# Installing Dragonfly Scheduler Server

This topic explains how to install the Dragonfly scheduler server.

## Prerequisites

When deploying with Docker, the following conditions must be met.

| Required Software | Version Limit |
| ----------------- | ------------- |
| Git               | 1.9.1+        |
| Docker            | 1.12.0+       |

## Procedure - When Deploying with Docker

### Get scheduler image

You can get it from [DockerHub](https://hub.docker.com/) directly.

1. Obtain the latest Docker image of the scheduler.

   ```sh
   docker pull dragonflyoss/scheduler
   ```

Or you can build your own scheduler image.

1. Obtain the source code of Dragonfly.

   ```sh
   git clone https://github.com/dragonflyoss/Dragonfly2.git
   ```

2. Enter the project directory.

   ```sh
   cd Dragonfly2
   ```

3. Build the Docker image.

   ```sh
   TAG="2.0.0"
   make docker-build-scheduler D7Y_VERSION=$TAG
   ```

4. Obtain the latest Docker image ID of the scheduler.

   ```sh
   docker image ls | grep 'scheduler' | awk '{print $3}' | head -n1
   ```

### Start scheduler

**NOTE:** Replace ${schedulerDockerImageId} with
the ID obtained at the previous step.

```sh
docker run -d --name scheduler --restart=always -p 8002:8002 ${schedulerDockerImageId}
```

After scheduler is installed, run the following commands to
verify if **scheduler** is started, and if Port `8002` is available.

```sh
telnet 127.0.0.1 8002
```