Google Professional Cloud Network Engineer Question 167
Select 3Google Cloud PlatformYou are designing an IP addressing plan for a Google Kubernetes Engine (GKE) cluster in a VPC with multiple subnets. The cluster will be used for a microservices application with heavy inter-service communication. Which considerations should you account for to ensure scalability and avoid IP address exhaustion?
- A
Ensure that the Pod CIDR range has sufficient IP addresses to accommodate the maximum number of Pods per node and the total number of nodes in the cluster.
- B
Configure a separate VPC for each GKE cluster to avoid IP address conflicts between clusters.
- C
Use VPC-native (alias IP) routing to allocate IP addresses for Pods and Services efficiently.
- D
Manually assign static IP addresses to each Pod to avoid IP conflicts in the cluster.
- E
Choose a subnet with a sufficiently large CIDR range to support the cluster's node pool and future scaling.
Show answer and explanation
Correct answers: A, C, E
Explanation
When designing an IP addressing plan for GKE, scalability and efficient IP management are critical. Kubernetes dynamically assigns IP addresses to Pods and Services, so it is important to plan for sufficient CIDR ranges in both the Pod and subnet levels. Using VPC-native (alias IP) routing simplifies IP management and ensures compatibility with GKE best practices. Avoiding manual IP assignment and unnecessary VPC segregation reduces complexity and improves operational efficiency.
- A. Correct.
Ensuring that the Pod CIDR range has sufficient IP addresses is crucial for cluster scalability and operation. If the range is too small, the cluster may run out of IP addresses as Pods and nodes scale.
- B. Incorrect.
It is not necessary to configure a separate VPC for each GKE cluster. Multiple clusters can share the same VPC as long as their IP ranges do not overlap.
- C. Correct.
VPC-native (alias IP) routing is the recommended approach for IP address management in GKE. It allows for efficient allocation of IP addresses to Pods and Services, reducing the risk of conflicts.
- D. Incorrect.
Manually assigning static IP addresses to Pods is not recommended, as Kubernetes dynamically manages Pod IP addresses. This approach would lead to operational complexity and potential conflicts.
- E. Correct.
Choosing a subnet with a sufficiently large CIDR range is essential to ensure that the node pool and any future scaling needs are supported without running out of IP addresses.