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kevinveenbirkenbachandClaude Opus 5.5 9b7f25f2fe fix(svc-storage-nfs-client): stop requesting directory delegations from ganesha < 9.11

Every swarm job on ubuntu-26.04 runners (kernel 7.0) died at the NFS
probe write with `[Errno 121] Remote I/O error`. ganesha's NFSv4 debug log
in the rescue bundles shows the cause on every client, the same second as
the failure:

  Request 2: opcode 46 is OP_GET_DIR_DELEGATION
  Status of OP_GET_DIR_DELEGATION in position 2 = NFS4ERR_OP_ILLEGAL

Linux 6.19 added directory delegations: after ACCESS, CREATE, REMOVE or
RENAME the client adds GET_DIR_DELEGATION to the directory's next GETATTR
(`should_request_dir_deleg`, gated per request by the nfsv4 parameter
`directory_delegations`). nfs-ganesha before 9.11 routes op 46 to
`nfs4_op_illegal`, whose reply carries opcode 10044; the client decoder
expects 46 and fails the call with EREMOTEIO. Upstream fixed it in
nfs-ganesha#1385 (98eb77c4, first in V9.11), which answers NOTSUPP; the
client then drops the capability. The distro packages the role installs
predate it: Debian trixie 6.5-5, Ubuntu 26.04 6.5-8.

Every client and the controller now read the server's installed
nfs-ganesha release and, below 9.11, set `directory_delegations=N` right
after the mount and before the first access (the mount itself never sends
op 46), plus `options nfsv4 directory_delegations=N` in /etc/modprobe.d for
later module loads. No ganesha release grants directory delegations, so
the end state equals a fixed server. The parameter is kernel-wide and is
only ever set to N, so clients sharing one kernel cannot flip it back on
each other. Servers on 9.11 or later and the kernel nfsd flavor keep the
client default.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

2026-10-20 16:28:52 +02:00

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NFS Client

Description

NFS (Network File System) lets a host mount a directory exported by a remote server as if it were a local filesystem. The client packages provide the kernel helpers and userspace tools to perform that mount.

Overview

This role installs the distro-appropriate NFS client packages on every host in the Ansible group svc-swarm-node and probe-mounts the configured storage.nfs.server and the export base from the svc-storage-nfs-server services.yml SPOT to confirm reachability and writability at deploy time. The actual docker volume mounts happen later, driven by the Docker engine at container start.

Cosmos

The diagram places NFS Client in the Infinito.Nexus cosmos: the components it deploys (capabilities), the central services it consumes (dependencies), and its outward reach (federation and bridged external networks).

flowchart LR
    subgraph deps [Dependencies]
        dep_svc_storage_nfs_server["svc-storage-nfs-server 💻"]
    end
    subgraph role [svc-storage-nfs-client 💻]
        svc_nfs_server["nfs-server"]
        svc_nfs_client["nfs-client"]
    end
    dep_svc_storage_nfs_server -. "0..1" .-> svc_nfs_server

Solid 1:1 edges are fixed relationships; dashed 0..1 edges are conditional (enabled only in matching deployments); red 0..0 edges are turned off in this role. Node markers show the role's deploy modes (💻 host, 🐳 compose, 🐝 swarm); ❌ marks a service that is explicitly turned off, and ⚙️ an Ansible role dependency declared in meta/main.yml.

Features

Distro-aware packages: Installs nfs-common on Debian/Ubuntu, nfs-utils on Arch / RHEL / Fedora / Alpine.
Ephemeral probe mount: Mounts the export, writes a marker, then unmounts; failures surface immediately at deploy time, never at first container boot.
Strict assertion: Missing storage.nfs.server or fails the deploy with a precise error.
Node-local backups: After the state mount, binds the node's own /var/lib/infinito-backup over /var/lib/infinito/backup, so every backup repository on a swarm node is written to local disk with its extended attributes, and the backup host pulls it from there. Generations written to the share before the bind stay under the export's backup/ directory, hidden from the nodes; remove them there by hand.
Directory delegations off against old ganesha: When the server runs nfs-ganesha older than 9.11, every client and the controller set the kernel's nfsv4 parameter directory_delegations to N, at runtime and in /etc/modprobe.d. The parameter is kernel-wide, so on a lab whose nodes share one kernel it covers every NFS mount of that host until the module reloads.

Quick Setup

Development

Clone, set up the workstation, and deploy NFS Client onto the local stack:

git clone https://github.com/infinito-nexus/core.git
cd core
make onboard
make compose-deploy mode=reinstall apps=svc-storage-nfs-client full_cycle=false

Production

Install NFS Client directly onto the target machine: clone the repository, install the OS prerequisites and the repository toolchain, then deploy against localhost over a local connection (no SSH, no container):

git clone https://github.com/infinito-nexus/core.git
cd core
bash scripts/install/package.sh
make install
source scripts/meta/env/load.sh

APP=svc-storage-nfs-client
DOMAIN=<your-domain>
TLS_MODE=self_signed
SSH_PUBLIC_KEY="<your-ssh-public-key>"
INVENTORY=inventories/production
infinito administration inventory provision "$INVENTORY" \
  --inventory-file "$INVENTORY/devices.yml" \
  --host localhost \
  --include "$APP" \
  --vars "{\"TLS_MODE\": \"$TLS_MODE\", \"DOMAIN_PRIMARY\": \"$DOMAIN\", \"users\": {\"administrator\": {\"authorized_keys\": [\"$SSH_PUBLIC_KEY\"]}}}"
infinito administration deploy dedicated "$INVENTORY/devices.yml" \
  --password-file "$INVENTORY/.password" \
  --diff -vv

Credits

Implemented by Kevin Veen-Birkenbach. Part of the Infinito.Nexus Project and maintained by Kevin Veen-Birkenbach. Licensed under the Infinito.Nexus Community License (Non-Commercial).

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