In the new world of distributed and decoupled application, deployed in cloud or hybrid. It is very important to improve resiliency and performance with controlled experiments. Using cloud tools to perform chaos or fault injection testing can help, DevOps teams to more quickly identify and resolve issues that might not be captured with other testing. Since such testing is less taxing hence can be iterated on high frequency, to protect from unplanned downtime and outages are far less likely to occur due to proactive and constant testing. This testing relies on the proactive identification of errors within a system in order to prevent outages and negative impacts on the user.In this talk I will shared how different cloud vendors provide solution for such test.