$ docker run --rm --name c1 --ipc shareable -it ubuntu:18.04 /bin/bash
# mkfifo /dev/shm/mypipe
# echo "Hello from C1" > /dev/shm/mypipe
$ docker run --rm --name c2 --ipc container:c1 -it ubuntu:18.04 /bin/bash
# cat /dev/shm/mypipe
Hello from C1