Cloud Architects and Network Engineers
Designing a high-availability cloud network architecture that requires automated redundancy for internal traffic.
Use cases
About
The Load Balancer Failover mind map template provides a technical breakdown of high-availability networking architectures, specifically focusing on Internal TCP/UDP Load Balancing. This 65-node cheat sheet covers the critical mechanisms used to distribute connections among virtual machine (VM) instances and manage transitions between primary and failover backends. It details how the 'Active pool' functions as a dynamic collection of backend VMs, ensuring that new connections are routed only to healthy instances. The template serves as a Load Balancer Failover cheat sheet for cloud architects, illustrating how a 'Failover policy' governs the automatic switch between primary and backup resources. By mapping out the relationship between managed and unmanaged instance groups, this Xmind template helps engineers visualize the 'Failover ratio' and connection draining processes necessary for maintaining service continuity during infrastructure outages.
Terms and ConditionsWhen to use this template
Site Reliability Engineers (SREs)
Troubleshooting connection drops or unexpected failover behavior in a Google Cloud environment.
IT Operations Teams
Documenting standard operating procedures for disaster recovery and backend service maintenance.
How to use this template
Step 1
Import the failover structure
Open the .xmind file in Xmind to view the hierarchical breakdown of failover policies and backend configurations.
Step 2
Define your backend groups
Customize the 'Backend instance groups and VMs' nodes to match your specific primary and failover instance group names.
Step 3
Set failover ratio parameters
Use the 'Failover ratio' branch to document your specific health check thresholds and connection draining timeout values.
Frequently asked questions
A primary VM is a member of an instance group designated as a primary backend and participates in the active pool by default. A backup VM belongs to a failover backend and only enters the active pool when the number of healthy primary VMs drops below the threshold defined by the failover ratio.
During a failover event, Google Cloud automatically removes primary VMs from the active pool and replaces them with healthy backup VMs. The active pool is exclusive; it contains only backup VMs during failover and only primary VMs during normal operation (failback).
Yes, the template notes that both managed and unmanaged instance groups are supported. However, it warns that using managed instance groups with autoscaling might cause repeated failover and failback cycles, which should be carefully managed in your configuration.
Failover is triggered based on the 'Failover ratio,' which is a configurable percentage of healthy primary VMs. When the ratio of healthy primary instances falls below this set limit, the load balancer initiates the failover process to backup instances.
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