What is an external network in Docker?
An external network in Docker is a network that is created outside the scope of a specific Docker Compose file or Docker application, allowing multiple containers across different applications to communicate seamlessly.
How do I build a Docker image?
Building a Docker image involves creating a Dockerfile, defining the environment, and using the `docker build` command. This process packages your application and its dependencies for deployment.
How do I create a Docker container?
Creating a Docker container involves defining an application’s environment in a Dockerfile, building the image with `docker build`, and running it using `docker run`.
How do I run a command in a running Docker container?
To run a command in a running Docker container, use the `docker exec` command followed by the container ID or name and the command you want to execute. For example: `docker exec -it container_name bash`.
How do I write a Dockerfile?
Writing a Dockerfile involves defining the base image, adding application files, setting environment variables, and specifying commands to run your application. Start with `FROM` to select the base image.
How do I stop and remove a Docker container?
To stop and remove a Docker container, use the commands `docker stop ` to halt it, followed by `docker rm ` to delete it. Ensure the container is not running before removal.
How do I automatically restart a Docker container?
To automatically restart a Docker container, use the `–restart` flag when creating the container. Options include `always`, `unless-stopped`, and `on-failure` to suit your needs.
How do I connect Docker to a database?
To connect Docker to a database, ensure the database is running in a container or accessible externally. Use environment variables in your Docker configuration to specify connection details.
How do I link Docker containers?
Linking Docker containers allows them to communicate seamlessly. Use the `–link` flag when starting containers, or leverage Docker Compose for network configuration.
How do I manage the lifecycle of a Docker container?
Managing the lifecycle of a Docker container involves creating, starting, stopping, and removing containers. Utilize commands like `docker run`, `docker stop`, and `docker rm` for effective control.