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Applies to SUSE Enterprise Storage 7

25 NFS Ganesha Edit source

NFS Ganesha is an NFS server that runs in a user address space instead of as part of the operating system kernel. With NFS Ganesha, you can plug in your own storage mechanism—such as Ceph—and access it from any NFS client. For installation instructions, see Section 5.4.3.6, “Deploying NFS Ganesha”.

Note
Note: NFS Ganesha performance

Because of increased protocol overhead and additional latency caused by extra network hops between the client and the storage, accessing Ceph via an NFS Gateway may significantly reduce application performance when compared to native CephFS.

Each NFS Ganesha service consists of a configuration hierarchy that contains:

  • A bootstrap ganesha.conf

  • A per-service RADOS common configuration object

  • A per export RADOS configuration object

The bootstrap configuration is the minimal configuration to start the nfs-ganesha daemon within a container. Each bootstrap configuration will contain a %url directive that includes any additional configuration from the RADOS common configuration object. The common configuration object can include additional %url directives for each of the NFS exports defined in the export RADOS configuration objects.

NFS Ganesha structure
Figure 25.1: NFS Ganesha structure

25.1 Creating an NFS service Edit source

The recommended way to specify the deployment of Ceph services is to create a YAML-formatted file with the specification of the services that you intend to deploy. You can create a separate specification file for each type of service, or you specify multiple (or all) services types in one file.

Depending on what you have chosen to do, you will need to update or create a relevant YAML-formatted file to create a NFS Ganesha service. For more information on creating the file, see Section 5.4.2, “Service and placement specification”.

One you have updated or created the file, execute the following to create a nfs-ganesha service:

cephuser@adm > ceph orch apply -i FILE_NAME

25.2 Starting or Restarting NFS Ganesha Edit source

Important
Important

Starting the NFS Ganesha service does not automatically export a CephFS file system. To export a CephFS file system, create an export configuration file. Refer to Section 25.4, “Creating an NFS export” for more details.

To start the NFS Ganesha service, run:

cephuser@adm > ceph orch start nfs.SERVICE_ID

To restart the NFS Ganesha service, run:

cephuser@adm > ceph orch restart nfs.SERVICE_ID

If you only want to restart a single NFS Ganesha daemon, run:

cephuser@adm > ceph orch daemon restart nfs.SERVICE_ID

When NFS Ganesha is started or restarted, it has a grace timeout of 90 seconds for NFS v4. During the grace period, new requests from clients are actively rejected. Hence, clients may face a slowdown of requests when NFS is in the grace period.

25.3 Listing objects in the NFS recovery pool Edit source

Execute the following to list the objects in the NFS recovery pool:

cephuser@adm > rados --pool POOL_NAME --namespace NAMESPACE_NAME ls

25.4 Creating an NFS export Edit source

You can create an NFS export either in the Ceph Dashboard, or manually on the command line. To create the export by using the Ceph Dashboard, refer to Chapter 7, Manage NFS Ganesha, more specifically to Section 7.1, “Creating NFS exports”.

To create an NFS export manually, create a configuration file for the export. For example, a file /tmp/export-1 with the following content:

EXPORT {
    export_id = 1;
    path = "/";
    pseudo = "/";
    access_type = "RW";
    squash = "no_root_squash";
    protocols = 3, 4;
    transports = "TCP", "UDP";
    FSAL {
        name = "CEPH";
        user_id = "admin";
        filesystem = "a";
        secret_access_key = "SECRET_ACCESS_KEY";
    }
}

After you have created and saved the configuration file for the new export, run the following command to create the export:

rados --pool POOL_NAME --namespace NAMESPACE_NAME put EXPORT_NAME EXPORT_CONFIG_FILE

For example:

cephuser@adm > rados --pool example_pool --namespace example_namespace put export-1 /tmp/export-1
Note
Note

The FSAL block should be modified to include the desired cephx user ID and secret access key.

25.5 Verifying the NFS export Edit source

NFS v4 will build a list of exports at the root of a pseudo file system. You can verify that the NFS shares are exported by mounting / of the NFS Ganesha server node:

root # mount -t nfs nfs_ganesha_server_hostname:/ /path/to/local/mountpoint
root # ls /path/to/local/mountpoint cephfs
Note
Note: NFS Ganesha is v4 only

By default, cephadm will configure an NFS v4 server. NFS v4 does not interact with rpcbind nor the mountd daemon. NFS client tools such as showmount will not show any configured exports.

25.6 Mounting the NFS export Edit source

To mount the exported NFS share on a client host, run:

root # mount -t nfs nfs_ganesha_server_hostname:/ /path/to/local/mountpoint

25.7 Multiple NFS Ganesha clusters Edit source

Multiple NFS Ganesha clusters can be defined. This allows for:

  • Separated NFS Ganesha clusters for accessing CephFS.

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