Run Postgres in docker, but expose it locally like it's native

docker-pg.sh

# Make a VirtualBox VM with enough memory
docker-machine create --driver virtualbox --virtualbox-memory 8096 default

# Map the VirtualBox VM ports 5432 to localhost
VBoxManage controlvm default natpf1 "tcp-port5432,tcp,,5432,,5432"

# If this VM will be reused, bake port mapping into the VM
VBoxManage modifyvm default --natpf1 "tcp-port5432,tcp,,5432,,5432"

# Run a Postgres instance
# docker run -d --name "postgres-in-docker" -e POSTGRES_USER=`whoami` -p 5432:5432 postgres

# If you want postgis installed (I do)
# docker run -d --name "postgres-in-docker" -e POSTGRES_USER=`whoami` -p 5432:5432 mdillon/postgis:9.4

# Does this work?
psql -h localhost -c "select 1;"

docker-machine start default - sometimes you can just restart the VM on startup