How docker manage volumes when scaling up compose project? - docker

Question

What if have 10 instance of any container which needs presistant storage, so on 10 instance how docker will manage volume for them, i've defined volume in docker-compose.yml
i didn't find anything regarding this that what will happen when multiple instance will run?
1. will docker create new folders for each instance or
2. share same folder to all of them (this will lead data corrption)?
here is my sample docker-compose.yml
version: '2'
services:
consul:
#image: myappteam/consul:3.4.0
build: ./consul
container_name: consul
hostname: consul
domainname: consul
restart: always
volumes:
- myapp-data:/data/consul
consului:
#image: myappteam/consul-ui:3.4.0
build: ./consul-ui
container_name: consul-ui
hostname: consul-ui
domainname: consul-ui
ports:
- 8500:8500
restart: always
volumes:
- myapp-data:/data/consului
nginx:
#image: myappteam/nginx:3.4.0
build: ./nginx
container_name: nginx
hostname: nginx
domainname: nginx
ports:
- "80:80"
volumes:
- myapp-logs:/logs/nginx_access_logs
- myapp-logs:/logs/nginx_error_logs
restart: always
volumes:
myapp-data:
myapp-logs:
myapp-bundle:
myapp-source:
so in above example, myapp-data is plan i want to have all data so i was thinking when i'll increase instance of nginx, consul, will they use same myapp-data volume or create new volume? because if it will use same instance then data will corrupted because two instance will write same files..
so in that case what should i do?