## What is Dolphin Scheduler?

Dolphin Scheduler is a distributed and easy-to-expand visual DAG workflow scheduling system, dedicated to solving the complex dependencies in data processing, making the scheduling system out of the box for data processing.

GitHub URL: https://github.com/apache/incubator-dolphinscheduler

Official Website: https://dolphinscheduler.apache.org

![Dolphin Scheduler](https://dolphinscheduler.apache.org/img/hlogo_colorful.svg)

[![EN doc](https://img.shields.io/badge/document-English-blue.svg)](README.md)
[![CN doc](https://img.shields.io/badge/文档-中文版-blue.svg)](README_zh_CN.md)

## How to use this docker image

#### You can start a dolphinscheduler by docker-compose (recommended)

```
$ docker-compose -f ./docker/docker-swarm/docker-compose.yml up -d
```

The default **postgres** user `root`, postgres password `root` and database `dolphinscheduler` are created in the `docker-compose.yml`.

The default **zookeeper** is created in the `docker-compose.yml`.

Access the Web UI：http://192.168.xx.xx:12345/dolphinscheduler

The default username is `admin` and the default password is `dolphinscheduler123`

#### Or via Environment Variables **`DATABASE_HOST`** **`DATABASE_PORT`** **`DATABASE_DATABASE`** **`ZOOKEEPER_QUORUM`**

You can specify **existing postgres and zookeeper service**. Example:

```
$ docker run -d --name dolphinscheduler \
-e ZOOKEEPER_QUORUM="192.168.x.x:2181" \
-e DATABASE_HOST="192.168.x.x" -e DATABASE_PORT="5432" -e DATABASE_DATABASE="dolphinscheduler" \
-e DATABASE_USERNAME="test" -e DATABASE_PASSWORD="test" \
-p 12345:12345 \
apache/dolphinscheduler:latest all
```

Access the Web UI：http://192.168.xx.xx:12345/dolphinscheduler

#### Or start a standalone dolphinscheduler server

You can start a standalone dolphinscheduler server.

* Create a **local volume** for resource storage, For example:

```
docker volume create dolphinscheduler-resource-local
```

* Start a **master server**, For example:

```
$ docker run -d --name dolphinscheduler-master \
-e ZOOKEEPER_QUORUM="192.168.x.x:2181" \
-e DATABASE_HOST="192.168.x.x" -e DATABASE_PORT="5432" -e DATABASE_DATABASE="dolphinscheduler" \
-e DATABASE_USERNAME="test" -e DATABASE_PASSWORD="test" \
apache/dolphinscheduler:latest master-server
```

* Start a **worker server**, For example:

```
$ docker run -d --name dolphinscheduler-worker \
-e ZOOKEEPER_QUORUM="192.168.x.x:2181" \
-e DATABASE_HOST="192.168.x.x" -e DATABASE_PORT="5432" -e DATABASE_DATABASE="dolphinscheduler" \
-e DATABASE_USERNAME="test" -e DATABASE_PASSWORD="test" \
-e ALERT_LISTEN_HOST="dolphinscheduler-alert" \
-v dolphinscheduler-resource-local:/dolphinscheduler \
apache/dolphinscheduler:latest worker-server
```

* Start a **api server**, For example:

```
$ docker run -d --name dolphinscheduler-api \
-e ZOOKEEPER_QUORUM="192.168.x.x:2181" \
-e DATABASE_HOST="192.168.x.x" -e DATABASE_PORT="5432" -e DATABASE_DATABASE="dolphinscheduler" \
-e DATABASE_USERNAME="test" -e DATABASE_PASSWORD="test" \
-v dolphinscheduler-resource-local:/dolphinscheduler \
-p 12345:12345 \
apache/dolphinscheduler:latest api-server
```

* Start a **alert server**, For example:

```
$ docker run -d --name dolphinscheduler-alert \
-e DATABASE_HOST="192.168.x.x" -e DATABASE_PORT="5432" -e DATABASE_DATABASE="dolphinscheduler" \
-e DATABASE_USERNAME="test" -e DATABASE_PASSWORD="test" \
apache/dolphinscheduler:latest alert-server
```

**Note**: You must be specify `DATABASE_HOST` `DATABASE_PORT` `DATABASE_DATABASE` `DATABASE_USERNAME` `DATABASE_PASSWORD` `ZOOKEEPER_QUORUM` when start a standalone dolphinscheduler server.

## How to build a docker image

You can build a docker image in A Unix-like operating system, You can also build it in Windows operating system.

In Unix-Like, Example:

```bash
$ cd path/incubator-dolphinscheduler
$ sh ./docker/build/hooks/build
```

In Windows, Example:

```bat
C:\incubator-dolphinscheduler>.\docker\build\hooks\build.bat
```

Please read `./docker/build/hooks/build` `./docker/build/hooks/build.bat` script files if you don't understand

## Environment Variables

The Dolphin Scheduler image uses several environment variables which are easy to miss. While none of the variables are required, they may significantly aid you in using the image.

**`DATABASE_TYPE`**

This environment variable sets the type for database. The default value is `postgresql`.

**Note**: You must be specify it when start a standalone dolphinscheduler server. Like `master-server`, `worker-server`, `api-server`, `alert-server`.

**`DATABASE_DRIVER`**

This environment variable sets the type for database. The default value is `org.postgresql.Driver`.

**Note**: You must be specify it when start a standalone dolphinscheduler server. Like `master-server`, `worker-server`, `api-server`, `alert-server`.

**`DATABASE_HOST`**

This environment variable sets the host for database. The default value is `127.0.0.1`.

**Note**: You must be specify it when start a standalone dolphinscheduler server. Like `master-server`, `worker-server`, `api-server`, `alert-server`.

**`DATABASE_PORT`**

This environment variable sets the port for database. The default value is `5432`.

**Note**: You must be specify it when start a standalone dolphinscheduler server. Like `master-server`, `worker-server`, `api-server`, `alert-server`.

**`DATABASE_USERNAME`**

This environment variable sets the username for database. The default value is `root`.

**Note**: You must be specify it when start a standalone dolphinscheduler server. Like `master-server`, `worker-server`, `api-server`, `alert-server`.

**`DATABASE_PASSWORD`**

This environment variable sets the password for database. The default value is `root`.

**Note**: You must be specify it when start a standalone dolphinscheduler server. Like `master-server`, `worker-server`, `api-server`, `alert-server`.

**`DATABASE_DATABASE`**

This environment variable sets the database for database. The default value is `dolphinscheduler`.

**Note**: You must be specify it when start a standalone dolphinscheduler server. Like `master-server`, `worker-server`, `api-server`, `alert-server`.

**`DATABASE_PARAMS`**

This environment variable sets the database for database. The default value is `characterEncoding=utf8`.

**Note**: You must be specify it when start a standalone dolphinscheduler server. Like `master-server`, `worker-server`, `api-server`, `alert-server`.

**`DOLPHINSCHEDULER_ENV_PATH`**

This environment variable sets the runtime environment for task. The default value is `/opt/dolphinscheduler/conf/env/dolphinscheduler_env.sh`.

**`DOLPHINSCHEDULER_DATA_BASEDIR_PATH`**

User data directory path, self configuration, please make sure the directory exists and have read write permissions. The default value is `/tmp/dolphinscheduler`

**`DOLPHINSCHEDULER_OPTS`**

This environment variable sets java options. The default value is empty.

**`RESOURCE_STORAGE_TYPE`**

This environment variable sets resource storage type for dolphinscheduler like `HDFS`, `S3`, `NONE`. The default value is `HDFS`.

**`RESOURCE_UPLOAD_PATH`**

This environment variable sets resource store path on HDFS/S3 for resource storage. The default value is `/dolphinscheduler`.

**`FS_DEFAULT_FS`**

This environment variable sets fs.defaultFS for resource storage like `file:///`, `hdfs://mycluster:8020` or `s3a://dolphinscheduler`. The default value is `file:///`.

**`FS_S3A_ENDPOINT`**

This environment variable sets s3 endpoint for resource storage. The default value is `s3.xxx.amazonaws.com`.

**`FS_S3A_ACCESS_KEY`**

This environment variable sets s3 access key for resource storage. The default value is `xxxxxxx`.

**`FS_S3A_SECRET_KEY`**

This environment variable sets s3 secret key for resource storage. The default value is `xxxxxxx`.

**`ZOOKEEPER_QUORUM`**

This environment variable sets zookeeper quorum for `master-server` and `worker-serverr`. The default value is `127.0.0.1:2181`.

**Note**: You must be specify it when start a standalone dolphinscheduler server. Like `master-server`, `worker-server`.

**`ZOOKEEPER_ROOT`**

This environment variable sets zookeeper root directory for dolphinscheduler. The default value is `/dolphinscheduler`.

**`MASTER_EXEC_THREADS`**

This environment variable sets exec thread num for `master-server`. The default value is `100`.

**`MASTER_EXEC_TASK_NUM`**

This environment variable sets exec task num for `master-server`. The default value is `20`.

**`MASTER_HEARTBEAT_INTERVAL`**

This environment variable sets heartbeat interval for `master-server`. The default value is `10`.

**`MASTER_TASK_COMMIT_RETRYTIMES`**

This environment variable sets task commit retry times for `master-server`. The default value is `5`.

**`MASTER_TASK_COMMIT_INTERVAL`**

This environment variable sets task commit interval for `master-server`. The default value is `1000`.

**`MASTER_MAX_CPULOAD_AVG`**

This environment variable sets max cpu load avg for `master-server`. The default value is `100`.

**`MASTER_RESERVED_MEMORY`**

This environment variable sets reserved memory for `master-server`. The default value is `0.1`.

**`MASTER_LISTEN_PORT`**

This environment variable sets port for `master-server`. The default value is `5678`.

**`WORKER_EXEC_THREADS`**

This environment variable sets exec thread num for `worker-server`. The default value is `100`.

**`WORKER_HEARTBEAT_INTERVAL`**

This environment variable sets heartbeat interval for `worker-server`. The default value is `10`.

**`WORKER_MAX_CPULOAD_AVG`**

This environment variable sets max cpu load avg for `worker-server`. The default value is `100`.

**`WORKER_RESERVED_MEMORY`**

This environment variable sets reserved memory for `worker-server`. The default value is `0.1`.

**`WORKER_LISTEN_PORT`**

This environment variable sets port for `worker-server`. The default value is `1234`.

**`WORKER_GROUPS`**

This environment variable sets group for `worker-server`. The default value is `default`.

**`WORKER_WEIGHT`**

This environment variable sets weight for `worker-server`. The default value is `100`.

**`ALERT_LISTEN_HOST`**

This environment variable sets the host of `alert-server` for `worker-server`. The default value is `127.0.0.1`.

**`ALERT_PLUGIN_DIR`**

This environment variable sets the alert plugin directory for `alert-server`. The default value is `lib/plugin/alert`.

## Initialization scripts

If you would like to do additional initialization in an image derived from this one, add one or more environment variable under `/root/start-init-conf.sh`, and modify template files in `/opt/dolphinscheduler/conf/*.tpl`.

For example, to add an environment variable `API_SERVER_PORT` in `/root/start-init-conf.sh`:

```
export API_SERVER_PORT=5555
```

and to modify `/opt/dolphinscheduler/conf/application-api.properties.tpl` template file, add server port:
```
server.port=${API_SERVER_PORT}
```

`/root/start-init-conf.sh` will dynamically generate config file:

```sh
echo "generate app config"
ls ${DOLPHINSCHEDULER_HOME}/conf/ | grep ".tpl" | while read line; do
eval "cat << EOF
$(cat ${DOLPHINSCHEDULER_HOME}/conf/${line})
EOF
" > ${DOLPHINSCHEDULER_HOME}/conf/${line%.*}
done
```