Brief Journey to achieve the CKAD Certification
The Linux Foundation - Domains & Competencies
1 - Application Design And Build
3 - Application Observability And Maintenance
4 - Application Environment Configuration And Security
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DryRun alias:
alias kdr="kubectl -o yaml --dry-run=client"
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Pod example:
kdr run mypod --image=busybox > busybox.yaml -
Deploy example:
kdr create deploy nginx --image=nginx:latest --replicas=2 > nginx-deploy.yaml -
ConfigMap example:
kdr create cm troy --from-literal=device=horse > troy-cm.yaml
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In Kubernetes, you can create services using either the kubectl create service command or the kubectl expose command. While both commands can be used to create services, they have slightly different functionalities and use cases.
- kubectl create service
- This command is primarily used to create basic services quickly.
- It supports creating services of type ClusterIP, NodePort, and LoadBalancer.
- It automatically creates a service definition based on the specified parameters (service type, port mappings, etc.).
- It does not require a pre-existing service definition YAML file.
Example usage:
kubectl create service clusterip my-service --tcp=80:8080- kubectl expose
- This command is more versatile and flexible compared to kubectl create service.
- It can be used to expose existing resources, including pods, deployments, and replication controllers, as services.
- It allows for more advanced customization of service configurations through flags and options.
- It can expose services of any type (ClusterIP, NodePort, LoadBalancer), and it can also update existing services.
- It requires a pre-existing resource (such as a deployment or pod) to expose as a service.
- It accepts a wider range of options and configurations, such as labels, annotations, and service types.
Example usage:
kubectl expose deployment my-deployment --port=80 --target-port=8080 --type=NodePort --name=my-service
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