High‑Availability Solutions for Prometheus Monitoring

Prometheus, one of the most popular monitoring systems, is widely used in many large internet companies. This article introduces several common high‑availability solutions to help improve system stability and performance.

1. Dual‑node + external storage

This solution uses two working nodes that cooperate to ensure monitoring high availability, while external storage provides unified data management. It guarantees data persistence; if one node fails, the other continues to serve queries, preventing data loss. It is suitable for small‑scale monitoring scenarios that require high availability.

2. Federated mode + external storage

In a federated cluster, tasks are distributed across different instances, reducing the load on each instance. Monitoring targets can be partitioned by function type or hash value and aggregated by a master node. Data is stored in a third‑party storage database, addressing the weak big‑data processing capability of the native TSDB. This approach alleviates overload on single instances and, through remote storage, overcomes the limited processing capacity of the native TSDB.

3. Multi‑node + Thanos + object storage

Thanos, an open‑source monitoring solution from Improbable, consists of multiple components that can be deployed alongside Prometheus in a non‑intrusive way, enabling global queries and cross‑cluster storage. The Thanos architecture greatly expands Prometheus’s data‑processing capabilities and is suitable for ultra‑large‑scale monitoring environments.

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