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michaelklishin committed May 14, 2024
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RabbitMQ nodes assume their peers come back online within five minutes (by default). With the `OrderedReady` pod management policy is used
with a readiness probe that implicitly requires a fully booted node, the deployment can deadlock:

- Kubernetes will expect the first node to pass a readiness probe
- The readiness probe may require a fully booted node
- The node will fully boot after it detects that its peers have come online
- Kubernetes will not start any more pods until the first one boots
- Kubernetes will expect the first node to pass a readiness probe
- The readiness probe may require a fully booted node
- The node will fully boot after it detects that its peers have come online
- Kubernetes will not start any more pods until the first one boots

Using [RabbitMQ Cluster Operator](https://www.rabbitmq.com/kubernetes/operator/operator-overview) is the easies solution.
Using [RabbitMQ Cluster Operator](https://www.rabbitmq.com/kubernetes/operator/operator-overview) is the easies solution.

Alternatively, the following combination of deployment settings avoids the problem:

- Use `podManagementPolicy: "Parallel"` to boot multiple cluster nodes in parallel
- Use `rabbitmq-diagnostics ping` for readiness probe
- Use `podManagementPolicy: "Parallel"` to boot multiple cluster nodes in parallel
- Use `rabbitmq-diagnostics ping` for readiness probe

Note that forcing nodes to boot is **not a solution** and doing so **can be dangerous**. Forced booting is a last resort mechanism
in RabbitMQ that helps make remaining clusters nodes to recover and rejoin each other after a permanent loss of some of their former
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