cd /etc/default/docker (if not existing, create the file)
Add the following line (or the --ip=... part if already existing):
DOCKER_OPTS="--ip=192.168.123.123" (Your docker host IP)
Restart docker: systemctl stop docker systemctl start docker
Don't forget to ensure that the docker host always receives the same IP.
See: https://docs.docker.com/engine/reference/commandline/dockerd/#options