PM2 Deployment Script

bash Copy Code

#!/bin/bash
# PM2 Zero-Downtime Deployment Script
set -euo pipefail

APP_NAME="${1:-myapp}"
APP_DIR="${2:-/var/www/$APP_NAME}"
BRANCH="${3:-main}"
LOG_FILE="/var/log/deploy-${APP_NAME}.log"

log() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1" | tee -a "$LOG_FILE"; }

log "=== Starting deployment of $APP_NAME ==="

cd "$APP_DIR"

# Save current commit for rollback
PREV_COMMIT=$(git rev-parse HEAD)
log "Current commit: $PREV_COMMIT"

# Pull latest changes
log "Pulling from $BRANCH..."
git fetch origin "$BRANCH"
git reset --hard "origin/$BRANCH"

NEW_COMMIT=$(git rev-parse HEAD)
log "New commit: $NEW_COMMIT"

if [ "$PREV_COMMIT" = "$NEW_COMMIT" ]; then
    log "No changes detected. Skipping deployment."
    exit 0
fi

# Install dependencies
log "Installing dependencies..."
npm ci --production

# Run migrations if script exists
if [ -f "scripts/migrate.js" ]; then
    log "Running migrations..."
    node scripts/migrate.js
fi

# Reload with zero downtime
log "Reloading PM2 processes..."
pm2 reload "$APP_NAME" --update-env

# Health check
sleep 5
if pm2 show "$APP_NAME" | grep -q "online"; then
    log "Deployment successful! App is online."
else
    log "ERROR: App not healthy after deploy. Rolling back..."
    git reset --hard "$PREV_COMMIT"
    npm ci --production
    pm2 reload "$APP_NAME" --update-env
    log "Rolled back to $PREV_COMMIT"
    exit 1
fi

log "=== Deployment complete ==="

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