create vm
git piston

install dock and piston units
systemctl enable dock@{1..10}.service
systemctl start dock@{1..10}.service
systemctl enable piston@{1..10}.service
systemctl start piston@{1..10}.service

install nginx config

export image:
./multidock 1 save -o piston.tar piston:latest

copy in image:
./multidock 1 load -i piston.tar
./multidock 2 load -i piston.tar
./multidock 3 load -i piston.tar
./multidock 4 load -i piston.tar
./multidock 5 load -i piston.tar
./multidock 6 load -i piston.tar
./multidock 7 load -i piston.tar
./multidock 8 load -i piston.tar
./multidock 9 load -i piston.tar
./multidock 10 load -i piston.tar