What is docker compose and what are its benefits
Docker Compose is a command line tool that makes it easier to run a group of docker containers. Docker Compose can simplify container deployment by automatically creating the individual services (like database and web server) that your application needs in order to function. You can deploy your application as a series of services, or as just one service. You can even scale the individual services during deployment, without needing to rebuild the whole container.
The components that compose your application are called services, and these can be defined in a very simple manner using docker-compose.yml. Since you can define multiple services, you can choose to have your application as a collection of services or as just one service.
Minerall is a website that aims at simplifying the process of choosing the right setup for your GPU mining rig. It utilizes Docker Compose to deploy an application with its dependencies in a single container, and then use it as a black box to start containers based on it. Ultimately, Minerall is a web application that you can use to start off your mining rig.
We will use this setup for the Small Stakes Mining Rig.
Small Stakes Mining Rig Docker Compose Configuration
How to use docker compose to override a command
The following example uses Docker Compose to start, pause and restart a web server that is created from the web image on Docker Hub. The Docker Compose configuration file named docker-compose.yml sets up the web container along with a test container and exposes port 80 so the web server can be accessed using a web browser.
The containers are started using the docker-compose command. The -p flag exposes port 80 from the web container to port 8080 on the test container. Therefore, you can use a web browser to access the web server on port 8080 of the host machine.
Stop and restart the containers at any time by running docker-compose stop or docker-compose restart . To remove all containers, run docker-compose down .
Configuring the Amazon ECS container agent
Examples of how to use docker compose to override a command
Docker compose is also useful for setting up test environments, such as a test database or web server. For example, you can use Docker Compose to create your environment prior to running your tests. In the following example, I am using Docker Compose to override a command.
docker-compose -f docker-compose.yml -p test run python manage.py test
The command overrides is to use “run” instead of “build”. When running the docker container with this command and python manage.py test, the results are as follows:
Tips for using docker compose to override commands
Docker Compose is configured using a yaml file. The configuration follows the same format as a docker-compose.yml file, but with extra section headers that help you override commands: [web] (this is the section header for the web container, allowing you to override all commands in this container) [web.1] command: [“sleep”, “100”] (using the override commands feature, you can change the command of a container to what you need)
Note that if you want to override a command in the docker-compose.yml file, always use the section header for that service. Otherwise, your changes may be lost when the compose file is updated.
docker-compose -f test.yml add-override
Note that you may also want to add the option –force to override a command. Otherwise, docker-compose will ignore the section header and will not execute the command. [TEST] (this is another section header use to override all commands)
NOTE: Compose file changes are permanent! Therefore, consider adding your own override commands in a separate compose file, and running docker-compose -f test.yml again to overwrite the existing override commands.