docker-images - docker官方拉取的centos最新镜像系统信息却是ubuntu怎么回事啊？

Question

我拉取的官方centos:latest镜像，运行后运行uname -a没看到centos字样，只有ubuntu，怎么回事啊？

Answer 1

The kernel of the container is the kernel of the host, and your host is ubuntu

Answer 2

After some research, it seems that the docker kernel is indeed the host kernel

• The difference between distributions mainly lies in the organizational form such as file directories and the difference in pre-installed software

• The docker image is just a packaged file system and does not include the system kernel

#查看系统的发行说明
cat /etc/issue

#uname是直接调用系统接口得到信息, shell的uname命令实际封装了函数

#include <sys/utsname.h>
int uname(struct utsname *name);

In this case, it shouldn’t be a problem to see two differences.