docker-forward

docker-forward.sh

#!/usr/bin/env zsh
# Poor soul's `docker-machine env` equivalent using ssh forwarding.
# Assumes that the remote docker is listening on tcp://127.0.0.1:2375.

LOCAL_DOCKER_PORT=${LOCAL_DOCKER_PORT:-22375}

pidfile="/var/run/user/$(id -u)/docker-forward-session.pid"
existing_session=$(cat $pidfile 2>/dev/null)

if [[ $1 == stop ]]; then
    kill -TERM $existing_session
    rm $pidfile &>/dev/null
    cat <<EOF
export DOCKER_HOST=
# (You should eval this command)
EOF
    exit 0
fi

if [[ ! "$existing_session" -gt 0 ]]; then
    ssh -NTL ${LOCAL_DOCKER_PORT}:localhost:2375 $1 &>/dev/null & disown
    echo $! > $pidfile
fi

cat <<EOF
export DOCKER_HOST=tcp://localhost:$LOCAL_DOCKER_PORT
# (You should eval this command)
EOF

Updated it to leave existing sessions alone so you can eval it in multiple shells.