create docker-network script

docker-network.sh

@@ -0,0 +1,92 @@
+#!/bin/bash
+set -euo pipefail
+
+DOCKER_CONFIG="/etc/docker/daemon.json"
+JQ=$(command -v jq || true)
+
+if [[ -z "$JQ" ]]; then
+  echo "❌ jq is required but not installed."
+  exit 1
+fi
+
+# Step 1: Check if default-address-pools exists and extract current second octet
+DEFAULT_OCTET=""
+if [[ -f "$DOCKER_CONFIG" ]] && grep -q '"default-address-pools"' "$DOCKER_CONFIG"; then
+  BASE=$(jq -r '.["default-address-pools"][0].base' "$DOCKER_CONFIG")
+  if [[ "$BASE" =~ ^10\.([0-9]+)\. ]]; then
+    DEFAULT_OCTET="${BASH_REMATCH[1]}"
+    echo "Found existing default-address-pools base: $BASE"
+  fi
+fi
+
+# Step 2: Ask for second octet (suggest default if available)
+USE_EXISTING_CONFIG=false
+
+if [[ -n "$DEFAULT_OCTET" ]]; then
+  read -rp "Use existing second octet ($DEFAULT_OCTET)? [Y/n]: " confirm
+  confirm=${confirm:-Y}
+  if [[ "$confirm" =~ ^[Nn]$ ]]; then
+    read -rp "Enter new second octet (e.g. 102): " OCTET
+  else
+    OCTET="$DEFAULT_OCTET"
+    USE_EXISTING_CONFIG=true
+  fi
+else
+  read -rp "Enter second octet for Docker address pool (e.g. 102): " OCTET
+fi
+
+# Validate input
+if ! [[ "$OCTET" =~ ^[0-9]+$ ]] || ((OCTET < 1 || OCTET > 254)); then
+  echo "❌ Invalid octet: $OCTET"
+  exit 1
+fi
+
+# Step 3: Write daemon.json (overwrite or create) only if needed
+if [[ "$USE_EXISTING_CONFIG" == false ]]; then
+  echo "Writing Docker daemon config with base: 10.${OCTET}.0.0/16"
+  sudo mkdir -p /etc/docker
+  cat <<EOF | sudo tee "$DOCKER_CONFIG" > /dev/null
+{
+    "default-address-pools": [
+        {
+            "base": "10.${OCTET}.0.0/16",
+            "size": 24
+        }
+    ]
+}
+EOF
+
+  echo "Restarting Docker..."
+  sudo systemctl restart docker
+else
+  echo "🟡 Skipping daemon config update and Docker restart (using existing settings)"
+fi
+
+# Step 4: Create standard networks
+declare -A networks
+networks[internet]="10.${OCTET}.100.0/24"
+networks[pangolin_transport]="10.${OCTET}.200.0/24"
+
+for name in "${!networks[@]}"; do
+  subnet="${networks[$name]}"
+  if docker network inspect "$name" >/dev/null 2>&1; then
+    echo "✅ Network '$name' already exists."
+  else
+    echo "Creating network '$name' with subnet $subnet"
+
+    if [[ "$name" == "internet" ]]; then
+      docker network create \
+        --driver=bridge \
+        --subnet="$subnet" \
+        "$name"
+    else
+      docker network create \
+        --driver=bridge \
+        --subnet="$subnet" \
+        --internal \
+        "$name"
+    fi
+  fi
+done
+
+echo "✅ Done. Docker daemon configured and standard networks created."