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.
The UAI-Train distributed GPU platform cut a 7‑million‑image face‑recognition training cycle from a week to a day, slashed GPU costs by up to 90%, and boosted algorithm optimization efficiency by 85.7% for the fintech company Paipaidai.
UK8S’s custom CNI plugin integrates VPC networking to give containers native cloud performance, but a bug caused kubelet to create a second sandbox container, leading to missing NETNS parameters and VPC IP leaks; the article details the investigation, root‑cause analysis, and the patch fixing the issue.
This article explains how UCloud integrates Ansible with GlobalSSH to streamline overseas multi‑data‑center deployments, presents step‑by‑step Playbook examples, and shows performance tests that demonstrate up to a 57% speed boost for both Playbook and Ad‑hoc operations.
This article examines the common causes of MySQL master‑slave replication delay, explains how to monitor the issue with SHOW SLAVE STATUS, and provides practical solutions for six typical scenarios ranging from heavy write traffic to hardware mismatches.
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.
