setns调用可以用来加入现有进程的namespace

函数原型

#define _GNU_SOURCE             /* See feature_test_macros(7) */
#include <sched.h>

 int setns(int fd, int nstype);

用例

参考​​https://github.com/chengxiangwang/enoc.git​​

$make
$sudo ./main run
main: cloned container pid:14918

# 再开一个terminal tab
$sudo ./main exec 14918
$ps
  PID TTY          TIME CMD
   11 pts/4    00:00:00 bash
   19 pts/4    00:00:00 ps

$hostname
container_001