Podcast
Questions and Answers
What happens first after posting the Service configuration to the API Server?
What happens first after posting the Service configuration to the API Server?
What is initiated when the Cluster DNS notices a new Service?
What is initiated when the Cluster DNS notices a new Service?
Which statement accurately describes the traffic flow when querying a Service Name?
Which statement accurately describes the traffic flow when querying a Service Name?
What occurs if there is no route found when accessing a Service?
What occurs if there is no route found when accessing a Service?
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What does the Node's kernel do when processing traffic destined for a Pod?
What does the Node's kernel do when processing traffic destined for a Pod?
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What is the role of Cluster DNS in the service access process?
What is the role of Cluster DNS in the service access process?
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What action is taken when there is no route found to the ClusterIP?
What action is taken when there is no route found to the ClusterIP?
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What function do Kube proxies perform in the service registration process?
What function do Kube proxies perform in the service registration process?
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What happens during the processing phase by the Node's kernel?
What happens during the processing phase by the Node's kernel?
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Which of the following is NOT a step involved in DNS registration?
Which of the following is NOT a step involved in DNS registration?
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Study Notes
Service DNS Registration
- Submitting Service configurations to the API Server utilizes a POST request.
- Each Service is assigned a unique ClusterIP for internal communication.
- Configuration details of the Service are stored persistently in the cluster’s storage system.
- Endpoints are generated, associating Service with the IP addresses of active Pods.
Service Access
-
The Cluster DNS detects the introduction of a new Service and reacts accordingly.
-
DNS records are created automatically to facilitate Service discovery.
-
Kube proxies retrieve and maintain the most current Service configuration.
-
IPVS (IP Virtual Server) rules are established to manage traffic routing.
-
When a Service name is queried through DNS, a ClusterIP address is returned.
-
Network traffic is directed toward the obtained ClusterIP address.
-
If the route to ClusterIP is unavailable, traffic is sent to the container's default gateway.
-
Next, it is forwarded to the Node where the Service is hosted.
-
If there’s no route from the Node's perspective, it uses the Node's default gateway.
-
The Node's kernel processes and manages the incoming traffic.
-
TRAP rules activate under IPVS, essential for directing traffic efficiently.
-
The destination IP in packets is rewritten to the actual Pod IP to ensure proper delivery to the correct endpoint.
Service DNS Registration
- Submitting Service configurations to the API Server utilizes a POST request.
- Each Service is assigned a unique ClusterIP for internal communication.
- Configuration details of the Service are stored persistently in the cluster’s storage system.
- Endpoints are generated, associating Service with the IP addresses of active Pods.
Service Access
-
The Cluster DNS detects the introduction of a new Service and reacts accordingly.
-
DNS records are created automatically to facilitate Service discovery.
-
Kube proxies retrieve and maintain the most current Service configuration.
-
IPVS (IP Virtual Server) rules are established to manage traffic routing.
-
When a Service name is queried through DNS, a ClusterIP address is returned.
-
Network traffic is directed toward the obtained ClusterIP address.
-
If the route to ClusterIP is unavailable, traffic is sent to the container's default gateway.
-
Next, it is forwarded to the Node where the Service is hosted.
-
If there’s no route from the Node's perspective, it uses the Node's default gateway.
-
The Node's kernel processes and manages the incoming traffic.
-
TRAP rules activate under IPVS, essential for directing traffic efficiently.
-
The destination IP in packets is rewritten to the actual Pod IP to ensure proper delivery to the correct endpoint.
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Description
This quiz covers the essentials of service DNS registration and access in Kubernetes. Questions focus on the API server configuration, DNS record creation, and the routing process for service traffic. Test your understanding of how services communicate within a Kubernetes cluster.
