2.4 KiB
ClickHouse
High-performance columnar OLAP database for analytics and data warehousing:
- Columnar storage for fast analytical queries
- Real-time data ingestion and processing
- Horizontal scaling for large datasets
- SQL interface with advanced analytics functions
- Integration with External Secrets for secure credential management
- Support for various data formats (CSV, JSON, Parquet, etc.)
Installation
just clickhouse::install
Access
Access ClickHouse at https://clickhouse.yourdomain.com using the admin credentials stored in Vault.
CH-UI Web Interface
An optional web-based query interface for ClickHouse is available:
just ch-ui::install
Pod Security Standards
The ClickHouse namespace is configured with baseline enforcement:
pod-security.kubernetes.io/enforce=baselinepod-security.kubernetes.io/warn=baseline
Optional Capabilities
ClickHouse can use the following Linux capabilities for enhanced performance, but they are not required for normal operation:
| Capability | Purpose | Impact if disabled |
|---|---|---|
IPC_LOCK |
mlock to prevent binary from being paged out |
Slightly slower startup under memory pressure |
SYS_NICE |
Thread priority control via os_thread_priority |
Setting has no effect |
These capabilities are disabled by default to comply with baseline Pod Security Standards. To enable them, the namespace must allow privileged pods, and you need to uncomment the add line in clickhouse-installation-template.yaml.
Monitoring
ClickHouse exposes Prometheus metrics on port 9363. When Prometheus (kube-prometheus-stack) is installed, monitoring can be enabled during installation or manually.
Enable Monitoring
just clickhouse::setup-monitoring
This creates a ServiceMonitor and a metrics Service for Prometheus to scrape.
Grafana Dashboard
Import the ClickHouse dashboard from Grafana.com:
- Open Grafana → Dashboards → New → Import
- Enter Dashboard ID:
14192 - Click Load, select Prometheus data source, then Import
The dashboard includes panels for memory, connections, queries, I/O, replication, merge operations, cache, and ZooKeeper metrics.
Remove Monitoring
just clickhouse::remove-monitoring