File System Path
In the following table, we summarize some of the most relevant file paths used in the Kafka and ZooKeeper charms.
Kafka
| Path | Description | Permission |
|---|---|---|
| /snap/charmed-kafka/current/opt/kafka | Binary files for the Charmed Kafka distribution. Note that this is a readonly squashfs file system. | (read-only) |
| /snap/charmed-kafka/current/opt/kafka/bin/*.sh | General bash scripts to provide helpers and utilities for managing and interacting with Kafka. | (read-only) |
| /var/snap/charmed-kafka/current/etc/kafka/ | Configuration files used by Kafka daemon process. These files are generally written and managed by the charm. | (owned by snap_daemon, managed by charm) |
| /var/snap/charmed-kafka/common/var/log/kafka/ | Application Logging files generated by the Kafka daemon process. These files are written by the workload, but they may be read by other components to provide monitoring (e.g. grafana and/or charm). | (owned and managed by snap_daemon) |
| /var/snap/charmed-kafka/common/var/lib/kafka/ | Raw data stored persistently by Kafka during its operations. The files are written and managed by Kafka only. | (owned and managed by snap_daemon) |
External storage is used for storing persistent raw data that is mounted at /var/snap/charmed-kafka/common/var/lib/kafka/<storage-id>, with <storage-id> being a progressive number.
Multiple storage volumes can be used for providing both horizontal scalability and provide IO parallelization to enhance throughput.
Zookeeper
| Path | Description | Permission |
|---|---|---|
| /snap/charmed-zookeeper/current/opt/zookeeper | Binary files for the Charmed ZooKeeper distribution. Note that this is a readonly squashfs file system. | (read-only) |
| /snap/charmed-zookeeper/current/opt/zookeeper/bin/*.sh | General bash scripts to provide helpers and utilities for managing and interacting with ZooKeeper. | (read-only) |
| /var/snap/charmed-zookeeper/current/etc/zookeeper/ | Configuration files used by ZooKeeper daemon process. These files are generally written and managed by the charm. | (owned by snap_daemon, managed by charm) |
| /var/snap/charmed-zookeeper/common/var/log/zookeeper/ | Application Logging files generated by the ZooKeeper daemon process. These files are written by the workload, but they may be read by other components to provide monitoring (e.g. grafana and/or charm). | (owned and managed by snap_daemon) |
| /var/snap/charmed-zookeeper/common/var/lib/zookeeper/ | Raw data stored persistently by ZooKeeper during its operations. The files are written and managed by ZooKeeper only. | (owned and managed by snap_daemon) |
External storage is used for storing persistent raw data, and it is
mounted at /var/snap/charmed-kafka/common/var/lib/zookeeper.