linux命名空间UTS 总结

#define _GNU_SOURCE
#include 
#include 
#include 
#include 
#include 
#include 

#define STACK_SIZE (1024*1024)

static char child_stack[STACK_SIZE];
char *const child_args[] = {
"/bin/bash",
NULL
};

int child_main(void *args)
{
        printf("in child process \n");
        sethostname("NewNameSpace", 20);
        execv(child_args[0], child_args);
        return 1;
}

int main()
{
        printf("process start: \n");

        int child_pid = clone(child_main, child_stack + STACK_SIZE, CLONE_NEWUTS|SIGCHLD, NULL);
        waitpid(child_pid, NULL, 0);
        printf("end \n");
        return 0;
}

1、UTS命名空间，提供了主机名和域名的隔离。

运行结果如下：

[root@localhost code]# ./a.out 
process start: 
in child process 
[root@NewNameSpace code]# 
[root@NewNameSpace code]# exit
exit
end 
[root@localhost code]# 

[root@localhost code]# uname -a
Linux NewNameSpace 3.10.0-514.6.1.el7.x86_64 #1 SMP Wed Jan 18 13:06:36 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost code]#