# Environment Variables

<table><thead><tr><th width="230">Variable Name</th><th width="96">Type</th><th width="167">Relevance</th><th width="102">Required</th><th>Default</th></tr></thead><tbody><tr><td>KAFKA_INSTANCES</td><td>Number</td><td>Service replicas</td><td>No</td><td>1</td></tr><tr><td>KAFKA_CPU_LIMIT</td><td>Number</td><td>CPU usage limit</td><td>No</td><td>0</td></tr><tr><td>KAFKA_CPU_RESERVE</td><td>Number</td><td>Reserved CPU</td><td>No</td><td>0.05</td></tr><tr><td>KAFKA_MEMORY_LIMIT</td><td>String</td><td>RAM usage limit</td><td>No</td><td>3G</td></tr><tr><td>KAFKA_MEMORY_RESERVE</td><td>String</td><td>Reserved RAM</td><td>No</td><td>500M</td></tr><tr><td>KAFKA_TOPICS</td><td>String</td><td>Kafka topics</td><td>Yes</td><td></td></tr><tr><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ZOOKEEPER_CPU_LIMIT</td><td>Number</td><td>CPU usage limit</td><td>No</td><td>0</td></tr><tr><td>ZOOKEEPER_CPU_RESERVE</td><td>Number</td><td>Reserved CPU</td><td>No</td><td>0.05</td></tr><tr><td>ZOOKEEPER_MEMORY_LIMIT</td><td>String</td><td>RAM usage limit</td><td>No</td><td>3G</td></tr><tr><td>ZOOKEEPER_MEMORY_RESERVE</td><td>String</td><td>Reserved RAM</td><td>No</td><td>500M</td></tr><tr><td></td><td></td><td></td><td></td><td></td></tr><tr><td>KMINION_CPU_LIMIT</td><td>Number</td><td>CPU usage limit</td><td>No</td><td>0</td></tr><tr><td>KMINION_CPU_RESERVE</td><td>Number</td><td>Reserved CPU</td><td>No</td><td>0.05</td></tr><tr><td>KMINION_MEMORY_LIMIT</td><td>String</td><td>RAM usage limit</td><td>No</td><td>3G</td></tr><tr><td>KMINION_MEMORY_RESERVE</td><td>String</td><td>Reserved RAM</td><td>No</td><td>500M</td></tr><tr><td></td><td></td><td></td><td></td><td></td></tr><tr><td>KAFDROP_CPU_LIMIT</td><td>Number</td><td>CPU usage limit</td><td>No</td><td>0</td></tr><tr><td>KAFDROP_CPU_RESERVE</td><td>Number</td><td>Reserved CPU</td><td>No</td><td>0.05</td></tr><tr><td>KAFDROP_MEMORY_LIMIT</td><td>String</td><td>RAM usage limit</td><td>No</td><td>3G</td></tr><tr><td>KAFDROP_MEMORY_RESERVE</td><td>String</td><td>Reserved RAM</td><td>No</td><td>500M</td></tr></tbody></table>