Docker：在容器中运行的 spigot 控制台上执行命令

Question

To summarize the problem I have: I want to execute a command on the minecraft console that is running in the container like when I attach to it in interactive mode but without the need to attach to it.

docker attach container_name

command

detach_from_contaienr

Like running docker exec but it puts the command into the stdin of the programm that is running inside the container like in docker attach.

I simply search a oneliner that does the same. Like in this question

Edit: echo 'say test' | docker attach <container id> echo 'say test' | docker attach <container id>

Gives the Error:

the input device is not a TTY

Edit2: after removing the -t flag on the container linke in this post

echo 'say test' | docker attach <container id>

the command gets to the server as the log reveales but after executing that I am stuck in a blank input because the command doesn't stop somehow

If i now do the double ctrl+c the container stops...

Edit3: I try to execute these commands on the docker host and execute the command in the running spigot minecraft server

Answer 1

Apparently, you can use a named pipe to do this, as shown here: https://stackoverflow.com/a/26765590/2926055

# in the Docker container
$ mkfifo myfifo
$ java -jar minecraft_server.jar nogui < myfifo

# via your `docker exec`
$ echo 'say test' > myfifo

As noted, be careful you don't accidentally send an EOF character.