CosmosDB Emulator Linux Image - Mount Volume

Question

What is the correct path for mapping a directory into the cosmosDB emulator linux docker image so that data (databases) are persisted on the host file system?

 cosmosdb:
        container_name: cosmosdb
        image: mcr.microsoft.com/cosmosdb/linux/azure-cosmos-emulator:latest
        mem_reservation: 3G
        cpu_count: 2
        tty: true
        ports:
            - "8081:8081"
            - "8900:8900"
            - "8901:8901"
            - "8979:8979"
            - "10250:10250"
            - "10251:10251"
            - "10252:10252"
            - "10253:10253"
            - "10254:10254"
            - "10255:10255"
            - "10256:10256"
            - "10350:10350"
        environment:
            AZURE_COSMOS_EMULATOR_PARTITION_COUNT: 3
            AZURE_COSMOS_EMULATOR_ENABLE_DATA_PERSISTENCE: true
            AZURE_COSMOS_EMULATOR_IP_ADDRESS_OVERRIDE: 127.0.0.1
        volumes:
           - ???

For Windows it seems to be

C:/CosmosDB.Emulator/bind-mount

I already have taken a look into the running image but i have no clue in which directoy database/data files are stored...

As so often the docu is rather short https://learn.microsoft.com/en-us/azure/cosmos-db/linux-emulator?tabs=sql-api%2Cssl-netstd21

and it just says

If the Cosmos DB emulator data folder is "volume mounted", ensure that the volume has enough space and is read/write.

But what is the data folder? ;)

Answer 1

/tmp/cosmos/appdata

found it by running docker in interactive and the the "find / cosmos" command... i didnt get any found results but it output a list of all the directories it scanned... and i found that path. just tested and it works.

this is my docker-compose

version: '3.7'

networks:
  default:
    external: false
    ipam:
      driver: default
      config:
        - subnet: "172.16.238.0/24"

services:
  cosmosdb:
    container_name: "azurecosmosdbemulatorcontainer"
    hostname: "azurecosmosdbemulatorhostname"
    image:  mcr.microsoft.com/cosmosdb/linux/azure-cosmos-emulator
    platform: linux
    stdin_open: true
    tty: true
    mem_limit: 3GB
    ports:
      - '8081:8081'
      - '8900:8900'
      - '8901:8901'
      - '8902:8902'
      - '10250:10250'
      - '10251:10251'
      - '10252:10252'
      - '10253:10253'
      - '10254:10254'
      - '10255:10255'
      - '10256:10256'
      - '10350:10350'
    environment:
      AZURE_COSMOS_EMULATOR_PARTITION_COUNT: 2
      AZURE_COSMOS_EMULATOR_ENABLE_DATA_PERSISTENCE: true
      AZURE_COSMOS_EMULATOR_IP_ADDRESS_OVERRIDE: ${External_IP}
    networks:
      default:
        ipv4_address: 172.16.238.246
    volumes:
      - cosmosdrive:/tmp/cosmos/appdata

volumes:
  cosmosdrive:
  recipientdrive: