红帽全球峰会1.2.3. The monitoring stack in high-availability clusters
By default, in multi-node clusters, the following components run in high-availability (HA) mode to prevent data loss and service interruption:
- Prometheus
- Alertmanager
- Thanos Ruler
The component is replicated across two pods, each running on a separate node. This means that the monitoring stack can tolerate the loss of one pod.
- Prometheus in HA mode
- Both replicas independently scrape the same targets and evaluate the same rules.
- The replicas do not communicate with each other. Therefore, data might differ between the pods.
- Alertmanager in HA mode
- The two replicas synchronize notification and silence states with each other. This ensures that each notification is sent at least once.
- If the replicas fail to communicate or if there is an issue on the receiving side, notifications are still sent, but they might be duplicated.
重要
Prometheus, Alertmanager, and Thanos Ruler are stateful components. To ensure high availability, you must configure them with persistent storage.
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