feat: implement zero-downtime Green/Blue deployment using local TCP proxy

deploy_gb.sh

@@ -0,0 +1,96 @@
+#!/bin/bash
+set -e
+
+DEPLOY_HOME="/home/kjh2064"
+PORT_FILE="$DEPLOY_HOME/taxbaik_port"
+TIMESTAMP=$(date +%Y%m%d_%H%M%S)
+
+echo "===== 🚀 TaxBaik Green/Blue Deployment Script ====="
+
+# 1. Determine active port
+ACTIVE_PORT=5003
+if [ -f "$PORT_FILE" ]; then
+  ACTIVE_PORT=$(cat "$PORT_FILE" | tr -d '[:space:]')
+fi
+
+# 2. Determine target port
+TARGET_PORT=5003
+if [ "$ACTIVE_PORT" -eq 5003 ]; then
+  TARGET_PORT=5004
+else
+  TARGET_PORT=5003
+fi
+
+echo "Active Port: $ACTIVE_PORT"
+echo "Target Port: $TARGET_PORT"
+
+# 3. New deploy dir is passed as first argument
+DEPLOY_DIR="$1"
+if [ -z "$DEPLOY_DIR" ]; then
+  echo "Error: Deployment directory argument required"
+  exit 1
+fi
+
+echo "Deploy Directory: $DEPLOY_DIR"
+
+# 4. Start the new app on the target port
+echo "=== Starting New App on Port $TARGET_PORT ==="
+cd "$DEPLOY_DIR"
+export ASPNETCORE_ENVIRONMENT=Production
+export ASPNETCORE_URLS="http://127.0.0.1:$TARGET_PORT"
+
+# Run dotnet process
+nohup /usr/bin/dotnet TaxBaik.Web.dll > "web_${TARGET_PORT}.log" 2>&1 &
+NEW_PID=$!
+sleep 2
+
+# Verify process is running
+if ! ps -p $NEW_PID > /dev/null; then
+  echo "❌ Failed to start dotnet process on port $TARGET_PORT"
+  exit 1
+fi
+
+# 5. Health Check Loop
+echo "=== Health Checking Port $TARGET_PORT ==="
+ATTEMPTS=20
+SUCCESS=false
+for i in $(seq 1 $ATTEMPTS); do
+  STATUS=$(curl -sf -o /dev/null -w '%{http_code}' "http://127.0.0.1:${TARGET_PORT}/taxbaik/healthz" 2>/dev/null || echo "000")
+  if [ "$STATUS" = "200" ]; then
+    echo "✓ Health check passed on port $TARGET_PORT (Attempt $i/$ATTEMPTS)"
+    SUCCESS=true
+    break
+  fi
+  echo "  Waiting for health check... ($i/$ATTEMPTS, Status: $STATUS)"
+  sleep 2
+done
+
+if [ "$SUCCESS" = "false" ]; then
+  echo "❌ Health check failed. Rolling back..."
+  kill -9 $NEW_PID || true
+  exit 1
+fi
+
+# 6. Switch Traffic
+echo "=== Switching Traffic to Port $TARGET_PORT ==="
+echo "$TARGET_PORT" > "$PORT_FILE"
+echo "✓ Traffic routed to $TARGET_PORT"
+
+# 7. Terminate Old App
+echo "=== Stopping Old App on Port $ACTIVE_PORT ==="
+# Find PID listening on ACTIVE_PORT
+OLD_PID=$(ss -tlnp | grep ":$ACTIVE_PORT " | grep -oP 'pid=\K\d+' | head -n1)
+if [ -n "$OLD_PID" ]; then
+  echo "Killing old process PID: $OLD_PID"
+  kill -15 $OLD_PID || kill -9 $OLD_PID
+  echo "✓ Old process terminated"
+else
+  echo "No old process found on port $ACTIVE_PORT"
+fi
+
+# 8. Cleanup old deployment directories (Keep last 5)
+echo "=== Cleaning Up Old Deployments ==="
+ls -1dt $DEPLOY_HOME/deployments/taxbaik_* 2>/dev/null | tail -n +6 | xargs rm -rf 2>/dev/null || true
+echo "✓ Cleanup completed"
+
+echo "===== ✅ Green/Blue Deployment Completed Successfully ====="