Sync backup.conf/README to a spare box; make DR bring-up fault-tolerant
- dr_bringup.sh: bound every kopia call and docker compose up with a timeout so one stuck service can't stall the rest of the batch, and only exit non-zero if literally nothing came up — a partial recovery is a partial success, not a failed run. - backup_kopia.sh: optional DR_SYNC_HOST/DR_SYNC_PATH in backup.conf scp's backup.conf + README.md to a spare box over SSH after every successful backup, so dr_bringup.sh is ready there with no manual copy step. - backup.sh: prompts for the spare's SSH destination, verifies connectivity at install time instead of failing silently at 2am, and writes ~/docker/backup/README.md (this service never had one) so the synced copy documents every command listed above. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NQkdAn3iG5A4WoqU9FHMaN
This commit is contained in:
Claude
+151
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@@ -452,6 +452,40 @@ install_backup() {
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if [ -n "$NTFY_URL" ]; then
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prompt_text " ntfy access token (blank if public/no auth):" "" NTFY_TOKEN
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fi
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# ── Disaster-recovery spare box (optional) ────────────────────────────────
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echo ""
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echo "═══════════════════════════════════════════════════════"
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echo " DISASTER-RECOVERY SPARE (optional)"
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echo "═══════════════════════════════════════════════════════"
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echo ""
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echo " If you keep a spare box ready to take over on failure (running"
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echo " dr_bringup.sh), this can push backup.conf + README.md to it after"
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echo " every successful backup, so it's always ready without a manual copy."
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echo ""
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echo " Requires passwordless SSH (key-based) from THIS box to the spare,"
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echo " as the account below. Since the backup timer runs as root, that"
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echo " usually means a key in /root/.ssh authorized on the spare — set that"
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echo " up first if you haven't (ssh-keygen, then ssh-copy-id to the spare)."
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echo ""
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local DR_SYNC_HOST="" DR_SYNC_PATH=""
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prompt_text " Spare box SSH destination, user@host (blank to skip):" "" DR_SYNC_HOST
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if [ -n "$DR_SYNC_HOST" ]; then
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prompt_text " Path for backup.conf/README on the spare:" "~/docker/backup" DR_SYNC_PATH
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DR_SYNC_PATH="${DR_SYNC_PATH:-~/docker/backup}"
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# Catch a missing/unauthorized key now, not at 2am during the first
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# scheduled backup. Non-fatal either way — the setting is saved
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# regardless, since the key may simply not be set up yet.
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if ssh -o BatchMode=yes -o ConnectTimeout=5 "$DR_SYNC_HOST" true 2>/dev/null; then
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log_success " SSH to $DR_SYNC_HOST works — spare sync will run after each backup."
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else
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log_warning " Couldn't SSH to $DR_SYNC_HOST without a password right now."
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log_warning " Spare sync is saved but will fail until this works (as root, since"
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log_warning " the backup timer runs as root): ssh-keygen; ssh-copy-id $DR_SYNC_HOST"
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fi
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fi
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mkdir -p "$DIR"
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ensure_docker_dir_ownership "$DIR"
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@@ -531,6 +565,14 @@ install_backup() {
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echo "# Leave blank to disable. NTFY_TOKEN is optional (for private topics)."
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printf "NTFY_URL='%s'\n" "${NTFY_URL:-}"
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printf "NTFY_TOKEN='%s'\n" "${NTFY_TOKEN:-}"
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echo ""
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echo "# ── Disaster-recovery spare sync ───────────────────────────────────────────"
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echo "# If set, backup_kopia.sh scp's this backup.conf + README.md to"
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echo "# DR_SYNC_HOST:DR_SYNC_PATH after every successful backup, so a spare box"
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echo "# running dr_bringup.sh is always ready with no manual copy step. Requires"
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echo "# passwordless SSH from this box to the spare (see README.md)."
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printf "DR_SYNC_HOST='%s'\n" "${DR_SYNC_HOST:-}"
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printf "DR_SYNC_PATH='%s'\n" "${DR_SYNC_PATH:-~/docker/backup}"
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} > "$CONF_FILE"
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chown root:root "$CONF_FILE" 2>/dev/null || true
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chmod 600 "$CONF_FILE"
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@@ -676,6 +718,106 @@ SVCEOF
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AUTORUN="cat /etc/cron.d/${SVC_NAME}"
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fi
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# ── Write README ─────────────────────────────────────────────────────────
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# Written before the optional first run below so, if DR sync is enabled,
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# the very first backup already ships an up-to-date README to the spare.
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local DEST_LIST_MD=""
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for dn in "${DEST_NAMES_ARR[@]}"; do
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DEST_LIST_MD+="- **${dn}**: ${DEST_REPOS[$dn]}"$'\n'
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done
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local DR_SYNC_MD OFFSITE_MD
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if [ -n "${DR_SYNC_HOST:-}" ]; then
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DR_SYNC_MD="Configured: after every successful backup, this box copies backup.conf + this README to \`${DR_SYNC_HOST}:${DR_SYNC_PATH:-~/docker/backup}\` over SSH."
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else
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DR_SYNC_MD="Not configured. Re-run this installer to set it up, or copy backup.conf to the spare manually whenever it changes."
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fi
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if [ "${REMOTE_TYPE:-none}" != "none" ]; then
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OFFSITE_MD="Configured: every backup also runs \`kopia repository sync-to ${REMOTE_TYPE}\` to mirror the repo off this box."
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else
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OFFSITE_MD="Not configured. Set REMOTE_TYPE/REMOTE_ARGS in backup.conf (see the comment above them) to mirror the repo off this box."
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fi
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write_readme "$DIR" << MD
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# Backup — Kopia
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Full recovery for every Docker service under \`$DOCKER_DIR\`: each service's
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entire directory (compose file, \`.env\`, config, data, databases) is
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snapshotted with Kopia — deduplicated, compressed (zstd), and encrypted.
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Databases are captured consistently (container stopped briefly, snapshotted,
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restarted); Minecraft instead gets a live save-all flush, no downtime.
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## Destinations
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$DEST_LIST_MD
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## Schedule
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$SCHED_LABEL — keeps the latest $KEEP_LATEST snapshots (plus 7 daily / 4
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weekly / 3 monthly).
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## Commands
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\`\`\`bash
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sudo $WORKER # back up now
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sudo $WORKER snapshots # list all snapshots
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sudo $WORKER policy # show retention policy
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\`\`\`
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### Restore — interactive, one service at a time
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\`\`\`bash
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sudo $RESTORE
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sudo $RESTORE --list
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\`\`\`
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### Disaster recovery — unattended, every service, for a cold spare box
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\`\`\`bash
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sudo $DR_BRINGUP # restore + start everything
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sudo $DR_BRINGUP --list # list what's restorable
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sudo $DR_BRINGUP --dry-run # preview, touch nothing
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sudo $DR_BRINGUP --service NAME # just one service
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\`\`\`
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A single service failing to restore or start does not stop the rest of the
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batch — it's logged and skipped so the run maximizes what actually comes
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back up. The exit code is only non-zero if nothing came up at all.
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**On the spare box**, \`dr_bringup.sh\` needs \`backup.conf\` from this
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directory to connect to the repo — see the DR spare sync section below.
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## Disaster-recovery spare sync
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$DR_SYNC_MD
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Requires passwordless SSH (key-based) from this box to the spare — since the
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backup timer runs as root, generate/authorize a key for root:
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\`ssh-keygen\`, then \`ssh-copy-id\` to the spare.
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## Offsite mirror
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$OFFSITE_MD
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## Backup test — stop / restore / compare / restore-back
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\`\`\`bash
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sudo $TEST_SCRIPT # test most recent backup, all services
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sudo $TEST_SCRIPT --list # list testable services
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sudo $TEST_SCRIPT --service NAME
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\`\`\`
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## Files
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- \`backup.conf\` — destinations, passwords, retention, DR-sync/offsite settings (chmod 600)
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- \`backup_kopia.sh\` — the worker the systemd timer runs
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- \`restore_kopia.sh\` — interactive restore
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- \`dr_bringup.sh\` — unattended full-stack restore + start
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- \`test_backup_kopia.sh\` / \`test_backup.sh\` — automated restore tests
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**Save the passwords in \`backup.conf\` somewhere safe** — without them the
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encrypted repos cannot be restored.
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MD
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# ── 12. Optional first run ────────────────────────────────────────────────
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echo ""
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local _now=""
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@@ -717,8 +859,15 @@ SVCEOF
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echo " sudo $DR_BRINGUP restore + start everything"
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echo " sudo $DR_BRINGUP --list list what's restorable"
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echo " sudo $DR_BRINGUP --dry-run preview, touch nothing"
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echo " Copy backup.conf to the spare box first — it holds the repo path(s)"
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echo " and password(s) this needs to connect."
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if [ -n "${DR_SYNC_HOST:-}" ]; then
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echo " backup.conf + README.md sync to $DR_SYNC_HOST after every backup — the"
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echo " spare stays ready with no manual copy step."
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else
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echo " Copy backup.conf to the spare box first — it holds the repo path(s)"
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echo " and password(s) this needs to connect."
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fi
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echo ""
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echo " Full docs: $DIR/README.md"
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echo ""
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echo " Backup test (stop/restore/compare/restore-back):"
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echo " sudo $TEST_SCRIPT test most recent backup (all services)"
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