mknod Permission denied

bash-4.2$ mknod /var/log/pipe p
mknod: ‘/var/log/pipe’: Permission denied

bash-4.2$ mknod --help
Usage: mknod [OPTION]… NAME TYPE [MAJOR MINOR]
Create the special file NAME of the given TYPE.

Mandatory arguments to long options are mandatory for short options too.
-m, --mode=MODE set file permission bits to MODE, not a=rw - umask
-Z set the SELinux security context to default type
–context[=CTX] like -Z, or if CTX is specified then set the SELinux
or SMACK security context to CTX
–help display this help and exit
–version output version information and exit

Both MAJOR and MINOR must be specified when TYPE is b, c, or u, and they
must be omitted when TYPE is p. If MAJOR or MINOR begins with 0x or 0X,
it is interpreted as hexadecimal; otherwise, if it begins with 0, as octal;
otherwise, as decimal. TYPE may be:

b create a block (buffered) special file
c, u create a character (unbuffered) special file
p create a FIFO

NOTE: your shell may have its own version of mknod, which usually supersedes
the version described here. Please refer to your shell’s documentation
for details about the options it supports.

GNU coreutils online help: http://www.gnu.org/software/coreutils/
Report mknod translation bugs to http://translationproject.org/team/
For complete documentation, run: info coreutils ‘mknod invocation’

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