File System
Creating a StorageClass
Prepare a StorageClass configuration file, for example, msc .yaml. For details about the StorageClass configuration, see the following example.
Run the following command to create a StorageClass using the configuration file.
kubectl apply -f mysc.yamlRun the following command to view the information about the created StorageClass.
kubectl get sc myscThe following is an example of the command output.
NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGE mysc csi.huawei.com Delete Immediate true 8s
NFS Protocol Configuration Example
When a container uses the NFS protocol to connect to file system resources, refer to the following StorageClass configuration example. In this example, NFS version 4.1 is specified for mounting.
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
name: mysc
provisioner: csi.huawei.com
parameters:
backend: nfs-nas-181
pool: pool001
volumeType: fs
allocType: thin
authClient: "*"
mountOptions:
- nfsvers=4.1 # Specify the version 4.1 for NFS mounting.
DPC Protocol Configuration Example
When the storage supports access using the DPC protocol, you can configure the mount parameters for DPC access in the StorageClass. In this example, acl is used as the authentication parameter for mounting, and cnflush is used to set the asynchronous disk flushing mode.
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
name: mysc
provisioner: csi.huawei.com
parameters:
backend: nfs-dpc-101
pool: pool001
volumeType: fs
allocType: thin
mountOptions:
- acl # Set the authentication parameter.
- cnflush # Set the asynchronous disk flushing mode.
StorageClass Parameters Supported by File Systems
Table 1 StorageClass configuration parameters
Take Kubernetes v1.22.1 as an example. The value can contain digits, lowercase letters, hyphens (-), and periods (.), and must start and end with a letter or digit. | |||||
Set this parameter to the driver name set during Huawei CSI installation. The value is the same as that of driverName in the values.yaml file. | |||||
Reclamation policy. The following types are supported: | |||||
Whether to allow volume expansion. If this parameter is set to true, the capacity of the PV that uses the StorageClass can be expanded. | This function can only be used to expand PV capacity but cannot be used to reduce PV capacity. | ||||
List of mount parameters, which can be used to specify the parameters of the -o option when the mount command is executed on a host. | For details about common parameters in mountOptions, see Table 2. | ||||
Name of the backend where the resource to be created is located. This field must be set if parameters.pool is set. | If this parameter is not set, Huawei CSI will randomly select a backend that meets the capacity requirements to create resources. You are advised to specify a backend to ensure that the created resource is located on the expected backend. | ||||
Name of the storage resource pool where the resource to be created is located. | If this parameter is not set, Huawei CSI will randomly select a storage pool that meets the capacity requirements from the selected backend to create resources. You are advised to specify a storage pool to ensure that the created resource is located in the expected storage pool. | ||||
Type of the volume to be created. The following types are supported: | |||||
Allocation type of the volume to be created. The following types are supported: | If this parameter is set to thin, the required space is not allocated immediately when a volume is created. Instead, the space is dynamically allocated based on the usage. | ||||
IP address of the NFS client that can access the volume. This parameter is mandatory when the NFS protocol is used. You can enter the client host name (a full domain name is recommended), client IP address, or client IP address segment. | The asterisk (*) can be used to indicate any client. If you are not sure about the IP address of the access client, you are advised to use the asterisk (*) to prevent the client access from being rejected by the storage system. If the client host name is used, you are advised to use the full domain name. The IP addresses can be IPv4 addresses, IPv6 addresses, or a combination of IPv4 and IPv6 addresses. You can enter multiple host names, IP addresses, or IP address segments and separate them with semicolons (;). Example: 192.168.0.10;192.168.0.0/24;myserver1.test | ||||
The value of the parameter is JSON character strings in dictionary format. A character string is enclosed by single quotation marks and the dictionary key by double quotation marks. Example: '{"spaceQuota": "softQuota", "gracePeriod": 100}' | For details about the supported quota configurations, see Table 4. | ||||
QoS settings of the file system on the storage side of the PV. The value of the parameter is JSON character strings in dictionary format. A character string is enclosed by single quotation marks and the dictionary key by double quotation marks. Example: '{"maxMBPS": 999, "maxIOPS": 999}' | For details about the supported QoS configurations, see Table 3. | ||||
For details about the configuration format, refer to the Linux permission settings, for example, 777 and 755. | |||||
Controls the root permission of the client. | |||||
Whether to retain the user ID (UID) and group ID (GID) of a shared directory. | |||||
Whether the snapshot directory is visible. | |||||
Whether to disable volume capacity verification. After this function is disabled, the system will not verify whether the volume capacity is an integer multiple of the sector size.
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Table 2 Common parameters in mountOptions
NFS mount option on the host. The following mount option is supported: nfsvers: protocol version for NFS mounting. The value can be 3, 4, 4.0, 4.1, or 4.2. | This parameter is optional after the -o parameter when the mount command is executed on the host. The value is in list format. If the NFS version is specified for mounting, NFS 3, 4.0, 4.1, and 4.2 protocols are supported (the protocol must be supported and enabled on storage devices). If nfsvers is set to 4, the latest protocol version NFS 4 may be used for mounting due to different OS configurations, for example, 4.2. If the 4.0 protocol is required, you are advised to set nfsvers to 4.0. | |||
If the transmission protocol is rdma, set this parameter to 20049. | ||||
The DPC namespace supports the ACL function. The DPC client supports POSIX ACL, NFSv4 ACL, and NT ACL authentication. | The descriptions of acl, aclonlyposix, cnflush, and cflush are for reference only. For details about the parameters, see OceanStor Pacific Series Product Documentation and choose Configuration > Basic Service Configuration Guide for File > Configuring Basic Services (DPC Scenario) > Accessing a DPC Share on a Client > Step 2. | |||
The DPC namespace supports POSIX ACL, and the DPC client supports POSIX ACL authentication. The following protocols support POSIX ACL: DPC, NFSv3, and HDFS. If NFSv4 ACL or NT ACL is used, the DPC client cannot identify the ACL of this type. As a result, the ACL of this type does not take effect. | If aclonlyposix and acl are used together, only acl takes effect. That is, the namespace supports the ACL function. | |||
Asynchronous disk flushing mode. That is, data is not flushed to disks immediately when files in the namespace are closed. | Asynchronous flushing mode: When a file is closed, data in the cache is not flushed to storage media in synchronous mode. Instead, data is written from the cache to the storage media in asynchronous flushing mode. After the write service is complete, data is flushed from the cache to disks periodically based on the flushing period. In a multi-client scenario, if concurrent operations are performed on the same file, the file size update is affected by the disk flushing period. That is, the file size is updated only after the disk flushing is complete. Generally, the update is completed within several seconds. Synchronous I/Os are not affected by the disk flushing period. | |||
Synchronous disk flushing mode. That is, data is flushed to disks immediately when files in the namespace are closed. |
Table 3 Supported QoS configurations
Table 4 Supported quota configurations
This parameter is mandatory. Only softQuota or hardQuota can be configured. | ||
This parameter is conditionally optional only when spaceQuota is set to softQuota. |