Re: [xcat-user] Fw: Re: /usr/bin/ping on diskless lost capabilities rhel7.2

Sun, 16 Apr 2017 20:36:18 -0700

hi  David D. Johnson,
 
this is a issue we have fixed in https://github.com/xcat2/xcat-core/issues/922 in xCAT 2.12.2.
 
 
The key to preserve the "capability" of the file is the archive method, so use "-m tar"  instead of "-m cpio" is adequate. The compress method is the option for user to trade off between compress time and compress ratio, "-c xz" will cost a lot of time to compress, "-c gzip" or "-c pigz" might be an option for you.  The poor support of compress options is a problem for us, you can open a ticket on GitHub if you really need this, we will consider to do some enhancement in the future releases.
 
thanks
------------------------------------------------------------------------------
YANG Song (杨嵩)
IBM China System Technology Laboratory
Tel: 86-10-82452903
Email: yang...@cn.ibm.com
Address: Building 28, ZhongGuanCun Software Park,
No.8, Dong Bei Wang West Road, Haidian District Beijing 100193, PRC

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邮编: 100193
 
 
----- Original message -----
From: Xiao Peng Wang/China/IBM
To: Song BJ Yang/China/IBM@IBMCN
Cc:
Subject: Fw: Re: [xcat-user] /usr/bin/ping on diskless lost capabilities rhel7.2
Date: Fri, Apr 14, 2017 9:14 AM
 
Any idea?

Best Regards
----------------------------------------------------------------------
Wang Xiaopeng (王晓朋)
 
Manager for HPC SW Dev: xCAT, ESSL, SMI, Test
IBM China Systems Laboratory (CSL)

Tel: 86-10-82453455
Email: w...@cn.ibm.com
 
 
----- Original message -----
From: "David D. Johnson" <david_john...@brown.edu>
To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net>
Cc:
Subject: Re: [xcat-user] /usr/bin/ping on diskless lost capabilities rhel7.2
Date: Fri, Apr 14, 2017 12:40 AM
 
Thanks for the help.  Tar works where cpio didn’t.  However, switching from gzip to xz
costs 9 extra minutes (10 vs 1) in the packimage step. I couldn’t find a knob to twist to
make it use xz -0 or xz -3 rather than the default level -6 compression, and XZ_OPTS was
not passed from the environment where packimage was called to the actual xz process.

— ddj


> On Apr 10, 2017, at 4:09 PM, Jarrod Johnson <jjohns...@lenovo.com> wrote:
>
> There's a new packmigae format, txz. -m tar -c xz.
>
> Tar will preserve those capabilities, cpio will not.  Too bad we didn't pick tar to start with back in the day...
>
> -----Original Message-----
> From: David D. Johnson [mailto:david_john...@brown.edu]
> Sent: Monday, April 10, 2017 2:50 PM
> To: xCAT Users Mailing list
> Subject: [xcat-user] /usr/bin/ping on diskless lost capabilities rhel7.2
>
> mgt# getcap /usr/bin/ping
> /usr/bin/ping = cap_net_admin,cap_net_raw+p mgt# ssh compute compute# getcap /usr/bin/ping compute#
>
> Somewhere along the line, unpacking the rootimg I would guess, the binary for ping and its friends loses the required privilege / capability to actually function for non-root user.
>
> With RH6, ping was setuid, which didn’t get lost at boot time.
>
> Anybody have a workaround?
>
> Thanks,
> — ddj
> Dave Johnson
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