# Create Shared Storage service


Shared Storage provides persistent file storage that can be mounted as a POSIX-compatible filesystem to your runtime services. Built on [SeaweedFS ↗](https://github.com/seaweedfs/seaweedfs), it enables reliable data persistence and sharing across services in your infrastructure.

## Create Using Zerops GUI

First, set up a project in Zerops GUI and add a runtime service. Then go to the project dashboard page and choose **Add new service** in the left menu in the **Services** block. Then add a new Shared Storage service:

### Set a Hostname

Enter a unique service identifier like "storage", "files" etc. Duplicate services with the same name in the same project are forbidden.

#### Hostname Limitations:

- Maximum 25 characters
- Must contain only lowercase ASCII letters (a-z) or numbers (0-9)

:::note
The hostname is fixed after the service is created. It can't be changed later.
:::

### Connect to Services

Select one or more project's runtime services in the Share with Services block:

The new Shared Storage will be connected to the selected runtimes.

:::note
Runtime services can be connected and disconnected at any time even after the shared storage is created.
:::

### Choose Deployment Mode

Choose between **Highly Available** (recommended for production) or **Single Container** (suitable for development) deployment.

:::warning
The Shared Storage deployment mode is fixed after the service is created. It can't be changed later.

See [Technical Details](/shared-storage/tech-details#deployment-modes) for more information about deployment modes.
:::

### Set Auto Scaling Configuration

Configure vertical auto scaling parameters to control resource allocation and costs.

:::note
For detailed information about auto scaling capabilities and recommendations, see [Technical Details](/shared-storage/tech-details#auto-scaling-configuration).
:::

## Create Using zCLI

zCLI is the Zerops command-line tool. To create a new Shared Storage service via the command-line, follow these steps:

1. [Install & setup zCLI](/references/cli)
2. Create a project description file
3. Create a project with a runtime and a Shared Storage service

### Choose Your Runtime

export const languages = [
    { name: "Node.js", link: "/nodejs/how-to/shared-storage#create-nodejs-service-with-a-shared-storage-using-zcli" },
    { name: "PHP", link: "/php/how-to/shared-storage#create-php-service-with-a-shared-storage-using-zcli" },
    { name: "Python", link: "/python/how-to/shared-storage#create-python-service-with-a-shared-storage-using-zcli" },
    { name: "Go", link: "/go/how-to/shared-storage#create-go-service-with-a-shared-storage-using-zcli" },
    { name: ".NET", link: "/dotnet/how-to/shared-storage#create-dotnet-service-with-a-shared-storage-using-zcli" },
    { name: "Rust", link: "/rust/how-to/shared-storage#create-rust-service-with-a-shared-storage-using-zcli" }
]