Use mosh to log into a running docker-machine instance

docker_mosh.sh

#!/usr/bin/env bash

# This script provisions an EC2 instance via docker-machine and takes the
# following positional arguments
# 1. docker-machine name (bioinfo-sandmann)
# 2. login username (ubuntu)

set -e  # exit upon error
set -o nounset  # no unset variables

# global variables
declare -r ACTIVE_MACHINE="${1:-bioinfo-sandmann}"
declare -r INSTANCE_USERNAME="${2:-ubuntu}"
declare ACTIVE_IP="$(docker-machine ip ${ACTIVE_MACHINE})"

# check if mosh is already install on the server or install it
docker-machine ssh "${ACTIVE_MACHINE}" -- which mosh &>/dev/null || \
docker-machine ssh "${ACTIVE_MACHINE}" -- apt-get install -y mosh

# connect to the instance using mosh
mosh --ssh \
    "ssh -i ~/.docker/machine/machines/"${ACTIVE_MACHINE}"/id_rsa" "${INSTANCE_USERNAME}@${ACTIVE_IP}"