Multi-Cloud Failover Routing Using Heartbeat and DNS Switching
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Solution Overview
Problem
Cloud outages due to infrastructure issues cause clients to lose access to their cloud-based assets, necessitating a method to manage system failure and ensure continuous service availability.
Innovation Solution
Establish connections with multiple cloud service providers, maintain a CSP table with heartbeat signals, and update DNS configurations to route traffic to the next available CSP upon detecting a failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clients rely on a single cloud service provider, then service configuration is simple, but service availability is reduced during outages
Solution Approach 1:
The system segments cloud service dependencies by maintaining separate connections to multiple cloud service providers (CSPs) in a CSP table. Each CSP is independently monitored and can be independently selected based on availability, preventing single-point failure while keeping each individual CSP connection manageable in size.
Solution Approach 2:
The distributed service server acts as an intermediary between clients and multiple CSPs. It maintains a CSP table with connection details for multiple providers and automatically selects appropriate CSPs based on heartbeat signals, shielding clients from the complexity of managing multiple direct CSP connections while ensuring service availability.
2Reliability
If the system monitors multiple CSPs with heartbeat signals, then service continuity is improved, but detection complexity increases
Solution Approach 1:
The system implements feedback mechanisms by having each CSP send periodic heartbeat signals to the distributed service server. The server monitors these heartbeats and automatically detects failures when heartbeats stop, providing continuous feedback on CSP status without requiring complex manual monitoring of multiple providers.
Solution Approach 2:
Each CSP autonomously provides its own status information through heartbeat signals, eliminating the need for the distributed service server to actively query or complexly monitor each CSP. The CSPs self-report their availability status, simplifying the detection mechanism while ensuring continuous service monitoring.
3Loss of time
If the system automatically switches CSPs upon failure, then downtime is reduced, but control complexity increases
Solution Approach 1:
The system performs preliminary actions by pre-configuring the CSP table with multiple CSP connection details and establishing all necessary connections before failures occur. When a failure is detected through missing heartbeat signals, the system can immediately switch to the next available CSP without delay, reducing downtime while keeping the switching logic simple and predetermined.
Solution Approach 2:
The distributed service server autonomously manages CSP failure detection and switching without requiring external intervention or complex control systems. It self-monitors heartbeat signals, self-detects failures, and automatically updates DNS configurations to route traffic to alternative CSPs, simplifying failure management while ensuring rapid response.
Data Source
AI summary
Managing system failure, including establishing, by a distributed service server and for each of a plurality of cloud service providers (CSPs), a respective connection with each of the CSPs; after establishing the respective connection with each of the CSPs, receiving, from each of the CSPs, details of the CSP and of the connection between the CSP and the distributed service server; updating a CSP table including the received details for each of the CSPs, the CSP table indicating a listed order of the CSPs; determining that a heartbeat signal has not been received from an application layer of a current CSP in a time period, and in response: marking the current CSP as inactive in the CSP table; identifying a next available CSP of the table; providing instructions to a domain registrar, in communication with each of the CSPs, to update a DNS configuration to indicate the next available CSP.