Ok, Everybody knows it, microservice is great. I am confident on this too, for 5 years the all Clever Cloud architecture is based on it. But, as all the new trendy buzzword, it’s not a silver bullet, and there is several problems to manage. One is the authentication, distributed authentication is hard, and there is many ways to achieve it. Configuration is the second issue to be managed when dealing with distributed micro application strategy. This talk is a concrete return of experience to build a strategy on microservice and problems we will have to deal on this occasion.