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19 lines
1.1 KiB
Plaintext
19 lines
1.1 KiB
Plaintext
include::modules/serverless-document-attributes.adoc[]
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[id="serverless-HA"]
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= High availability on {ServerlessProductName}
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include::modules/common-attributes.adoc[]
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:context: serverless-HA
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toc::[]
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High availability (HA) is a standard feature of Kubernetes APIs that helps to ensure that APIs stay operational if a disruption occurs.
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In an HA deployment, if an active controller crashes or is deleted, another controller is available to take over processing of the APIs that were being serviced by the controller that is now unavailable.
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HA in {ServerlessProductName} is available through leader election, which is enabled by default after the Knative Serving control plane is installed.
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When using a leader election HA pattern, instances of controllers are already scheduled and running inside the cluster before they are required.
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These controller instances compete to use a shared resource, known as the leader election lock.
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The instance of the controller that has access to the leader election lock resource at any given time is referred to as the leader.
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include::modules/serverless-config-replicas.adoc[leveloffset=+1]
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