What does docker exec mean?

In docker, exec is a command, which means to execute a command in a running container; using this command can execute the command in the container in the same way as on the host. When the parameter is set to When "-d" is used, it means running in the background, and the syntax is "docker exec [OPTIONS] CONTAINER COMMAND [ARG...]".

The operating environment of this tutorial: linux7.3 system, docker version 19.03, Dell G3 computer.

What does docker exec mean

docker exec: Execute commands in a running container

Syntax

docker exec [OPTIONS] CONTAINER COMMAND [ARG...]

OPTIONS Description:

-d: Detached mode: Run in the background

-i: Keep STDIN open even if not attached

-t: Allocate a pseudo terminal

What exec actually wants to express It executes commands in a running container. By using the exec command, commands can be executed in the container the same as on the host.

The example is as follows:

Execute the /root/runoob.sh script in the container in interactive mode in the container mynginx:

runoob@runoob:~$ docker exec -it mynginx /bin/sh /root/runoob.sh
http://www.runoob.com/

In the container mynginx Open an interactive mode terminal:

runoob@runoob:~$ docker exec -i -t  mynginx /bin/bash
root@b1a0703e41e7:/#

You can also use the docker ps -a command to view the running containers, and then use the container ID to enter the container.

# docker ps -a 
...
9df70f9a0714        openjdk             "/usercode/script.sh…" 
...

9df70f9a0714 in the first column is the container ID.

Execute bash on the specified container through the exec command:

# docker exec -it 9df70f9a0714 /bin/bash

What exec actually means is to execute the command in a running container. (Go into the container and take a look)

docker exec -it container/bin/bash This command line actually executes /bin/bash in -it mode

Recommended learning: "docker video tutorial"

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