Tested your cloud application for resilience yet?

Importance of application resiliency to completely leverage the high availability of cloud 

Two-thirds of organizations are opting to use cloud technology as they struggle to derive anticipated benefits. Post-migration performance problems frequently clog systems and applications which aren’t remediated and checked before migration. Therefore, hiring cloud application services can come to the rescue, which will look at a typical failure in applications in-depth and identify what causes it and how to prevent it. 

Expecting higher cloud availability Azure-Site-Recovery-COMPLIANCE-TESTING.jpg

Another prominent advantage of cloud migration is the high availability, which is described as the system’s capacity to keep providing uninterrupted services in all circumstances. This is done by cloud consulting companies with continuous monitoring, load balancing, failure monitoring, and automated failover to any secondary portion when the primary one happens at the OSI layer. 

Not ignoring the Application Resilience for Cloud Application 

When consumers switch from an on-premises environment to the cloud, they expect high availability. This is because cloud managed services companies ensure availability targets based on the service level a customer has subscribed to. However, the statement is false. The cloud provider guarantees the underlying infrastructure by various techniques, but the tenant is responsible for developing their resiliency application. Applications not processed promptly can eventually adversely affect system availability. 

But then enterprises need to need to first know more about application resiliency. The definition of application resiliency can be described merely as the ‘ability to provide and sustain appropriate service levels in the face of various faults and challenges to regular operation. Robust cloud applications can react effectively to unplanned disruptive incidences.  

It helps to manage fault recovery and graceful deterioration in severe circumstances. 

In some of the migration strategies followed by the cloud consulting companies, they attempt to migrate the application layer resulted in failures to localize or secure the resiliency, creating an application vulnerability. Even in cloud applications that are natively built, there are best practices to follow for resiliency to realize cloud computing’s full potential. 

Many reports suggest widespread service failure with the music streaming business due to a cascading failure of multiple microservices caused by a transient network issue. Many devices are not architected and tested for handling a transient loss, which eventually results in cascading failures gradually pushes towards a cohesive recovery. 

Implementing Mission-Critical Resiliency testing by negating conventional testing  

Testing, assessing, and characterizing cloud application resiliency are vital tasks that go hand in hand with the cloud application that ensures a high range of device availability. Testing methods like testbeds are not suitable for detecting cloud application resiliency issues due to the following reasons: 

  • Current tests are business use cases or requirements-driven. They don’t detect underlying faults. 
  • Heterogeneous multi-layer architecture is difficult to manage due to the complexities of interactions between different software entities. 
  • Weak determinism in device behavior due to cloud architecture. 
  • A plethora of errors that are latent or symptomatic before a particular roadblock makes them noticeable. 
  • There may be separate layers for various stakeholders in a cloud service that are operated by different staff. 

Significant ways to evaluate and test the cloud app resilience 

Cloud-Computing-Expert-Desired-Configuration.jpgThe cloud managing application resiliency is more critical because distributed systems are more vulnerable to failure. This can cause cloud applications to fail in unexpected ways, even if the cloud provider’s underlying architecture is robust.  

Cloud Quality Engineers should employ the following techniques to determine and fix application layer resilience: 

  • It becomes necessary to collaborate with cloud architects to evaluate applications’ availability criteria and establish the required durability ratings. 
  • Most cloud consulting companies can hypothesize failure modes in advance and prioritize the failure modes that significantly affect the business. 
  • Inject known defects into the programs to cause device crashes during testing phases. We call this the “fault kitchen” where recipes, including failover situations such as unreasonable delay in response, resource-hogging, network outages, transient conditions, and drastic behavior by users, can be found. 
  • Penetrating faults in varying magnitude and combination and track the actions of the application layer. 

Many cloud-managed services companies that begin with creating a behavior profile continue to experiment and iterate to validate criticality. 

By following an architecture-driven testing approach, application resiliency can be tracked during the development lifecycle, providing ample time for performance remediation activities. 

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