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User Guide
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UCS Clusters
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Container Settings
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Policy Center
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Policy Definition Library
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UCS Clusters
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API Reference
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API
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Fleet
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- Creating a Federation Connection
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- Appendix
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FAQs
- About UCS
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Billing
- How Is UCS Billed?
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- What Types of Invoices Are There?
- Can I Unsubscribe from or Modify a Resource Package?
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Permissions
- How Do I Configure Access Permissions for Each Function of the UCS Console?
- What Can I Do If an IAM User Cannot Obtain Cluster or Fleet Information After Logging In to UCS?
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- What Can I Do If I Cannot Associate the Permission Policy with a Fleet or Cluster?
- How Do I Clear RBAC Resources After a Cluster Is Unregistered?
- Policy Center
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Fleets
- What Can I Do If Cluster Federation Verification Fails to Be Enabled for a Fleet?
- What Can I Do If an Abnormal, Federated Cluster Fails to Be Removed from the Fleet?
- What Can I Do If an Nginx Ingress Is in the Unready State After Being Deployed?
- What Can I Do If "Error from server (Forbidden)" Is Displayed When I Run the kubectl Command?
- Huawei Cloud Clusters
- Attached Clusters
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On-Premises Clusters
- What Can I Do If an On-Premises Cluster Fails to Be Connected?
- How Do I Manually Clear Nodes of an On-Premises Cluster?
- How Do I Downgrade a cgroup?
- What Can I Do If the VM SSH Connection Times Out?
- How Do I Expand the Disk Capacity of the CIA Add-on in an On-Premises Cluster?
- What Can I Do If the Cluster Console Is Unavailable After the Master Node Is Shut Down?
- What Can I Do If a Node Is Not Ready After Its Scale-Out?
- How Do I Update the CA/TLS Certificate of an On-Premises Cluster?
- What Can I Do If an On-Premises Cluster Fails to Be Installed?
- Multi-Cloud Clusters
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Cluster Federation
- What Can I Do If the Pre-upgrade Check of the Cluster Federation Fails?
- What Can I Do If a Cluster Fails to Be Added to a Federation?
- What Can I Do If Status Verification Fails When Clusters Are Added to a Federation?
- What Can I Do If an HPA Created on the Cluster Federation Management Plane Fails to Be Distributed to Member Clusters?
- What Can I Do If an MCI Object Fails to Be Created?
- What Can I Do If I Fail to Access a Service Through MCI?
- What Can I Do If an MCS Object Fails to Be Created?
- What Can I Do If an MCS or MCI Instance Fails to Be Deleted?
- Traffic Distribution
- Container Intelligent Analysis
- General Reference
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Application Migration
Application migration from clusters in an on-premises IDC consists of two steps: application backup and application migration. That is, applications in the clusters in an on-premises IDC are backed up and then migrated to the destination cluster through data restoration.
k8clone is a simple Kubernetes metadata cloning tool. It can save Kubernetes metadata (objects) as a local package and restore the metadata to the destination cluster (Huawei Cloud cluster or on-premises cluster of UCS). In this way, applications can be migrated from clusters in an on-premises data center to the cloud.
Constraints
Currently, applications in a cluster of a later version cannot be migrated to a cluster of an earlier version.
Prerequisites
- Ensure that services (data not in the cluster, such as images, storage, and databases) on which cloud native applications depend have 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:
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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
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
- Connect to the destination cluster using kubectl. For details, see Connecting to a Cluster Using kubectl.
- 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" } }
- 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
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