January 2019
Intermediate to advanced
484 pages
11h 48m
English
Content preview from DevOps with Kubernetes - Second Edition
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Custom readiness gate
The testing targets of the readiness probe are always containers, which means that it can't be used to disable a pod from a service by using external states. Since a service selects pods by their labels, we can control the traffic to pods by manipulating pod labels to a certain extent. However, pod labels are also read by other components inside Kubernetes, so building complex toggles with labels could lead to unexpected results.
The pod readiness gate is the feature that allows us to mark whether a pod is ready or not, based on the conditions we defined. With the pod readiness gates defined, a pod is regarded as ready only if its readiness probe passes and the status of all readiness gates associated with the pod is ...
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