Dockerコンテナを指定して ssh 接続するスクリプト（SSH鍵の転送には ssh-copy-id が必要）

docker2ssh

#!/bin/bash

die() {
	echo "$1" 1>&2
	exit 1
}

usage() {
	die "Usage: $(basename $0) [-s] [-u USER] CONTAINER"
}

USER=root

while getopts "su:h" opts; do
	case $opts in
	s) shift; setup=yes;;
	u) shift; USER=$OPTARG; shift;;
	h) shift; usage;;
	esac
done


[ -z "$DOCKER_SSH_PORT" ] && DOCKER_SSH_PORT=2022
[ -n "$DOCKER_SSH_KEY" ] && SSH_OPTS="-i $DOCKER_SSH_KEY"

if [[ -n "$DOCKER_HOST" && ! "$DOCKER_HOST" =~ ^unix: ]]; then
	docker_host=${DOCKER_HOST#tcp://}
	docker_host=${docker_host%:*}
	[ -z "$docker_host" ] && docker_host=localhost
	PROXY_HOST="$SSH_OPTS -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -p $DOCKER_SSH_PORT docker@$docker_host"
fi


container=$1; shift

if [[ "$setup" == yes && -z "$container" && -n "$PROXY_HOST" ]]; then
	echo "SSH key copy to Docker VM..."
	ssh-copy-id $PROXY_HOST
	exit
fi


[ -z "$container" ] && usage

docker_port=`docker port $container 22`
host=${docker_port%:*}
port=${docker_port#*:}

if [ -z "$host" ]; then
	host=`docker inspect -format="{{ .NetworkSettings.IPAddress }}" $container`
	port=22
fi

[[ -z "$host" || -z "$port" ]] && usage


TARGET_HOST="$SSH_OPTS -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -p $port $USER@$host $@"


if [ "$setup" == yes ]; then
	echo "SSH key copy to Docker container..."

	if [ -n "$PROXY_HOST" ]; then
		ssh-copy-id -o ProxyCommand="ssh -W %h:%p $PROXY_HOST" $TARGET_HOST
	else
		ssh-copy-id $TARGET_HOST
	fi

	exit
fi


if [ -n "$PROXY_HOST" ]; then
	ssh -o ProxyCommand="ssh -W %h:%p $PROXY_HOST" $TARGET_HOST
else
	ssh $TARGET_HOST
fi

docker run で -p 22 を指定しなくても起動できるようにしたよ