date prints the current date and time, like this: The command that watch will run in this case is date > /var/log/date.log. watch will repeatedly run the command you give it, every two seconds by default. This is the command we want to run in the container. Next we have alpine, which specifies the image we want to use for the container.Īnd finally we have watch 'date > /var/log/date.log'. You could choose any name you like here, or leave this off entirely to have Docker automatically generate a unique name for the new container. name container-name will name the container container-name. We use the -d flag to detach the container from our terminal and run it in the background. This is a popular Linux container image that uses Alpine Linux, a lightweight, minimal Linux distribution. This command creates a new Docker container from the official alpine image.

docker run -d -name container-name alpine watch 'date > /var/log/date.log'.

If you don’t already have a container, start a test container with the following docker run command: To use the docker exec command, you will need a running Docker container. If you need to run docker as the root user, please remember to prepend sudo to the commands in this tutorial.įor more information on using Docker without sudo access, please see the Executing the Docker Command Without Sudo section of our How To Install Docker tutorial. This tutorial assumes you already have Docker installed, and your user has permission to run docker. In this tutorial we will learn about the docker exec command and how to use it to run commands and get an interactive shell in a running Docker container. To this end, Docker provides the docker exec command to run programs in containers that are already running. When developing or deploying containers you’ll often need to look inside a running container to inspect its current state or debug a problem.

Execute command inside already running container.Docker is a containerization tool that helps developers create and manage portable, consistent Linux containers.

Create, Start, and run a command inside the container and remove the container after executing command.Start a container and creates an interactive bash shell in the container.Create a container (without starting it):ĭocker rename.Another Docker client is Docker Compose, that lets you work with applications consisting of a set of containers. The Docker client and daemon communicate using a REST API, over UNIX sockets or a network interface. The Docker client and daemon can run on the same system, or you can connect a Docker client to a remote Docker daemon. The Docker client talks to the Docker daemon, which does the heavy lifting of building, running, and distributing your Docker containers. Docker uses a client-server architecture.

Docker network command