computer-playbook/roles/svc-bkp-nfs-2-local/README.md

Backup NFS

Description

A scheduled differential backup of the NFS export onto the local backup directory. Each run stores a discrete snapshot under <backups>/<machine-hash>/backup-nfs-to-local/<generation>/files/, hard-linked against the previous generation via rsync --link-dest.

Overview

This role installs the backup script and the systemd service that drives it on the configured schedule (SYS_SCHEDULE_BACKUP_NFS_TO_LOCAL), and serialises the run against the rest of the manipulation group via sys-lock. The source path is the NFS export base resolved from the svc-storage-nfs-server services SPOT; deploy the role on the host that serves the export. Deploy sys-ctl-cln-bkps to keep the snapshot tree bounded and user-backup so downstream hosts can pull the tree.

Cosmos

The diagram places Backup NFS 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 💻"]
        dep_sys_ctl_cln_faild_bkps["sys-ctl-cln-faild-bkps 💻 ⚙️"]
    end
    subgraph role [svc-bkp-nfs-2-local 💻]
        svc_nfs_server["nfs-server"]
        svc_nfs_2_local["nfs-2-local"]
    end
    subgraph dependents [Dependents]
        dpt_svc_storage_nfs_server["svc-storage-nfs-server 💻"]
    end
    dep_svc_storage_nfs_server -. "0..1" .-> svc_nfs_server
    dep_sys_ctl_cln_faild_bkps -- "1:1" --> svc_nfs_2_local
    svc_nfs_2_local -. "0..1" .-> dpt_svc_storage_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.

Schema

flowchart TD
    TIMER["systemd timer<br>SYS_SCHEDULE_BACKUP_NFS_TO_LOCAL (01:30)"] --> UNIT
    PRELOAD["sys-service-loader preload<br>MODE_BACKUP, run_after svc-storage-nfs-server<br>(force_flush_instant + state started)"] --> UNIT
    UNIT["svc-bkp-nfs-2-local.&lt;version&gt;.&lt;domain&gt;.service"] --> LOCK["ExecStartPre: sys-lock against the manipulation group"]
    LOCK --> SCRIPT["ExecStart: script.sh &lt;export_base&gt; &lt;backups_dir&gt;<br>backup-nfs-to-local &lt;state&gt;/backup"]
    SCRIPT -->|export_base missing| ALARM["ERROR exit 1<br>OnFailure alarm"]
    SCRIPT --> RSYNC["rsync -aHAX --delete<br>--exclude /&lt;state&gt;/backup (no backups-in-backups)<br>--link-dest previous generation (hard links)"]
    RSYNC -->|exit 24: live export churn| WARN["WARN, snapshot kept"]
    RSYNC -->|any other failure| CLEAN["generation removed, exit != 0"]
    RSYNC --> TREE["&lt;backups_dir&gt;/&lt;sha256(machine-id)&gt;/<br>backup-nfs-to-local/&lt;YYYYmmddHHMMSS&gt;/files/..."]
    TREE --> PULL["svc-bkp-remote-2-local via ssh<br>user-backup ssh-wrapper: whitelisted ls/rsync per type<br>pulls the newest generation"]

Features

• Differential snapshots: rsync --link-dest against the previous generation deduplicates unchanged files.
• Baudolo-compatible layout: snapshots land in the same <machine-hash>/<repo>/<generation> tree as the container backups, so pull and cleanup tooling applies unchanged.
• Schedule-coordinated: the systemd unit is part of the global manipulation group, so it never races backup/cleanup/repair jobs on the same host.

Quick Setup

Development

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

git clone https://github.com/infinito-nexus/core.git
cd core
make onboard
make compose-deploy mode=reinstall apps=svc-bkp-nfs-2-local full_cycle=false

Production

Install Backup NFS 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-bkp-nfs-2-local
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

Recover

Run files/python/recover.py on the host that serves the NFS export:

recover.py <backups>/<machine-hash>/backup-nfs-to-local/<generation>/files/<state>/<volume> <export-base>/<state>/<volume>

1. Stop every stack consuming the subtree: docker stack rm <stack>.
2. Run the script; it first starts the role's deployed backup unit (a fresh differential backup-nfs-to-local generation of the live export), then mirrors the snapshot into the target (rsync -aHAX --delete, with the shared <state>/backup root protected from deletion and never copied in). --no-safety-backup skips the unit run when the target holds nothing worth saving.
3. Redeploy the stack; the NFS clients re-mount and pick up the restored state.

The target subtree must already exist; the script refuses to create export subtrees implicitly.

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).