NFS Service

Note

Only the NFSv4 protocol is supported.

The simplest way to manage NFS is via the ceph nfs cluster ... commands; see CephFS & RGW Exports over NFS. This document covers how to manage the cephadm services directly, which should only be necessary for unusual NFS configurations.

Deploying NFS ganesha

Cephadm deploys NFS Ganesha daemon (or set of daemons). The configuration for NFS is stored in the nfs-ganesha pool and exports are managed via the ceph nfs export ... commands and via the dashboard.

To deploy a NFS Ganesha gateway, run the following command:

ceph orch apply nfs *<svc_id>* [--port *<port>*] [--placement ...]

For example, to deploy NFS with a service id of foo on the default port 2049 with the default placement of a single daemon:

ceph orch apply nfs foo

See Daemon Placement for the details of the placement specification.

Service Specification

Alternatively, an NFS service can be applied using a YAML specification.

service_type: nfs
service_id: mynfs
placement:
  hosts:
    - host1
    - host2
spec:
  port: 12345

In this example, we run the server on the non-default port of 12345 (instead of the default 2049) on host1 and host2.

The specification can then be applied by running the following command:

ceph orch apply -i nfs.yaml

High-availability NFS

Deploying an ingress service for an existing nfs service will provide:

a stable, virtual IP that can be used to access the NFS server
fail-over between hosts if there is a host failure
load distribution across multiple NFS gateways (although this is rarely necessary)

Ingress for NFS can be deployed for an existing NFS service (nfs.mynfs in this example) with the following specification:

service_type: ingress
service_id: nfs.mynfs
placement:
  count: 2
spec:
  backend_service: nfs.mynfs
  frontend_port: 2049
  monitor_port: 9000
  virtual_ip: 10.0.0.123/24

A few notes:

The virtual_ip must include a CIDR prefix length, as in the example above. The virtual IP will normally be configured on the first identified network interface that has an existing IP in the same subnet. You can also specify a virtual_interface_networks property to match against IPs in other networks; see Selecting ethernet interfaces for the virtual IP for more information.
The monitor_port is used to access the haproxy load status page. The user is admin by default, but can be modified by via an admin property in the spec. If a password is not specified via a password property in the spec, the auto-generated password can be found with:
ceph config-key get mgr/cephadm/ingress.*{svc_id}*/monitor_password
For example:
ceph config-key get mgr/cephadm/ingress.nfs.myfoo/monitor_password
The backend service (nfs.mynfs in this example) should include a port property that is not 2049 to avoid conflicting with the ingress service, which could be placed on the same host(s).

NFS with virtual IP but no haproxy

Cephadm also supports deploying nfs with keepalived but not haproxy. This offers a virtual ip supported by keepalived that the nfs daemon can directly bind to instead of having traffic go through haproxy.

In this setup, you’ll either want to set up the service using the nfs module (see Create NFS Ganesha Cluster) or place the ingress service first, so the virtual IP is present for the nfs daemon to bind to. The ingress service should include the attribute keepalive_only set to true. For example

service_type: ingress
service_id: nfs.foo
placement:
  count: 1
  hosts:
  - host1
  - host2
  - host3
spec:
  backend_service: nfs.foo
  monitor_port: 9049
  virtual_ip: 192.168.122.100/24
  keepalive_only: true

Then, an nfs service could be created that specifies a virtual_ip attribute that will tell it to bind to that specific IP.

service_type: nfs
service_id: foo
placement:
  count: 1
  hosts:
  - host1
  - host2
  - host3
spec:
  port: 2049
  virtual_ip: 192.168.122.100

Note that in these setups, one should make sure to include count: 1 in the nfs placement, as it’s only possible for one nfs daemon to bind to the virtual IP.