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UCloud Tech
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UCloud Tech

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.

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Recent Articles

Latest from UCloud Tech

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UCloud Tech
UCloud Tech
Jun 12, 2019 · Cloud Native

Boost Hybrid Cloud Efficiency: Integrating Hosted Physical Machines into UK8S

This article explains how incorporating hosted‑cloud physical servers into UCloud's UK8S cluster enables seamless hybrid‑cloud operation by improving resource utilization during low‑traffic periods, simplifying network, storage, and load‑balancing configurations, and reducing the operational overhead of managing separate Kubernetes clusters.

KubernetesUK8Shybrid cloud
0 likes · 10 min read
Boost Hybrid Cloud Efficiency: Integrating Hosted Physical Machines into UK8S
UCloud Tech
UCloud Tech
May 23, 2019 · Cloud Computing

How SPDK Boosts Cloud Disk I/O Performance: Hot Upgrade & Online Migration

This article explains how using the Storage Performance Development Kit (SPDK) optimizes virtualized I/O paths for cloud disks, covering its architecture, virtio vring basics, hot‑upgrade solutions, online migration techniques, and io_uring enhancements that together achieve up to 1.2 million IOPS with dramatically reduced latency.

SPDKcloud storagehot upgrade
0 likes · 14 min read
How SPDK Boosts Cloud Disk I/O Performance: Hot Upgrade & Online Migration
UCloud Tech
UCloud Tech
Apr 11, 2019 · Cloud Native

Why Does a Kubernetes Pod IP Disappear? The Hidden Second Sandbox Bug

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.

CNIIP leakKubernetes
0 likes · 15 min read
Why Does a Kubernetes Pod IP Disappear? The Hidden Second Sandbox Bug
UCloud Tech
UCloud Tech
Mar 28, 2019 · Databases

Why MySQL Replication Lag Happens and How to Fix It: Real-World Cases

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.

Master‑SlaveMySQLReplication Lag
0 likes · 13 min read
Why MySQL Replication Lag Happens and How to Fix It: Real-World Cases
UCloud Tech
UCloud Tech
Mar 21, 2019 · Cloud Native

How Kernel Innovations Enable Scalable Multi‑Tenant Cloud Gateways

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.

GatewayLinux kernelVRF
0 likes · 15 min read
How Kernel Innovations Enable Scalable Multi‑Tenant Cloud Gateways
UCloud Tech
UCloud Tech
Mar 14, 2019 · Cloud Computing

How UCloud’s DCN V4 Architecture Boosted Data Center Capacity and Performance

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.

CLOSDCNdata center
0 likes · 12 min read
How UCloud’s DCN V4 Architecture Boosted Data Center Capacity and Performance
UCloud Tech
UCloud Tech
Mar 12, 2019 · Cloud Computing

Avoid Disaster with Terraform: Safe Blue‑Green Deployments on UCloud

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.

Cloud ComputingInfrastructure as CodeTerraform
0 likes · 20 min read
Avoid Disaster with Terraform: Safe Blue‑Green Deployments on UCloud
UCloud Tech
UCloud Tech
Mar 7, 2019 · Cloud Native

How UCloud Uses Terraform to Cut Cloud Resource Deployment Time by 80%

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.

CI/CDDevOpsInfrastructure as Code
0 likes · 14 min read
How UCloud Uses Terraform to Cut Cloud Resource Deployment Time by 80%