UCloud is a leading neutral cloud provider in China, developing its own IaaS, PaaS, AI service platform, and big data exchange platform, and delivering comprehensive industry solutions for public, private, hybrid, and dedicated clouds.
UCloud’s external gateway redesign leverages Linux kernel 5.0 features—lightweight tunneling, VRF, and flow offload—to replace OVS/GRE tunnels, addressing IP tunnel complexity, tenant isolation overhead, and netns performance penalties, while contributing patches back to the open‑source community.
This article details UCloud's transition from the V3 to V4 data‑center network architecture, explaining why the older design fell short, how the new 25 G/100 G three‑level CLOS, POD, and DC Group concepts were implemented, and the resulting four‑fold increase in server‑port capacity and performance.
This article explains the risks of using Terraform without proper safeguards, demonstrates a real-world failure caused by careless use of the --auto-approve flag, and presents a robust blue‑green deployment pattern with an arbitration module that enforces safe state transitions on UCloud.
This article explains how UCloud built a Terraform‑based resource orchestration tool that dramatically reduces deployment time, improves reliability, and integrates with CLI and CI/CD pipelines, while detailing fault‑tolerance, integration, and engineering practices for large‑scale cloud infrastructure.
This article details the discovery, analysis, and resolution of a DPDK bug that caused a zero‑byte IP fragment to fill transmission queues, leading to packet loss and tx‑hang in UCloud's high‑availability ULB4 load balancer, and shares the tools and lessons learned for future debugging.
This article details UCloud's five‑month, multi‑department hot migration of its Seoul data center, covering planning, ZooKeeper scaling, udatabase and MySQL migration strategies, deployment platforms, and the final cut‑over steps that ensured zero user impact.
The article uses the historic siege of Alesia to illustrate how Roman emphasis on infrastructure parallels modern DevOps practices, arguing that rapid, reliable delivery requires robust, automated cloud and public‑cloud foundations, while critiquing the myth of speed through long work hours and highlighting Netflix’s chaos engineering as a model for resilient systems.
This article explains how UCloud addresses IPv4 limitations by deploying a free IPv6 conversion service built on stateful NAT64 and programmable P4 switches, detailing the strategic rollout, system architecture, high‑availability and security mechanisms, load‑balancing algorithms, P4 table optimizations, and performance test results.
UCloud’s physical network orchestrator automates large‑scale data‑center switch configuration, reducing IDC network build cycles from 2‑3 days to 2‑3 hours, boosting success rates to 99%, while handling 3000+ switches, 200 Gbps access throughput, and supporting hybrid‑cloud real‑time connectivity through a scenario‑driven, Kafka‑backed architecture.
This article explains how UCloud’s self‑developed IO acceleration technology dramatically narrows the CPU‑disk performance gap by raising 4K random write throughput from 300 IOPS to 45,000 IOPS, detailing its architecture, first‑generation limitations, and the second‑generation enhancements that enable scalable, fault‑tolerant cloud storage.
