hotfix: db ec2에 OOM 방지를 위한 swap 메모리 추가 (#59)

Author: Hexeong

modules/app_stack/scripts/mysql_setup.sh.tftpl

@@ -18,8 +18,32 @@ command -v docker >/dev/null
 command -v blkid >/dev/null
 command -v mkfs.ext4 >/dev/null
 command -v mountpoint >/dev/null
+command -v swapon >/dev/null
+command -v mkswap >/dev/null
+
+ensure_swap() {
+  local swap_file="/swapfile"
+
+  if ! swapon --show=NAME --noheadings | grep -Fxq "$swap_file"; then
+    if [ ! -f "$swap_file" ]; then
+      fallocate -l 2G "$swap_file" || dd if=/dev/zero of="$swap_file" bs=1M count=2048
+    fi
+
+    chmod 600 "$swap_file"
+    if [ "$(blkid -s TYPE -o value "$swap_file" 2>/dev/null || true)" != "swap" ]; then
+      mkswap "$swap_file"
+    fi
+
+    swapon "$swap_file"
+  fi
+
+  if ! grep -Eq "^[^#][[:space:]]*$swap_file[[:space:]]+none[[:space:]]+swap[[:space:]]" /etc/fstab; then
+    printf '%s none swap sw 0 0\n' "$swap_file" >> /etc/fstab
+  fi
+}
 
 systemctl enable docker
+ensure_swap
 
 DATA_VOLUME_ID="${db_data_volume_id}"
 DATA_VOLUME_SERIAL="$(printf '%s' "$DATA_VOLUME_ID" | tr -d '-')"