## Docker Volumes
Advance section


Volumes provide the ability to connect specific filesystem paths of the container back to the host machine. If a directory or a file in the container is mounted, changes in that directory  or file can also be seen on the host machine.we are going to use a mapping of a directory present on the host macine with the container path.

{%note%}

To make changes to the `docker-compose.yaml` file you will need to download it from the release page [here](https://github.com/open-metadata/OpenMetadata/releases/latest). The latest version is at the top of the page
{%/note%}

## Volumes for MYSQL container:
Following are the changes we have to do while mounting the directory for mysql in OpenMetadata.
- Update or add the volume in the docker-compose.yml file
Open the file `docker-compose.yml` downloaded from the Release page [Link](https://github.com/open-metadata/OpenMetadata/releases/download/0.13.0-release/docker-compose.yml) .

```commandline
version: "3.9"
services:
  mysql:
    ...
    volumes:
      - ./docker-volume/db:/var/lib/mysql
    ...
```
## Volumes for PostgreSQL container:
Following are the changes we have to do while mounting the directory for postgresql in OpenMetadata.
- Update or add the volume in the docker-compose.yml file.
Open the file `docker-compose.yml` downloaded from the Release page [Link](https://github.com/open-metadata/OpenMetadata/releases/download/0.13.0-release/docker-compose.yml) .

```commandline
version: "3.9"
services:
 postgresql:
    ...
    volumes:
      - ./docker-volume/db:/var/lib/postgresql/data
    ...
```
## Volumes for Elasticsearch container:
Following are the changes we have to do while mounting the directory for Elasticsearch in OpenMetadata.
- Update or add the volume in the docker-compose.yml file.
Open the file `docker-compose.yml` downloaded from the Release page [Link](https://github.com/open-metadata/OpenMetadata/releases/download/0.13.0-release/docker-compose.yml) .

```commandline
version: "3.9"
services:
 elasticsearch:
    ...
    volumes:
      - ./docker-volume/es-data:/usr/share/elasticsearch/data
    ...
```
## Volumes for ingestion container
Following are the changes we have to do while mounting the directory for ingestion in OpenMetadata. Here we will maintaing different directory for dag_generated_configs, dags and secrets.
- Remove the below section from the docker-compose.yml file.
Open the file `docker-compose.yml` downloaded from the Release page [Link](https://github.com/open-metadata/OpenMetadata/releases/download/0.13.0-release/docker-compose.yml) .

```commandline
volumes:
  ingestion-volume-dag-airflow:
  ingestion-volume-dags:
  ingestion-volume-tmp:
```
- Update or add the volume in the docker-compose.yml file.
Open the file `docker-compose.yml` downloaded from the Release page [Link](https://github.com/open-metadata/OpenMetadata/releases/download/0.13.0-release/docker-compose.yml) .

```commandline
version: "3.9"
services:
  ingestion:
    ...
    volumes:
      - ./docker-volume/dag_config:/opt/airflow/dag_generated_configs
      - ./docker-volume/dags:/opt/airflow/dags
      - ./docker-volume/secrets:/tmp
    ...
```

Once these changes are done in the docker-compose.yml file It should look simlarly in the below format

```commandline
version: "3.9"
services:
  mysql:
    container_name: openmetadata_mysql
    image: openmetadata/db:1.0.0
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: password
    expose:
      - 3306
    volumes:
      - ./docker-volume/db:/var/lib/mysql
    networks:
      app_net:
        ipv4_address: 172.16.240.10
  ingestion:
    container_name: openmetadata_ingestion
    image: openmetadata/ingestion:1.0.0
    depends_on:
      - mysql
    expose:
      - 8080
    ports:
      - 8080:8080
    networks:
      - app_net
    extra_hosts:
      - "localhost:172.16.240.10"
      - "localhost:172.16.240.11"
      - "localhost:172.16.240.13"
    volumes:
      - ./docker-volume/dag_config:/opt/airflow/dag_generated_configs
      - ./docker-volume/dags:/opt/airflow/dags
      - ./docker-volume/secrets:/tmp
```

Once these changes are done, restart the container via:

```commandline
docker compose down && docker compose up -d
```

Since our Ingestion Docker Image is based on Official Airflow Docker image as base, it is recommended to provide right permissions to host directories for airflow user running inside the container as per the instructions mentioned [here](https://airflow.apache.org/docs/apache-airflow/2.3.3/start/docker.html?highlight=docker#setting-the-right-airflow-user).

{%note%}
If you are starting  the OpenMetadata Docker containers using below command:
```command line
metadata docker --start
```
Then the docker volume directory will be created under the folder where the docker-compose file will be present.
{%/note%}
