The 2nd International Workshop on Software-Defined Networking and Network Function Virtualization for Flexible Network Management (SDNFlex 2017) will be held in Göttingen, Germany in conjunction with NetSys 2017, which is technically co-sponsored by IEEE Communications Society (IEEE ComSoc), Information Technology Society within VDE (ITG VDE), the German Informatics Society (GI) and in-cooperation with ACM SIGCOMM. The workshop is supported by the RWTH Aachen, the University of Würzburg, the Technical University of Darmstadt and the EUREKA / Celtic-Plus cluster project SENDATE. It is further endorsed by the ITG section 5.2.1 (System Architecture and Traffic Engineering), the ITG section 5.2.2 (Network Security) and the ITG section 5.2.4. (IP and Mobility).