# 4.Configuration

## 2.4.1 Overview

EFAK has a number of configuration options that you can specify in a .properties configuration file or specified using environment variables.

{% hint style="info" %}
You must restart EFAK for any configuration changes to take effect.
{% endhint %}

## 2.4.2 Config file locations

Do not rename `system-config.properties`! EFAK defaults are stored in this file.

## 2.4.3 Base Common

| Name                         | Default                                | Describe                                                     |
| ---------------------------- | -------------------------------------- | ------------------------------------------------------------ |
| efak.zk.cluster.alias        | cluster1,cluster2                      | Kafka multi cluster alias attribute.                         |
| cluster1.zk.list             | ke01:2181,ke02:2181,ke03:2181/cluster1 | Kafka cluster1 zookeeper address.                            |
| cluster2.zk.list             | ke01:2181,ke02:2181,ke03:2181/cluster2 | Kafka cluster2 zookeeper address.                            |
| kafka.zk.limit.size          | 8                                      | EFAK maximum number of connections for the Zookeeper client. |
| cluster1.efak.broker.size    | 10                                     | Kafka broker size online list.                               |
| cluster2.efak.broker.size    | 20                                     | Kafka broker size online list.                               |
| efak.webui.port              | 8048                                   | EFAK webui port.                                             |
| cluster1.efak.offset.storage | kafka                                  | Kafka offsets stored in kafka.                               |
| cluster1.efak.offset.storage | zk                                     | Kafka offsets stored in zookeeper.                           |
| efak.metrics.charts          | false                                  | EFAK default disable metrics.                                |
| efak.metrics.retain          | 15                                     | EFAK default retain metrics data.                            |
| efak.sql.fix.error           | false                                  | EFAK default disable fixed kafka sql query error.            |
| efak.sql.topic.records.max   | 5000                                   | EFAK SQL query topic max records.                            |
| efak.topic.token             | keadmin                                | EFAK delete topic token.                                     |

## 2.4.4 Database Property

### MySQL

| Name          | Default                                                                                                     | Describe                      |
| ------------- | ----------------------------------------------------------------------------------------------------------- | ----------------------------- |
| efak.driver   | com.mysql.jdbc.Driver                                                                                       | EFAK store database driver.   |
| efak.url      | jdbc:mysql://127.0.0.1:3306/ke?useUnicode=true\&characterEncoding=UTF-8\&zeroDateTimeBehavior=convertToNull | EFAK store database url.      |
| efak.username | root                                                                                                        | EFAK store database username. |
| efak.password | 123456                                                                                                      | EFAK store database password. |

### SQLite

| Name          | Default                                  | Describe                      |
| ------------- | ---------------------------------------- | ----------------------------- |
| efak.driver   | org.sqlite.JDBC                          | EFAK store database driver.   |
| efak.url      | jdbc:sqlite:/hadoop/kafka-eagle/db/ke.db | EFAK store database url.      |
| efak.username | root                                     | EFAK store database username. |
| efak.password | 123456                                   | EFAK store database password. |


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```
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