| ### Pre-requisite |
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| Gearpump cluster can be installed on Windows OS and Linux. |
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| Before installation, you need to decide how many machines are used to run this cluster. |
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| For each machine, the requirements are listed in table below. |
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| **Table: Environment requirement on single machine** |
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| Resource | Requirements |
| ------------ | --------------------------- |
| Memory | 2GB free memory is required to run the cluster. For any production system, 32GB memory is recommended. |
| Java | JRE 6 or above |
| User permission | Root permission is not required |
| Network Ethernet |(TCP/IP) |
| CPU | Nothing special |
| HDFS installation | Default is not required. You only need to install it when you want to store the application jars in HDFS. |
| Kafka installation | Default is not required. You need to install Kafka when you want the at-least once message delivery feature. Currently, the only supported data source for this feature is Kafka |
| |
| **Table: The default port used in Gearpump:** |
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| | usage | Port | Description | |
| ------------ | ---------------|------------ |
| Dashboard UI | 8090 | Web UI. |
| Dashboard web socket service | 8091 | UI backend web socket service for long connection. |
| Master port | 3000 | Every other role like worker, appmaster, executor, user use this port to communicate with Master. |
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| You need to ensure that your firewall has not banned these ports to ensure Gearpump can work correctly. |
| And you can modify the port configuration. Check [Configuration](deployment-configuration) section for details. |
