GNU bug report logs - #12023
bug of hostid cmd ?

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: "�e�nQQ��" <55079536 <at> qq.com>
To: "bug-coreutils" <bug-coreutils <at> gnu.org>
Subject: bug of hostid cmd ?
Date: Sun, 22 Jul 2012 11:44:48 +0800

[Message part 1 (text/plain, inline)]

HI, guy,

Can you tell me how the "hostid" command work? or how can I control my "hostid"?

Why my output from "hostid " switch around "0a799228", "0a799a28", "0a799328" randomly?

Here are lists of my "hostid" information, if any other information needed, please just mail me directly.

Hope to get you reply soon, thanks.

[lin <at> centos ~]$ hostid
0a799228
[lin <at> centos ~]$ hostid
0a799a28
[lin <at> centos ~]$ hostid
0a799328
[lin <at> centos ~]$ rpm -q coreutils
coreutils-8.4-19.el6.i686
[lin <at> centos ~]$ rpm -q centos-release
centos-release-6-3.el6.centos.9.i686
[lin <at> centos ~]$ which hostid
/usr/bin/hostid
[lin <at> centos ~]$ ldd /usr/bin/hostid 
    linux-gate.so.1 =>  (0x00dc0000)
    libc.so.6 => /lib/libc.so.6 (0x00902000)
    /lib/ld-linux.so.2 (0x008dc000)
[lin <at> centos ~]$

[Message part 2 (text/html, inline)]

Message #10 received at 12023-done <at> debbugs.gnu.org (full text, mbox):

From: P��draig Brady <P <at> draigBrady.com>
To: � <55079536 <at> qq.com>
Cc: 12023-done <at> debbugs.gnu.org
Subject: Re: bug#12023: bug of hostid cmd ?
Date: Sun, 22 Jul 2012 13:04:47 +0100

On 07/22/2012 04:44 AM, � wrote:
> HI, guy,
> 
> Can you tell me how the "hostid" command work? or how can I control my "hostid"?
> 
> Why my output from "hostid " switch around "0a799228", "0a799a28", "0a799328" randomly?
> 
> Here are lists of my "hostid" information, if any other information needed, please just mail me directly.
> 
> Hope to get you reply soon, thanks.
> 
> [lin <at> centos ~]$ hostid
> 0a799228
> [lin <at> centos ~]$ hostid
> 0a799a28
> [lin <at> centos ~]$ hostid
> 0a799328
> [lin <at> centos ~]$ rpm -q coreutils
> coreutils-8.4-19.el6.i686
> [lin <at> centos ~]$ rpm -q centos-release
> centos-release-6-3.el6.centos.9.i686
> [lin <at> centos ~]$ which hostid
> /usr/bin/hostid
> [lin <at> centos ~]$ ldd /usr/bin/hostid 
>     linux-gate.so.1 =>  (0x00dc0000)
>     libc.so.6 => /lib/libc.so.6 (0x00902000)
>     /lib/ld-linux.so.2 (0x008dc000)
> [lin <at> centos ~]$

hostid(1) is a thin wrapper around gethostid(3).
From that man page we have:

In  the  glibc implementation, if gethostid() cannot open the file con�\
taining the host ID [/etc/hostid], then it obtains the hostname using gethostname(2),
passes  that  hostname  to  gethostbyname_r(3)  in  order to obtain the
host's IPv4 address, and returns a value obtained by bit-twiddling  the
IPv4 address.  (This value may not be unique.)

So I installed the following to reference that man page.

thanks,
P��draig.

commit f93d5985a2bc468f9f92f3bb8dedb0d3bf0807d8
Author: P��draig Brady <P <at> draigBrady.com>
Date:   Sun Jul 22 12:59:49 2012 +0100

    doc: mention gethostid(3) in hostid(1)

    * man/hostid.x: Add gethostid(3) to SEE ALSO section.
    Addresses http://bugs.gnu.org/12023

diff --git a/man/hostid.x b/man/hostid.x
index 1bba0a6..767a3e2 100644
--- a/man/hostid.x
+++ b/man/hostid.x
@@ -2,3 +2,5 @@
 hostid \- print the numeric identifier for the current host
 [DESCRIPTION]
 .\" Add any additional description here
+[SEE ALSO]
+gethostid(3)

Message #13 received at 12023 <at> debbugs.gnu.org (full text, mbox):

From: "�e�nQQ��" <55079536 <at> qq.com>
To: "12023" <12023 <at> debbugs.gnu.org>
Subject: RE��bug#12023: closed (Re: bug#12023: bug of hostid cmd ?)
Date: Mon, 23 Jul 2012 22:00:10 +0800

[Message part 1 (text/plain, inline)]

HI, guy,

Thanks for your reply, I add the file /etc/hostid, and get a fixed hostid value.

But, can you please tell me why my hostid will change when there is not /etc/hostid.

Thx.



On 07/22/2012 04:44 AM,   wrote:
> HI, guy,
> 
> Can you tell me how the "hostid" command work? or how can I control my "hostid"?
> 
> Why my output from "hostid " switch around "0a799228", "0a799a28", "0a799328" randomly?
> 
> Here are lists of my "hostid" information, if any other information needed, please just mail me directly.
> 
> Hope to get you reply soon, thanks.
> 
> [lin <at> centos ~]$ hostid
> 0a799228
> [lin <at> centos ~]$ hostid
> 0a799a28
> [lin <at> centos ~]$ hostid
> 0a799328
> [lin <at> centos ~]$ rpm -q coreutils
> coreutils-8.4-19.el6.i686
> [lin <at> centos ~]$ rpm -q centos-release
> centos-release-6-3.el6.centos.9.i686
> [lin <at> centos ~]$ which hostid
> /usr/bin/hostid
> [lin <at> centos ~]$ ldd /usr/bin/hostid 
>     linux-gate.so.1 =>  (0x00dc0000)
>     libc.so.6 => /lib/libc.so.6 (0x00902000)
>     /lib/ld-linux.so.2 (0x008dc000)
> [lin <at> centos ~]$


------------------ ԭʼ�ʼ� ------------------
������: "GNU bug Tracking System"<help-debbugs <at> gnu.org>;
����ʱ��: 2012��7��22��(������) ����8:12
�ռ���: " e nQQ  "<55079536 <at> qq.com>; 

����: bug#12023: closed (Re: bug#12023: bug of hostid cmd ?)



Your bug report

#12023: bug of hostid cmd ?

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 12023 <at> debbugs.gnu.org.

-- 
12023: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12023
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (text/html, inline)]

Message #16 received at 12023 <at> debbugs.gnu.org (full text, mbox):

From: P��draig Brady <P <at> draigBrady.com>
To: � <55079536 <at> qq.com>
Cc: 12023 <12023 <at> debbugs.gnu.org>
Subject: Re: bug#12023: � closed (Re: bug#12023: bug of hostid cmd ?)
Date: Mon, 23 Jul 2012 15:16:00 +0100

On 07/23/2012 03:00 PM, � wrote:
> HI, guy,
> 
> Thanks for your reply, I add the file /etc/hostid, and get a fixed hostid value.
> 
> But, can you please tell me why my hostid will change when there is not /etc/hostid.
> 
> Thx.
> 
> 
> 
> On 07/22/2012 04:44 AM,   wrote:
>> HI, guy,
>>
>> Can you tell me how the "hostid" command work? or how can I control my "hostid"?
>>
>> Why my output from "hostid " switch around "0a799228", "0a799a28", "0a799328" randomly?
>>
>> Here are lists of my "hostid" information, if any other information needed, please just mail me directly.
>>
>> Hope to get you reply soon, thanks.
>>
>> [lin <at> centos ~]$ hostid
>> 0a799228
>> [lin <at> centos ~]$ hostid
>> 0a799a28
>> [lin <at> centos ~]$ hostid
>> 0a799328
>> [lin <at> centos ~]$ rpm -q coreutils
>> coreutils-8.4-19.el6.i686
>> [lin <at> centos ~]$ rpm -q centos-release
>> centos-release-6-3.el6.centos.9.i686
>> [lin <at> centos ~]$ which hostid
>> /usr/bin/hostid
>> [lin <at> centos ~]$ ldd /usr/bin/hostid 
>>     linux-gate.so.1 =>  (0x00dc0000)
>>     libc.so.6 => /lib/libc.so.6 (0x00902000)
>>     /lib/ld-linux.so.2 (0x008dc000)
>> [lin <at> centos ~]$
> 
> 
> ------------------ ԭʼ�ʼ� ------------------
> ������: "GNU bug Tracking System"<help-debbugs <at> gnu.org>;
> ����ʱ��: 2012��7��22��(������) ����8:12
> �ռ���: " e nQQ  "<55079536 <at> qq.com>; 
> 
> ����: bug#12023: closed (Re: bug#12023: bug of hostid cmd ?)
> 
> 
> 
> Your bug report
> 
> #12023: bug of hostid cmd ?
> 
> which was filed against the coreutils package, has been closed.
> 
> The explanation is attached below, along with your original report.
> If you require more details, please reply to 12023 <at> debbugs.gnu.org.

glibc is operating like this shell script.
You can run it to check your system:

echo "
from socket import gethostname as hostname
from socket import gethostbyname as ip
for i in range(10):
    print ''.join('%02x' % int(x) for x in ip(hostname()).split('.'))
" | python | uniq -c

cheers,
P��draig.

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