005/006: mount /dev/sdb at /var/lib/postgresql + install PostgreSQL 17 on it

2026-08-31 16:11:37 +09:00
parent 9284569222
commit 873d254009
3 changed files with 84 additions and 1 deletions
@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+# 005-mount-pgdata - Mount the dedicated 20G data disk (/dev/sdb, ext4)
+# at /var/lib/postgresql so the PostgreSQL cluster lives on its own disk.
+# Mounted by UUID (stable across device reordering), noatime for DB workload.
+# up:   fstab entry + mount (idempotent; refuses if mountpoint holds data)
+# down: unmount + remove fstab entry (data on the disk is preserved)
+set -euo pipefail
+
+DISK_UUID=d44ad362-947a-46de-acbf-5530f83e4506
+MOUNTPOINT=/var/lib/postgresql
+FSTAB_LINE="UUID=$DISK_UUID $MOUNTPOINT ext4 defaults,noatime 0 2"
+
+case "${1:-}" in
+  up)
+    if findmnt -rn "$MOUNTPOINT" >/dev/null; then
+      echo "    $MOUNTPOINT already mounted - skipping"
+      exit 0
+    fi
+    dev=$(findfs UUID="$DISK_UUID") || {
+      echo "disk with UUID=$DISK_UUID not found - is /dev/sdb attached?" >&2
+      exit 1
+    }
+    # Never mount over existing data - it would be silently hidden
+    if [[ -d $MOUNTPOINT ]] && find "$MOUNTPOINT" -mindepth 1 -print -quit | grep -q .; then
+      echo "refusing to mount: $MOUNTPOINT exists and is not empty" >&2
+      exit 1
+    fi
+    mkdir -p "$MOUNTPOINT"
+    grep -q "^UUID=$DISK_UUID" /etc/fstab || echo "$FSTAB_LINE" >> /etc/fstab
+    mount "$MOUNTPOINT"   # via fstab entry - also validates it
+    echo "    $dev mounted at $MOUNTPOINT (noatime, fstab entry added)"
+    ;;
+  down)
+    # sysmig rolls back in reverse order, so 006 (postgres) is already down
+    if findmnt -rn "$MOUNTPOINT" >/dev/null; then umount "$MOUNTPOINT"; fi
+    sed -i "\|^UUID=$DISK_UUID|d" /etc/fstab
+    rmdir "$MOUNTPOINT" 2>/dev/null || true   # keep dir if data remains
+    echo "    $MOUNTPOINT unmounted + fstab entry removed (disk data kept)"
+    ;;
+esac