How do I run a command on an already existing Docker container?
To run a command on an already existing Docker container, you can use the docker exec
command. The docker exec
command allows you to run a command in a running container.
The basic syntax of the docker exec
command is:
docker exec [OPTIONS] CONTAINER COMMAND [ARG...]
OPTIONS
: Optional flags for thedocker exec
command.CONTAINER
: The name or ID of the container you want to run the command in.COMMAND
: The command you want to run in the container.ARG
: Additional arguments to pass to the command.
For example, to run a command in a container with the name my-container
, you can use the following command:
docker exec -it my-container command
In this example, the -it
flag is used to allocate a new pseudo-TTY for the command. The command
argument is the command you want to run in the container.
If you want to run a command as the root user, you can add the -u root
flag to the docker exec
command:
docker exec -it -u root my-container command
This will run the command
as the root user in the my-container
container.
-
How to Force Docker to Clean Build an Image?
When executing docker pull or docker run command, the daemon first checks for a similar image in the local machine by comparing the digests of the image. If it finds a match, the daemon simply crea...
Questions -
How to update PATH environment variable in a Dockerfile?
To update the PATH environment variable in a Dockerfile, you can use the ENV instruction to set the new value of the PATH variable. Here's an example: FROM ubuntu Set a new value for the PATH envir...
Questions -
How to push a docker image to a private repository?
To push a Docker image to a private repository, you can follow these steps: Log in to the private repository using the following command: docker login <repository_url> Replace <repository_url> with...
Questions -
How to Mount a Host Directory in a Docker Container?
If you want to mound a host directory in a Docker container, you have to main ways to do that: Using the ADD command: The simplest way is to use the dockers ADD command as shown below: ADD . /path/...
Questions
We are hiring.
Software is our way of making the world a tiny bit better. We build tools for the makers of tomorrow.
Help us in making the internet more reliable.

Help us with developer education and get paid.
