docs: Improve low diskspace warning (#1158)

Fixes #1152

.github/workflows/build.yml

@@ -28,7 +28,7 @@ jobs:
       -
         name: Docker metadata
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           context: git
           images: |
@@ -43,23 +43,23 @@ jobs:
           DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index
       - 
         name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
       -
         name: Login into Docker Hub
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
       -
         name: Login to GitHub Container Registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       -
         name: Build Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: true

.github/workflows/check.yml

@@ -24,6 +24,6 @@ jobs:
           failure-threshold: warning
       -
         name: Validate JSON and YML files
-        uses: GrantBirki/json-yaml-validate@v4
+        uses: GrantBirki/json-yaml-validate@v5.0.0
         with:
           yaml_exclude_regex: ".*\\kubernetes\\.yml$"

Dockerfile

@@ -14,6 +14,8 @@ FROM debian:trixie-slim
 ARG TARGETARCH
 ARG TARGETPLATFORM
 ARG VERSION_ARG="0.0"
+ARG VERSION_PASST="2026_05_07"
+
 ARG DEBCONF_NOWARNINGS="yes"
 ARG DEBIAN_FRONTEND="noninteractive"
 ARG DEBCONF_NONINTERACTIVE_SEEN="true"
@@ -39,7 +41,7 @@ RUN set -eu && \
         iproute2 \
         dnsmasq \
         fakeroot \
-        apt-utils \        
+        apt-utils \
         net-tools \
         e2fsprogs \
         qemu-utils \
@@ -49,7 +51,7 @@ RUN set -eu && \
         ca-certificates \
         netcat-openbsd \
         qemu-system-x86 && \
-    wget "https://github.com/qemus/passt/releases/download/v2025_09_19/passt_2025_09_19_${TARGETARCH}.deb" -O /tmp/passt.deb -q && \
+    wget "https://github.com/qemus/passt/releases/download/v${VERSION_PASST}/passt_${VERSION_PASST}_${TARGETARCH}.deb" -O /tmp/passt.deb -q --timeout=10 && \
     dpkg -i /tmp/passt.deb && \
     apt-get clean && \
     pip3 install --no-cache-dir --break-system-packages --root-user-action=ignore dissect.cstruct && \

src/disk.sh

@@ -269,12 +269,14 @@ convertDisk() {
   local TMP_FILE="$DISK_BASE.tmp"
   rm -f "$TMP_FILE"
 
+  local DIR
+  DIR=$(dirname "$TMP_FILE")
+
   if [[ "$ALLOCATE" != [Nn]* ]]; then
 
-    local DIR CUR_SIZE SPACE GB
+    local CUR_SIZE SPACE GB
 
     # Check free diskspace
-    DIR=$(dirname "$TMP_FILE")
     CUR_SIZE=$(getSize "$SOURCE_FILE")
     SPACE=$(df --output=avail -B 1 "$DIR" | tail -n 1)
 
@@ -536,16 +538,15 @@ addDisk () {
       GB=$(formatBytes "$FREE")
       LEFT=$(formatBytes "$LEFT")
       CUR_SIZE=$(formatBytes "$CUR_SIZE")
-      msg="the virtual size of the ${DISK_DESC,,} is $CUR_SIZE"
+      msg="The virtual size of the ${DISK_DESC,,} is $CUR_SIZE"
 
-      if [[ "$USED" == "0" ]]; then
-        msg+=","
-      else
+      if [ -n "$USED" ] && [[ "$USED" != "0" ]]; then
         USED=$(formatBytes "$USED")
-        msg+=" (of which $USED is used),"
+        msg+=" (of which $USED is used)"
       fi
 
-      warn "$msg but there is only $GB of free space left in $DIR, make at least $LEFT more room available!"
+      info "$msg, but there is only $GB of free space remaining in $DIR now."
+      info "Please consider making at least $LEFT more space available in $DIR for future expansions."
 
     fi
 
@@ -573,18 +574,25 @@ addDevice () {
   [ ! -b "$DISK_DEV" ] && error "Device $DISK_DEV cannot be found! Please add it to the 'devices' section of your compose file." && exit 55
 
   local sectors=""
-  local result logical physical
-  result=$(fdisk -l "$DISK_DEV" | grep -m 1 -o "(logical/physical): .*" | cut -c 21-)
-  logical="${result%% *}"
-  physical=$(echo "$result" | grep -m 1 -o "/ .*" | cut -c 3-)
-  physical="${physical%% *}"
+  local dev_type=""
+  dev_type=$(lsblk -no TYPE "$DISK_DEV" 2>/dev/null | head -n1)
 
- if [ -n "$physical" ]; then
-    if [[ "$physical" != "512" ]]; then
-      sectors=",logical_block_size=$logical,physical_block_size=$physical"
+  # Only detect and apply sector sizes for partitions, not whole disks
+  # Whole disk passthrough with explicit sector sizes causes DSM not to recognize the disk
+  if [[ "$dev_type" == "part" ]]; then
+    local result logical physical
+    result=$(fdisk -l "$DISK_DEV" | grep -m 1 -o "(logical/physical): .*" | cut -c 21-)
+    logical="${result%% *}"
+    physical=$(echo "$result" | grep -m 1 -o "/ .*" | cut -c 3-)
+    physical="${physical%% *}"
+
+    if [ -n "$physical" ]; then
+      if [[ "$physical" != "512" ]]; then
+        sectors=",logical_block_size=$logical,physical_block_size=$physical"
+      fi
+    else
+      warn "Failed to determine the sector size for $DISK_DEV"
     fi
-  else
-    warn "Failed to determine the sector size for $DISK_DEV"
   fi
 
   DISK_OPTS+=$(createDevice "$DISK_DEV" "$DISK_TYPE" "$DISK_INDEX" "$DISK_ADDRESS" "raw" "$DISK_IO" "$DISK_CACHE" "" "$sectors")
@@ -621,37 +629,8 @@ DISK_OPTS+=$(createDevice "$BOOT" "$DISK_TYPE" "1" "0xa" "raw" "$DISK_IO" "$DISK
 DISK_OPTS+=$(createDevice "$SYSTEM" "$DISK_TYPE" "2" "0xb" "raw" "$DISK_IO" "$DISK_CACHE" "" "")
 
 DISK1_FILE="$STORAGE/${DISK_NAME}"
-if [ ! -f "$DISK1_FILE.img" ] && [ -f "$STORAGE/data${DISK_SIZE}.img" ]; then
-  # Fallback for legacy installs
-  mv "$STORAGE/data${DISK_SIZE}.img" "$DISK1_FILE.img"
-fi
-
 DISK2_FILE="/storage2/${DISK_NAME}2"
-if [ ! -f "$DISK2_FILE.img" ]; then
-  # Fallback for legacy installs
-  FALLBACK="/storage2/data.img"
-  if [[ -f "$DISK1_FILE.img" && -f "$FALLBACK" ]]; then
-    SIZE1=$(stat -c%s "$FALLBACK")
-    SIZE2=$(stat -c%s "$DISK1_FILE.img")
-    if [[ SIZE1 -ne SIZE2 ]]; then
-      mv "$FALLBACK" "$DISK2_FILE.img"
-    fi
-  fi
-fi
-
 DISK3_FILE="/storage3/${DISK_NAME}3"
-if [ ! -f "$DISK3_FILE.img" ]; then
-  # Fallback for legacy installs
-  FALLBACK="/storage3/data.img"
-  if [[ -f "$DISK1_FILE.img" && -f "$FALLBACK" ]]; then
-    SIZE1=$(stat -c%s "$FALLBACK")
-    SIZE2=$(stat -c%s "$DISK1_FILE.img")
-    if [[ SIZE1 -ne SIZE2 ]]; then
-      mv "$FALLBACK" "$DISK3_FILE.img"
-    fi
-  fi
-fi
-
 DISK4_FILE="/storage4/${DISK_NAME}4"
 
 : "${DISK2_SIZE:=""}"

src/memory.sh

@@ -1,14 +1,18 @@
 #!/usr/bin/env bash
 set -Eeuo pipefail
 
+msg="Checking memory..."
+[[ "$DEBUG" == [Yy1]* ]] && echo "$msg"
+
 RAM_AVAIL=$(free -b | grep -m 1 Mem: | awk '{print $7}')
+AVAIL_MEM=$(formatBytes "$RAM_AVAIL")
 
 if [[ "$RAM_CHECK" != [Nn]* && "${RAM_SIZE,,}" != "max" && "${RAM_SIZE,,}" != "half" ]]; then
 
-  AVAIL_MEM=$(formatBytes "$RAM_AVAIL")
+  wanted=$(numfmt --from=iec "$RAM_SIZE")
 
-  if (( (RAM_WANTED + RAM_SPARE) > RAM_AVAIL )); then
-    msg="Your configured RAM_SIZE of ${RAM_SIZE/G/ GB} is too high for the $AVAIL_MEM of memory available,"
+  if (( (wanted + RAM_SPARE) > RAM_AVAIL )); then
+    msg="Your configured RAM_SIZE of ${RAM_SIZE/G/ GB} is too high for the $AVAIL_MEM of free memory available,"
     if [[ "${FS,,}" == "zfs" ]]; then
       info "$msg but since ZFS is active this will be ignored."
     else
@@ -16,8 +20,8 @@ if [[ "$RAM_CHECK" != [Nn]* && "${RAM_SIZE,,}" != "max" && "${RAM_SIZE,,}" != "h
       warn "$msg it will automatically be adjusted to a lower amount."
     fi
   else
-    if (( (RAM_WANTED + (RAM_SPARE * 3)) > RAM_AVAIL )); then
-      msg="your configured RAM_SIZE of ${RAM_SIZE/G/ GB} is very close to the $AVAIL_MEM of memory available,"
+    if (( (wanted + (RAM_SPARE * 3)) > RAM_AVAIL )); then
+      msg="your configured RAM_SIZE of ${RAM_SIZE/G/ GB} is very close to the $AVAIL_MEM of free memory available,"
       if [[ "${FS,,}" == "zfs" ]]; then
         info "$msg but since ZFS is active this will be ignored."
       else
@@ -30,57 +34,45 @@ fi
 
 if [[ "${RAM_SIZE,,}" == "half" ]]; then
 
-  RAM_WANTED=$(( RAM_AVAIL / 2 ))
-  RAM_WANTED=$(( RAM_WANTED / 1073741825 ))
-
-  if (( "$RAM_WANTED" < 1 )); then
-    RAM_WANTED=$(( RAM_AVAIL / 2 ))
-    RAM_WANTED=$(( RAM_WANTED / 1048577 ))
-    RAM_SIZE="${RAM_WANTED}M"
+  if (( (RAM_AVAIL / 2) > RAM_SPARE )); then
+    wanted=$(( (RAM_AVAIL / 2) / 1048577 ))
+    RAM_SIZE="${wanted}M"
+    info "Allocated $wanted MB of RAM for the virtual machine."
   else
-    RAM_SIZE="${RAM_WANTED}G"
+    RAM_SIZE="max"
   fi
 
 fi
 
 if [[ "${RAM_SIZE,,}" == "max" ]]; then
 
-  RAM_WANTED=$(( RAM_AVAIL - (RAM_SPARE * 3) ))
-  RAM_WANTED=$(( RAM_WANTED / 1073741825 ))
+  if (( RAM_AVAIL < (RAM_SPARE * 2) )); then
 
-  if (( "$RAM_WANTED" < 1 )); then
+    wanted=$(( RAM_AVAIL / 2 ))
 
-    RAM_WANTED=$(( RAM_AVAIL - (RAM_SPARE * 2) ))
-    RAM_WANTED=$(( RAM_WANTED / 1073741825 ))
-
-    if (( "$RAM_WANTED" < 1 )); then
-
-      RAM_WANTED=$(( RAM_AVAIL - RAM_SPARE ))
-      RAM_WANTED=$(( RAM_WANTED / 1073741825 ))
-
-      if (( "$RAM_WANTED" < 1 )); then
-
-        RAM_WANTED=$(( RAM_AVAIL - RAM_SPARE ))
-        RAM_WANTED=$(( RAM_WANTED / 1048577 ))
-
-        if (( "$RAM_WANTED" < 1 )); then
-
-          RAM_WANTED=$(( RAM_AVAIL ))
-          RAM_WANTED=$(( RAM_WANTED / 1048577 ))
-
-        fi
-
-        RAM_SIZE="${RAM_WANTED}M"
-      else
-        RAM_SIZE="${RAM_WANTED}G"
-      fi
-    else
-      RAM_SIZE="${RAM_WANTED}G"
-    fi
   else
-    RAM_SIZE="${RAM_WANTED}G"
+
+    wanted=$(( RAM_AVAIL - (RAM_SPARE * 3) ))
+
+    if (( wanted < (RAM_SPARE * 6) )); then
+      wanted=$(( RAM_AVAIL - RAM_SPARE ))
+    fi
+
   fi
 
+  wanted=$(( wanted / 1048577 ))
+  RAM_SIZE="${wanted}M"
+
+  info "Allocated $wanted MB of RAM for the virtual machine."
+
+fi
+
+wanted=$(numfmt --from=iec "$RAM_SIZE")
+
+if [ "$wanted" -lt "$RAM_MINIMUM" ]; then
+  wanted=$(( wanted / 1048577 ))
+  error "Not enough memory available, there is only $wanted MB left!"
+  exit 16
 fi
 
 return 0

src/network.sh

@@ -117,7 +117,7 @@ configureDHCP() {
 
 configureDNS() {
 
-  local if="$1"
+  local fa="$1"
   local ip="$2"
   local mac="$3"
   local host="$4"
@@ -155,9 +155,12 @@ configureDNS() {
   esac
 
   # Set interfaces
-  arguments+=" --interface=$if"
+  arguments+=" --interface=$fa"
   arguments+=" --bind-interfaces"
 
+  # Workaround NET_RAW capability
+  arguments+=" --no-ping"
+
   # Add DNS entry for container
   arguments+=" --address=/host.lan/$gateway"
 
@@ -172,9 +175,11 @@ configureDNS() {
   arguments=$(echo "$arguments" | sed 's/\t/ /g' | tr -s ' ' | sed 's/^ *//')
   [[ "$DEBUG" == [Yy1]* ]] && printf "Dnsmasq arguments:\n\n%s\n\n" "${arguments// -/$'\n-'}"
 
-  if ! $DNSMASQ ${arguments:+ $arguments}; then
+  { $DNSMASQ ${arguments:+ $arguments}; rc=$?; } || :
 
-    local msg="Failed to start Dnsmasq, reason: $?"
+  if (( rc != 0 )); then
+
+    local msg="Failed to start Dnsmasq, reason: $rc"
 
     if [[ "${NETWORK,,}" == "slirp" || "${NETWORK,,}" == "passt" || "$ROOTLESS" != [Yy1]* || "$DEBUG" == [Yy1]* ]]; then
       [ -f "$log" ] && [ -s "$log" ] && cat "$log"
@@ -243,14 +248,13 @@ getUserPorts() {
   done
 
   # Remove duplicates
-  ports=$(echo "${ports//,,/,}," | awk 'BEGIN{RS=ORS=","} !seen[$0]++' | sed 's/,*$//g')
-
-  echo "$ports"
+  echo "${ports//,,/,}," | awk 'BEGIN{RS=ORS=","} !seen[$0]++' | sed 's/,*$//g'
   return 0
 }
 
 getSlirp() {
 
+  local ip="$1"
   local args=""
   local list=""
 
@@ -266,17 +270,15 @@ getSlirp() {
       proto="udp"
       num="${port%/udp}"
     elif [[ "$port" != *"/tcp" ]]; then
-      args+="hostfwd=$proto::$num-$VM_NET_IP:$num,"
+      args+="hostfwd=$proto::$num-$ip:$num,"
       proto="udp"
       num="${port%/udp}"
     fi
 
-    args+="hostfwd=$proto::$num-$VM_NET_IP:$num,"
+    args+="hostfwd=$proto::$num-$ip:$num,"
   done
 
-  args=$(echo "$args" | sed 's/,*$//g')
-
-  echo "${args%?}"
+  echo "$args" | sed 's/,*$//g'
   return 0
 }
 
@@ -297,7 +299,7 @@ configureSlirp() {
   NET_OPTS="-netdev user,id=hostnet0,ipv4=on,host=$gateway,net=${gateway%.*}.0/24,dhcpstart=$ip,${ipv6}hostname=$VM_NET_HOST"
 
   local forward=""
-  forward=$(getSlirp)
+  forward=$(getSlirp "$ip")
   [ -n "$forward" ] && NET_OPTS+=",$forward"
 
   if [[ "${DNSMASQ_DISABLE:-}" == [Yy1]* ]]; then
@@ -351,7 +353,7 @@ configurePasst() {
 
   PASST_OPTS+=" -H $VM_NET_HOST"
   PASST_OPTS+=" -M $GATEWAY_MAC"
-  PASST_OPTS+=" -P  $PASST_PID"
+  PASST_OPTS+=" -P $PASST_PID"
   PASST_OPTS+=" -l $log"
   PASST_OPTS+=" -q"
 
@@ -361,7 +363,10 @@ configurePasst() {
   fi
 
   PASST_OPTS=$(echo "$PASST_OPTS" | sed 's/\t/ /g' | tr -s ' ' | sed 's/^ *//')
-  [[ "$DEBUG" == [Yy1]* ]] && printf "Passt arguments:\n\n%s\n\n" "${PASST_OPTS// -/$'\n-'}"
+
+  if [[ "$DEBUG" == [Yy1]* || "$PASST_DEBUG" == [Yy1]* ]]; then
+    printf "Passt arguments:\n\n%s\n\n" "${PASST_OPTS// -/$'\n-'}"
+  fi
 
   [ ! -f "$PASST" ] && cp /usr/bin/passt* /run
 
@@ -484,7 +489,7 @@ configureNAT() {
     warn "failed to set master bridge!" && return 1
   fi
 
-  if grep -wq "nf_tables" /proc/modules; then
+  if command -v iptables-nft >/dev/null 2>&1 && iptables-nft -V >/dev/null 2>&1; then
     update-alternatives --set iptables /usr/sbin/iptables-nft > /dev/null
     update-alternatives --set ip6tables /usr/sbin/ip6tables-nft > /dev/null
   else
@@ -550,11 +555,11 @@ closeBridge() {
     "user"* | "passt" | "slirp" ) return 0 ;;
   esac
 
-  ip link set "$VM_NET_TAP" down promisc off &> null || true
-  ip link delete "$VM_NET_TAP" &> null || true
+  ip link set "$VM_NET_TAP" down promisc off &> /dev/null || true
+  ip link delete "$VM_NET_TAP" &> /dev/null || true
 
-  ip link set "$VM_NET_BRIDGE" down &> null || true
-  ip link delete "$VM_NET_BRIDGE" &> null || true
+  ip link set "$VM_NET_BRIDGE" down &> /dev/null || true
+  ip link delete "$VM_NET_BRIDGE" &> /dev/null || true
 
   return 0
 }
@@ -614,21 +619,22 @@ cleanUp() {
 
 checkOS() {
 
-  local kernel
   local os=""
-  local if="macvlan"
+  local kernel=""
+  local iface="macvlan"
+
   kernel=$(uname -a)
 
   [[ "${kernel,,}" == *"darwin"* ]] && os="$ENGINE Desktop for macOS"
   [[ "${kernel,,}" == *"microsoft"* ]] && os="$ENGINE Desktop for Windows"
 
   if [[ "$DHCP" == [Yy1]* ]]; then
-    if="macvtap"
+    iface="macvtap"
     [[ "${kernel,,}" == *"synology"* ]] && os="Synology Container Manager"
   fi
 
   if [ -n "$os" ]; then
-    warn "you are using $os which does not support $if, please revert to bridge networking!"
+    warn "you are using $os which does not support $iface, please revert to bridge networking!"
   fi
 
   return 0
@@ -693,6 +699,20 @@ getInfo() {
       exit 29
     fi
 
+    if uname -a | grep -Eqi 'unraid|truenas'; then
+
+      # Check if host exposes the bridge-nf sysctl
+      # (only visible if br_netfilter is loaded and /proc/sys is accessible)
+  
+      BNF="/proc/sys/net/bridge/bridge-nf-call-iptables"
+  
+      if [[ -r "$BNF" ]] && [[ "$(cat "$BNF")" != "0" ]]; then
+        warn "external LAN clients may not be able to reach this container, because net.bridge.bridge-nf-call-iptables=1."
+        warn "you can fix this issue by running 'sysctl -w net.bridge.bridge-nf-call-iptables=0' on the host system."
+      fi
+  
+    fi
+
   else
 
     if [[ "$IP" != "172."* && "$IP" != "10.8"* && "$IP" != "10.9"* ]]; then

src/power.sh

@@ -10,8 +10,6 @@ API_CMD=6
 API_HOST="127.0.0.1:$COM_PORT"
 
 QEMU_TERM=""
-QEMU_DIR="/run/shm"
-QEMU_PID="$QEMU_DIR/qemu.pid"
 QEMU_LOG="$QEMU_DIR/qemu.log"
 QEMU_OUT="$QEMU_DIR/qemu.out"
 QEMU_END="$QEMU_DIR/qemu.end"
@@ -52,7 +50,7 @@ finish() {
       # Workaround for zombie pid
       [ ! -s "$QEMU_PID" ] && break
 
-      if [ "$cnt" == "5" ]; then
+      if [ "$cnt" -eq 5 ]; then
         echo && error "QEMU did not terminate itself, forcefully killing process..."
         { kill -9 "$pid" || true; } 2>/dev/null
       fi

src/proc.sh

@@ -12,7 +12,7 @@ CLOCKSOURCE="tsc"
 CLOCK="/sys/devices/system/clocksource/clocksource0/current_clocksource"
 
 if [ ! -f "$CLOCK" ]; then
-  warn "file \"$CLOCK\" cannot not found?"
+  warn "file \"$CLOCK\" cannot be found?"
 else
   result=$(<"$CLOCK")
   result="${result//[![:print:]]/}"

src/reset.sh

@@ -64,6 +64,7 @@ TEMPLATE="/var/www/index.html"
 FOOTER1="$APP for $ENGINE v$(</run/version)"
 FOOTER2="<a href='$SUPPORT'>$SUPPORT</a>"
 
+SOCKETS=1
 CPU=$(cpu)
 SYS=$(uname -r)
 HOST=$(hostname -s)
@@ -72,31 +73,37 @@ MINOR=$(echo "$SYS" | cut -d '.' -f2)
 ARCH=$(dpkg --print-architecture)
 CORES=$(grep -c '^processor' /proc/cpuinfo)
 
-if ! grep -qi "socket(s)" <<< "$(lscpu)"; then
-  SOCKETS=1
-else
-  SOCKETS=$(lscpu | grep -m 1 -i 'socket(s)' | awk '{print $(2)}')
+if grep -qi "socket(s)" <<< "$(lscpu)"; then
+  SOCKETS=$(lscpu | grep -m 1 -i 'socket(s)' | awk '{print $2}')
+  [ -z "${SOCKETS##*[!0-9]*}" ] && SOCKETS=1
+  [ "$SOCKETS" -lt "1" ] && SOCKETS=1
 fi
 
 CPU_CORES="${CPU_CORES// /}"
+[ -z "$CPU_CORES" ] && CPU_CORES=2
 [[ "${CPU_CORES,,}" == "max" ]] && CPU_CORES="$CORES"
 [[ "${CPU_CORES,,}" == "half" ]] && CPU_CORES=$(( CORES / 2 ))
-[[ "${CPU_CORES,,}" == "0" ]] && CPU_CORES="1"
-[ -n "${CPU_CORES//[0-9 ]}" ] && error "Invalid amount of CPU_CORES: $CPU_CORES" && exit 15
+[ -z "${CPU_CORES##*[!0-9]*}" ] && error "Invalid amount of CPU_CORES: $CPU_CORES" && exit 15
 
+[ "$CPU_CORES" -lt "1" ] && CPU_CORES=1
 if [ "$CPU_CORES" -gt "$CORES" ]; then
-  warn "The amount for CPU_CORES (${CPU_CORES}) exceeds the amount of logical cores available, so will be limited to ${CORES}."
+  warn "The amount for CPU_CORES (${CPU_CORES}) exceeds the amount of logical cores available (${CORES}) and will be limited."
   CPU_CORES="$CORES"
 fi
 
 # Check system
 
+QEMU_DIR="/run/shm"
+
 if [ ! -d "/dev/shm" ]; then
   error "Directory /dev/shm not found!" && exit 14
 else
-  [ ! -d "/run/shm" ] && ln -s /dev/shm /run/shm
+  [ ! -d "$QEMU_DIR" ] && ln -s /dev/shm "$QEMU_DIR"
 fi
 
+QEMU_PID="$QEMU_DIR/qemu.pid"
+rm -f "$QEMU_PID"
+
 # Check folder
 
 if [[ "${STORAGE,,}" != "/storage" ]]; then
@@ -122,12 +129,13 @@ if [[ "${FS,,}" == "ecryptfs" || "${FS,,}" == "tmpfs" ]]; then
 fi
 
 # Read memory
-RAM_SPARE=500000000
 RAM_AVAIL=$(free -b | grep -m 1 Mem: | awk '{print $7}')
 RAM_TOTAL=$(free -b | grep -m 1 Mem: | awk '{print $2}')
 
+RAM_SPARE=500000000
+RAM_MINIMUM=136314880
 RAM_SIZE="${RAM_SIZE// /}"
-[ -z "$RAM_SIZE" ] && error "RAM_SIZE not specified!" && exit 16
+[ -z "$RAM_SIZE" ] && RAM_SIZE="2G"
 
 if [[ "${RAM_SIZE,,}" != "max" && "${RAM_SIZE,,}" != "half" ]]; then
 
@@ -137,8 +145,8 @@ if [[ "${RAM_SIZE,,}" != "max" && "${RAM_SIZE,,}" != "half" ]]; then
 
   RAM_SIZE=$(echo "${RAM_SIZE^^}" | sed 's/MB/M/g;s/GB/G/g;s/TB/T/g')
   ! numfmt --from=iec "$RAM_SIZE" &>/dev/null && error "Invalid RAM_SIZE: $RAM_SIZE" && exit 16
-  RAM_WANTED=$(numfmt --from=iec "$RAM_SIZE")
-  [ "$RAM_WANTED" -lt "136314880 " ] && error "RAM_SIZE is too low: $RAM_SIZE" && exit 16
+  wanted=$(numfmt --from=iec "$RAM_SIZE")
+  [ "$wanted" -lt "$RAM_MINIMUM" ] && error "RAM_SIZE is too low: $RAM_SIZE" && exit 16
 
 fi