Compute
Elastic Cloud Server
Huawei Cloud Flexus
Bare Metal Server
Auto Scaling
Image Management Service
Dedicated Host
FunctionGraph
Cloud Phone Host
Huawei Cloud EulerOS
Networking
Virtual Private Cloud
Elastic IP
Elastic Load Balance
NAT Gateway
Direct Connect
Virtual Private Network
VPC Endpoint
Cloud Connect
Enterprise Router
Enterprise Switch
Global Accelerator
Management & Governance
Cloud Eye
Identity and Access Management
Cloud Trace Service
Resource Formation Service
Tag Management Service
Log Tank Service
Config
OneAccess
Resource Access Manager
Simple Message Notification
Application Performance Management
Application Operations Management
Organizations
Optimization Advisor
IAM Identity Center
Cloud Operations Center
Resource Governance Center
Migration
Server Migration Service
Object Storage Migration Service
Cloud Data Migration
Migration Center
Cloud Ecosystem
KooGallery
Partner Center
User Support
My Account
Billing Center
Cost Center
Resource Center
Enterprise Management
Service Tickets
HUAWEI CLOUD (International) FAQs
ICP Filing
Support Plans
My Credentials
Customer Operation Capabilities
Partner Support Plans
Professional Services
Analytics
MapReduce Service
Data Lake Insight
CloudTable Service
Cloud Search Service
Data Lake Visualization
Data Ingestion Service
GaussDB(DWS)
DataArts Studio
Data Lake Factory
DataArts Lake Formation
IoT
IoT Device Access
Others
Product Pricing Details
System Permissions
Console Quick Start
Common FAQs
Instructions for Associating with a HUAWEI CLOUD Partner
Message Center
Security & Compliance
Security Technologies and Applications
Web Application Firewall
Host Security Service
Cloud Firewall
SecMaster
Anti-DDoS Service
Data Encryption Workshop
Database Security Service
Cloud Bastion Host
Data Security Center
Cloud Certificate Manager
Edge Security
Managed Threat Detection
Blockchain
Blockchain Service
Web3 Node Engine Service
Media Services
Media Processing Center
Video On Demand
Live
SparkRTC
MetaStudio
Storage
Object Storage Service
Elastic Volume Service
Cloud Backup and Recovery
Storage Disaster Recovery Service
Scalable File Service Turbo
Scalable File Service
Volume Backup Service
Cloud Server Backup Service
Data Express Service
Dedicated Distributed Storage Service
Containers
Cloud Container Engine
SoftWare Repository for Container
Application Service Mesh
Ubiquitous Cloud Native Service
Cloud Container Instance
Databases
Relational Database Service
Document Database Service
Data Admin Service
Data Replication Service
GeminiDB
GaussDB
Distributed Database Middleware
Database and Application Migration UGO
TaurusDB
Middleware
Distributed Cache Service
API Gateway
Distributed Message Service for Kafka
Distributed Message Service for RabbitMQ
Distributed Message Service for RocketMQ
Cloud Service Engine
Multi-Site High Availability Service
EventGrid
Dedicated Cloud
Dedicated Computing Cluster
Business Applications
Workspace
ROMA Connect
Message & SMS
Domain Name Service
Edge Data Center Management
Meeting
AI
Face Recognition Service
Graph Engine Service
Content Moderation
Image Recognition
Optical Character Recognition
ModelArts
ImageSearch
Conversational Bot Service
Speech Interaction Service
Huawei HiLens
Video Intelligent Analysis Service
Developer Tools
SDK Developer Guide
API Request Signing Guide
Terraform
Koo Command Line Interface
Content Delivery & Edge Computing
Content Delivery Network
Intelligent EdgeFabric
CloudPond
Intelligent EdgeCloud
Solutions
SAP Cloud
High Performance Computing
Developer Services
ServiceStage
CodeArts
CodeArts PerfTest
CodeArts Req
CodeArts Pipeline
CodeArts Build
CodeArts Deploy
CodeArts Artifact
CodeArts TestPlan
CodeArts Check
CodeArts Repo
Cloud Application Engine
MacroVerse aPaaS
KooMessage
KooPhone
KooDrive

Application Migration

Updated on 2024-02-01 GMT+08:00

Application migration across Huawei Cloud clusters of UCS in different AZs consists of two steps: application backup and application migration. This means applications in the source cluster are backed up and then migrated to the destination cluster through data restoration.

k8clone is an easy-to-use Kubernetes metadata cloning tool. It can save Kubernetes metadata (objects) as a local package and restore the metadata to the destination cluster.

Prerequisites

  • Ensure that the storage data on which the cloud native application depends has been migrated.
  • Ensure that the metadata backup in the source cluster has been downloaded to the server where k8clone is executed.

How k8clone Restores Data

Data restoration process:

Figure 1 Data restoration process

Before the restoration, prepare a data restoration configuration file restore.json to automatically change the storage class names of PVC and StatefulSet and the repository address of the image used by the workload during application restoration.

The file content is as follows:

{
    "StorageClass": 
          "OldStorageClassName": "NewStorageClassName"  // The StorageClassName field of PVC and StatefulSet can be changed.
    "ImageRepo": 
          "OldImageRepo1": "NewImageRepo1",   //eg:"dockerhub.com": "cn-north-4.swr.huaweicloud.com"
          "OldImageRepo2": "NewImageRepo2",   //eg:"dockerhub.com/org1": "cn-north-4.swr.huaweicloud.com/org2"
          "NoRepo": "NewImageRepo3"   //eg:"golang": "swr.cn-north-4.myhuaweicloud.com/paas/golang"
}
  • StorageClass: The storage class names of PVC and VolumeClaimTemplates can be automatically changed based on settings.
  • ImageRepo: The repository address of the image used by the workload can be changed. The workload can be Deployment (including initContainer), StatefulSet, Orphaned Pod, Job, CronJob, Replica Set, Replication Controller, and DaemonSet.

k8clone Usage for Restoration

NOTE:

k8clone can run on Linux (x86 and Arm) and Windows. The usage is similar in both environments. This section uses the Linux (x86) environment as an example.

If Linux (Arm) or Windows is used, replace k8clone-linux-amd64 in the following command with k8clone-linux-arm64 or k8clone-windows-amd64.exe.

Run ./k8clone-linux-amd64 restore -h in the directory where k8clone is located to learn about its usage.

  • -k, --kubeconfig: specifies the location of the kubeconfig file of kubectl. The default value is $HOME/.kube/config. The kubeconfig file is used to configure access to the Kubernetes cluster. The kubeconfig file contains the authentication credentials and endpoints (access addresses) required for accessing and registering the Kubernetes cluster. For details, see the Kubernetes documentation.
  • -s, --api-server: Kubernetes API Server URL. The default value is "".
  • -q, --context: Kubernetes Configuration Context. The default value is "".
  • -f, --restore-conf: path of restore.json. The default value is the directory where k8clone is located.
  • -d, --local-dir: path for storing backup data. The default value is the directory where k8clone is located.
$ ./k8clone-linux-amd64 restore -h
ProcessRestore from backup

Usage:
     k8clone restore [flags]

Flags:
   -s, --api-server string     Kubernetes api-server url
   -q, --context string        Kubernetes configuration context
   -h, --help                  help for restore
   -k, --kubeconfig string     The kubeconfig of k8s cluster's. Default is the $HOME/.kube/config. 
   -d, --local-dir string      Where to restore (default "./k8clone-dump.zip")
   -f, --restore-conf string   restore conf file (default "./restore.json")

Example:

./k8clone-linux-amd64 restore -d ./k8clone-dump.zip -f ./restore.json

Procedure

  1. Connect to the destination cluster using kubectl. For details, see Connecting to a Cluster Using kubectl.
  2. Prepare the data restoration configuration file restore.json.

    Create a restore.json file, modify it based on the format, and place it in the directory where k8clone is located.

    Example:

    {
      "StorageClass": {
        "csi-disk": "csi-disk-new"
      },
      "ImageRepo": {
        "quay.io/coreos": "swr.cn-north-4.myhuaweicloud.com/paas"
      }
    }

  3. Go to the directory where k8clone is located and run the restoration command to restore the backup data to the destination cluster.

    Example:

    ./k8clone-linux-amd64 restore -d ./k8clone-dump.zip -f ./restore.json

We use cookies to improve our site and your experience. By continuing to browse our site you accept our cookie policy. Find out more

Feedback

Feedback

Feedback

0/500

Selected Content

Submit selected content with the feedback