结合What is the relationship between the docker host OS and the container base image OS?、How can Docker run distros with different kernels?和[Why docker has ability to run different linux distribution?(https://stackoverflow.com/questions/25444099/why-docker-has-ability-to-run-different-linux-distribution)这几篇文章看来，Docker实例和Host OS之间通讯的唯一桥梁就是Host OS的内核。挡在Fedora上跑一个Ubuntu 16.04的Docker实例时，Docker实例用的内核仍然是Fedora的内核，而不是Ubuntu 16.04所对应的的内核，因此有可能和原生的Ubuntu 16.04有一些内核上的区别。
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