# Environment Variables

<table><thead><tr><th width="203">Variable Name</th><th width="96">Type</th><th width="216">Relevance</th><th width="108">Required</th><th>Default</th></tr></thead><tbody><tr><td>KAFKA_HOST</td><td>String</td><td>Kafka hostname</td><td>No</td><td>kafka</td></tr><tr><td>KAFKA_PORT</td><td>Number</td><td>Kafka port</td><td>No</td><td>9092</td></tr><tr><td>CLICKHOUSE_HOST</td><td>String</td><td>Clickhouse hostname</td><td>No</td><td>analytics-datastore-clickhouse</td></tr><tr><td>CLICKHOUSE_PORT</td><td>String</td><td>Clickhouse port</td><td>No</td><td>8123</td></tr></tbody></table>