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 the
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
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