Kubectl apply

Q: How deeply does Bootstrapping Microservices, Second Edition: With Docker, Kubernetes, GitHub Actions, and Terraform cover kubectl apply?

Demonstrates manifest application, status validation, port checking, and repeated updates without detailing kubectl internals.

As explained in Bootstrapping Microservices, Second Edition: With Docker, Kubernetes, GitHub Actions, and Terraform

kubectl apply is a Kubernetes command that creates or updates cluster resources from declarative configuration files or manifests.

kubectl apply creates or updates Kubernetes resources from declarative YAML configuration files. It turns deployment manifests into running objects such as deployments, pods, and services. section 6.8.5 section 6.8.9

Deploy a local microservice

From the directory containing the manifest, run `kubectl apply -f scripts/deploy.yaml`. Successful output reports created resources, such as `deployment.apps/video-streaming created` and `service/video-streaming created`. section 6.8.5

Validate and iterate after applying a manifest:

Run `kubectl get pods` to confirm the pod reaches `Running` status. section 6.8.5
Run `kubectl get deployments` and `kubectl get services` to check readiness and exposed ports. section 6.8.5
After rebuilding an updated Docker image with a new version number, run kubectl apply again to deploy the change. section 6.8.6
Use an infrastructure script to apply stable MongoDB and RabbitMQ configurations once at cluster setup. section 10.10.3

cd chapter-10/scripts/local-kub
./deploy.sh

A local deployment script combines Docker image builds with kubectl apply calls for multiple microservices and their YAML configurations. section 10.8.2

How Bootstrapping Microservices, Second Edition: With Docker, Kubernetes, GitHub Actions, and Terraform covers it

Cover of Bootstrapping Microservices, Second Edition: With Docker, Kubernetes, GitHub Actions, and Terraform

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Also explained in

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Acing the Certified Kubernetes Administrator Exam, Second Editionkubectl apply is a kubectl command that creates a Kubernetes resource or updates an existing resource from configuration.
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Learn Docker in a Month of Lunches, Second Editionkubectl apply is a kubectl command that creates or updates Kubernetes resources from declarative configuration.
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Kubernetes in Action, Second Editionkubectl apply is a kubectl command that creates or updates Kubernetes objects from a manifest file or set of manifest files.
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Kubernetes for Developerskubectl apply is a kubectl command that creates or updates Kubernetes resources from declarative configuration.
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Road to Kuberneteskubectl apply is a kubectl command that creates or updates Kubernetes resources from configuration manifests.

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Related concepts

podproduces · A Kubernetes Pod is the smallest deployable unit in Kubernetes, grouping one or more co-located containers that share networking and other resources.
Kubernetes manifestuses · A Kubernetes manifest is a declarative configuration document, typically written in YAML or JSON, that specifies Kubernetes resources and their desired state.
shell scriptused by · Bash is a Unix command-line shell and scripting language for executing commands interactively and through scripts.
ReplicaSetused by · A ReplicaSet is a Kubernetes workload resource that maintains a specified number of Pods matching a defined Pod template.
MongoDBconfigures · MongoDB is a document-oriented database management system that stores data as BSON documents, typically organized into collections.
Kubernetesproduces · Kubernetes is an open-source platform for orchestrating and automating the deployment, scaling, and management of containerized workloads across computing clusters.

This explainer was generated by Manning's knowledge graph from the text of Bootstrapping Microservices, Second Edition: With Docker, Kubernetes, GitHub Actions, and Terraform. The section links point to the parts of the book it draws on.