This page represents practice test consisting of questions and answers on Kubernetes. This practice test covers the topic such as Kubernetes Services. The practice test can prove to be very helpful if you are preparing to take Certified Kubernetes Administrator (CKA) certification examination in near future. It covers the Networking Concepts from CKA certification exam syllabus which can comprise of 11% questions in CKA certification exam.
Check out other question sets on this page, Kubernetes Certification Exam (CKA) Sample Questions Sets.
Revision Notes – Kubernetes concepts on Services
- A Kubernetes service is an abstraction which is used to define a logical set of pods.
- A Kubernetes service is assigned an IP address.
- In service spec definition, port refers to incoming port which is mapped to targetPort on Pod. By default, the value of targetPort is set to same value as port.
- targetPort can be a string, referring to the name of a port in the backend Pods.
- Kubernetes services support both TCP and UDP for protocols.
- A service can be defined without a label selector for some of the following reasons:
- Point to another service in another Namespace.
- Integrate with backends running outside of Kubernetes
- A service not defined without a label selector requires one of the following to happen:
- Define endpoint with an ip address and a port for connecting to external services
- Define ExternalName service which serves as a way to return an alias to an external service residing outside the cluster.
- Every node in a Kubernetes cluster runs an instance of kube-proxy and kubelet.
- Kube-proxy is responsible for implementing a form of Virtual IP for Services.
- In iptables mode, Kube-proxy installs iptables rules for capturing traffic to the Service’s virtual clusterIP and Port.
- Kube-proxy running in following modes supports following as load balancing algorithm
| Proxy modes | Load-balancing algorithm |
|---|---|
| Userspace | Round-robin |
| Iptables | Random |
| IPVS | round-robin, least connection, source / destination hashing, shortest expected delay, never queue |
- Service supports exposing more than one port, say http(80), https(443).
Practice Test – Kubernetes Services
[wp_quiz id=”6143″]
Additional Practice Tests
These are additional practice tests which relates to core concepts part of CKA certification test. Note that as per syllabus, core concepts will cover 19% questions in CKA certification test.
- Practice Test on introduction to Kubernetes
- Practice Test on Pods, Taints and Tolerations
- Practice Test on Container hooks / Pods
- Practice Test on Pod Lifecycle
References
Those preparing for interviews in relation to Kubernetes or cloud-native apps would also find these questions to be useful enough. These questions can as well prove to be useful for interns / freshers / beginners getting started with Kubernetes.
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I found it very helpful. However the differences are not too understandable for me