Linux command
docker-exec 命令
文本
复制后可按需替换文件名、目录或参数。
常用示例
Run command in container
docker exec [container] [command]
Open interactive shell
docker exec -it [container] /bin/bash
Run as specific user
docker exec -u [root] [container] [command]
Set environment variable
docker exec -e [VAR=value] [container] [command]
Run in specific directory
docker exec -w [/path] [container] [command]
说明
docker exec runs a new command in a running container's existing environment, creating a new process within the container's namespaces and cgroups. This is fundamentally different from docker run, which creates an entirely new container. The most common use case is opening an interactive shell for debugging with docker exec -it container /bin/bash, which provides direct access to the container's filesystem and running processes. Commands executed via docker exec inherit the container's environment but can be customized with user, working directory, and environment variable options. The --privileged flag grants extended capabilities useful for system administration tasks, though it should be used cautiously as it reduces container isolation.
参数
- -d, --detach
- Run command in background.
- -i, --interactive
- Keep STDIN open.
- -t, --tty
- Allocate pseudo-TTY.
- -u, --user _user_
- Username or UID.
- -w, --workdir _dir_
- Working directory inside container.
- -e, --env _list_
- Set environment variables.
- --env-file _file_
- Read environment variables from a file.
- --detach-keys _sequence_
- Override the key sequence for detaching from the container.
- --privileged
- Give extended privileges.
FAQ
What is the docker-exec command used for?
docker exec runs a new command in a running container's existing environment, creating a new process within the container's namespaces and cgroups. This is fundamentally different from docker run, which creates an entirely new container. The most common use case is opening an interactive shell for debugging with docker exec -it container /bin/bash, which provides direct access to the container's filesystem and running processes. Commands executed via docker exec inherit the container's environment but can be customized with user, working directory, and environment variable options. The --privileged flag grants extended capabilities useful for system administration tasks, though it should be used cautiously as it reduces container isolation.
How do I run a basic docker-exec example?
Run `docker exec [container] [command]` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does -d, --detach do in docker-exec?
Run command in background.