Readiness check

Q: How deeply does Learn Docker in a Month of Lunches, Second Edition cover readiness check?

Explains probe types, timing, endpoint removal, and a runnable Deployment configuration, but does not detail probe thresholds.

As explained in Learn Docker in a Month of Lunches, Second Edition

A readiness probe is a Kubernetes container probe that determines whether a Pod should receive traffic from a Service.

A readiness check determines whether a Pod should receive traffic from a Service. When the check repeatedly fails, Kubernetes marks the Pod unready and removes its IP address from the Service endpoint list. section 15.3

Configure a container probe using one of these checks:

An HTTP request checks a response code, such as GET /healthz. section 15.3
A TCP check verifies that the application is listening on a port. section 15.3
A custom command runs a script containing multiple tests. section 15.3

HTTP readiness probe

Add readinessProbe under the container specification: readinessProbe: httpGet: path: /healthz, port: http; periodSeconds: 5. Apply the updated Deployment and watch Pod status with kubectl get po -l app=numbers -o wide -w.

How Learn Docker in a Month of Lunches, Second Edition covers it

Cover of Learn Docker in a Month of Lunches, Second Edition

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Also explained in

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Kubernetes in Action, Second EditionA readiness endpoint is an application-provided HTTP endpoint that reports whether the application is ready to serve requests.
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Kubernetes for DevelopersA readiness probe is a health test that determines whether an application instance is ready to receive user traffic.
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Machine Learning Platform EngineeringA periodic check that determines whether a workload is ready to receive traffic.
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Quarkus in ActionA readiness probe is a Kubernetes health check that determines whether a container is ready to receive traffic.
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Spring in Action, Sixth EditionA readiness probe is a Kubernetes health check that determines whether an application instance is prepared to receive traffic.
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Bootstrapping Microservices, Second Edition: With Docker, Kubernetes, GitHub Actions, and TerraformA Kubernetes readiness probe is a health check that indicates whether a container or application instance is ready to receive traffic.

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Related concepts

Kubernetesused by · Kubernetes is an open-source platform for orchestrating and automating the deployment, scaling, and management of containerized workloads across computing clusters.
health checkkind of · A health check is an assessment or probe that determines whether a system, service, or component is functioning acceptably according to defined criteria.
liveness checkcontrasts with · A liveness check is an automated health test that determines whether a running workload remains functional or should be restarted.
TCP socket probeincludes · A TCP socket probe is a Kubernetes container probe that checks whether a TCP connection can be established on a specified port.
http get probeincludes · An HTTP GET probe is a Kubernetes liveness-check mechanism that sends an HTTP GET request to a specified path and port in a container and succeeds for a non-error response.

This explainer was generated by Manning's knowledge graph from the text of Learn Docker in a Month of Lunches, Second Edition. The section links point to the parts of the book it draws on.