, bash, zsh], default is auto-detect --ssh-add Add SSH identity key to SSH authentication agent --ssh-host Use SSH connection instead of HTTPS (port 2376) -u, --unset Unset . The DOCKER_CONTEXT environment variable is related to docker context, which allows you to set the "context" / environment in which all docker commands are run. Docker creates the services, meaning that the Docker found the values for the environment variables in the var.env file. Context environment variables (assuming the user has access to the Context). To disable usage of contexts, you can use the special default context. environment: - BUILD_VERSION Other common places to miss quoting include environment variables: docker run -e SOME_VAR=Value With Spaces image_ref which docker would interpret as trying to run the image With:latest and the command Spaces image_ref. If you need to set up many variables, use the --env . ARG values can't do the job - you can't access them . With the release of 19.03, docker now supports managing the context within the CLI. Let's start with something you can use right now, without having to read the whole thing! Context environment variables (assuming the user has access to the Context). Note: Environment variables set in this way are not available to steps run within the container, . Options--no-proxy Add machine IP to NO_PROXY environment variable -o, --output string One of 'text', 'yaml' or 'json'. Import a context from a tar or zip file. Here's an example .env file: APP_PORT=8080 DB_PORT=33060. Docker sets the values via the command line or by reading files, such as the .env file in the example. Override Environment Variables in Docker What is environment variable? The environment file is not part of the build process, it is used when running the container. The Run command is executed at build time (I.e. You need modify docker compose to read the secret env file from /run/secrets. All we need to do is write a Compose file containing the configuration for the application's services and have a running Docker engine for deployment. Set the default context to use, when DOCKER_HOST, DOCKER_CONTEXT environment variables and --host, --context global options are not set. In docker-compose you can specify build args in the file: build: context: . Run a docker context ls to verify that the "docker-test" context is now the active context. Way to pass GitLab CI Secret Variables to Docker-in-Docker context We should pass Secret Variables into a Docker-in-Docker environment via GitLab CI docker executor. For example, the following will send the command to a context called "production". This can include: Configuration settings; Encryption keys; External resource locations. Environment variables can also be set for a Docker container. Frequent Misconceptions. Next, edit open the docker-compose.yml file with your favorite editor and comment out the environment section in the docker-compose.yml from the previous section. This workaround is not officially supported. Note: Make sure put the container name after the environment variable, not before that. We can already pass Secret Variables into a Docker context, but can't pass them to a D-in-D context environment. You can also use the global --context flag to override the context specified by the DOCKER_CONTEXT environment variable. As can be seen, the Docker container correctly interprets the variable VARIABLE1. Docker allows developers to set and manage environment variables in the command line interface (CLI) or an external . Create a Docker context using: [Use arrows to move, type to filter] An existing AWS profile AWS secret and token credentials > AWS environment variables Based on the familiarity with the AWS credentials setup and the AWS tools use, we are prompted to choose between 3 context setups. The picture above shows us that we need to use the following syntax to create environment variables: VARIABLENAME=variablevalue. Dig a bit deeper with docker context inspect. Windows PowerShell: So when the Run command is executed the environment variable has not been populated yet. Add the code below to set default values for the environment variables in the Compose file. Simply run it with the -e flag, shorthand for --env, and pass in the key=value pair: sudo docker run \ -e POSTGRES_USER='postgres' \ -e POSTGRES_PASSWORD='password' \ . This configuration here passes the POSTGRES_USER variable to both the build environment and the runtime environment, and sets a default value if it does not exist. You need to use build-args. In this case, the local value of the host environment variable env_var_name will be passed through to the container. Here is how my docker-compose.yml looks like: # Docker Context. $ docker context use CONTEXT Extended description Set the default context to use, when DOCKER_HOST, DOCKER_CONTEXT environment variables and --host, --context global options are not set. To do this, use the environment key. # Options Show activity on this post. Read on and you will understand how to configure your Docker images and dockerized apps with ease - with the power of Docker build-time variables, environment variables and docker-compose templating. Running docker-compose starts the service. This means all docker commands will be executed against the "default" context unless overridden with environment variables such as DOCKER_HOST and DOCKER_CONTEXT, or on the command-line with the --context and --host flags. This overrides the context set with docker context use. docker context import. As can be seen, the Docker container correctly interprets the variable VARIABLE1. You can save the following code as entrypoint_overwrited.sh: To prevent this, and really unset the environment variable, use a RUN command with shell commands, to set, use, and unset the variable all in a single layer. To pass environment variables to a container launched this way, you will have to configure the compose file to pass the session's variables through to the Docker container. when building the image ) while the environment variable in your docker-compose is added to the container at run time. Note: Environment variables set in this way are not available to steps run within the container, . The ".env" file. So you can create a .env file like below. docker context (for example), allows you to switch between a local and a remote daemon (the context stores the configuration, such as the DOCKER_HOST to connect to, and/or the Kubernetes . $ docker run --env VARIABLE1=foobar alpine:3 env Simply put, we're reflecting the environment variables we set back to the console: VARIABLE1=foobar. Note that this context is overridden by the DOCKER_HOST variable, so to use it, you'll need to be sure that isn't set: unset DOCKER_HOST Now list the current context values: docker context ls (docker-compose.yml file:) While working on it (and to make it a bit more generic), my next step was to find a way to pass the database admin user/pass (and other configuraiton options) into the containers as environment variables which took me way longer to figure . If you want to pass a parameter at build time, I would suggest using a build argument instead. We can omit the values in the docker-compose file in that case it will pick the value present in the environment in which the docker-compose is running . Use right now, without having to read the whole thing using DOCKER_CONTEXT. As above, you can overwrite your docker-compose.yaml file as displayed below variables from it editor and out... 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