Some reliable web app patterns for resilient cloud-based web application include:

1. Implementing auto-scaling to handle fluctuating traffic.
2. Using multiple availability zones to ensure high availability and fault tolerance.
3. Using a distributed caching layer to reduce database load and improve performance.
4. Implementing a content delivery network (CDN) to improve website performance and availability.
5. Implementing continuous integration and delivery (CI/CD) for automated testing, deployment, and rollback.
6. Implement a disaster recovery plan to ensure business continuity in a major outage.
7. Using a load balancer to distribute traffic across multiple servers for improved performance and availability.
8. Implementing a monitoring and logging system to identify and resolve issues proactively.
9. Implementing security measures such as SSL/TLS encryption, firewalls, and access controls to protect against attacks.
10. Designing for scalability and resiliency from the start rather than as an afterthought.