Re: a question about BLCR

From: shuxi liu (liushuxi2009_at_gmail.com)
Date: Sat May 30 2009 - 08:13:32 PDT

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    hello Paul and Sergio,
       thanks for all your help.In my opinino,maybe I can't use BLCR to do
    checkpoint t abuot Apache.
      But nowadys I do some research in Software fault-tolerance.I do need to do
    checkpoint t abuot Apache.
     Can you  recommend some software to make it?
    
    thank you for your help.
    
    
                                                           Jack
    
    2009/5/27 Paul H. Hargrove <PHHargrove_at_lbl_dot_gov>
    
    > Jack,
    >
    >
    > There are at least 2 things that come to mind for the error you report
    > 1) As Sergio has suggested, you may have an LD_LIBRARY_PATH that is
    > pointing only to 32- or 64-bit libraries when apache needs the one not in
    > LS_LIBARARY_PATH.
    >
    > 2) If the apache binary is setuid or setgid, then I beleive the system will
    > refuse/ignore any LD_PRELOAD settings as a security measure.  If that is the
    > case, then there is probably no way to get cr_run and setuid/setgid to work
    > together.
    >
    > -Paul
    >
    >
    > Sergio Díaz wrote:
    >
    >> Hello,
    >>
    >> This error seems that you are trying to run an application compiled in
    >> other architecture (64 or 32 bits).
    >> Maybe Paul can give you more clues.
    >>
    >> Regards,
    >> Sergio
    >>
    >>
    >> shuxi liu escribió:
    >>
    >>> hello,
    >>>   thanks for your reply.As you know,I have done the cr_checkpoint and
    >>> cr_restart in example of counting.
    >>>  but when i use cr_cun,also some errors.
    >>> [root@fedora10 builddir]# cr_run
    >>> /root/blcr-0.8.1/builddir/examples/counting/counting
    >>> ERROR: ld.so: object 'libcr_run.so.0' from LD_PRELOAD cannot be
    >>> preloaded: ignored.
    >>> can you tell me how to make it,thank you very much
    >>>               jack
    >>>
    >>>
    >>>  2009/5/25 Sergio Díaz <sdiaz@cesga.es <mailto:sdiaz@cesga.es>>
    >>>
    >>>    Hi,
    >>>
    >>>    I don't know why are you trying to do a checkpoint to apache....
    >>>    and if it is possible to do a checkpoint to a daemon, but to get a
    >>>    successful checkpoint, you have to run the application with the
    >>>    command cr_run. For example: "cr_run ./sleep.sh" then you can do
    >>>     cr_checkpoint.
    >>>    Also, you have to load the checkpoint modules (blcr.ko and
    >>>    blcr_import.ko). If not, the error is the same.
    >>>
    >>>
    >>>    Regards,
    >>>    Sergio
    >>>
    >>>
    >>>    shuxi liu escribió:
    >>>
    >>>        hello sir or madam,
    >>>            I have used blcr-0.8.1 in 2.6.27.5-117.fc10.i686,and i
    >>>        have done the example of counting.
    >>>            I want to make checkpoint to apache, but i have some problem.
    >>>            httpd pid is 3170
    >>>          [root@fedora10 blcr-0.8.1]# cr_checkpoint 3170
    >>>          Checkpoint failed: support missing from kernel
    >>>          i don't know how to make checkpoint to apache.i need your help.
    >>>          i look forward to your reply.thank you very much.
    >>>                                         turely yours
    >>>                                              Jack
    >>>
    >>>
    >>>    --     Sergio Díaz Montes
    >>>    Centro de Supercomputacion de Galicia
    >>>    Avda. de Vigo. s/n (Campus Sur) 15706 Santiago de Compostela (Spain)
    >>>    Tel: +34 981 56 98 10 ; Fax: +34 981 59 46 16
    >>>    email: sdiaz@cesga.es <mailto:sdiaz@cesga.es> ; http://www.cesga.es/
    >>>    ------------------------------------------------
    >>>
    >>>
    >>>
    >>
    >>
    >
    > --
    > Paul H. Hargrove                          PHHargrove_at_lbl_dot_gov
    > Future Technologies Group
    > HPC Research Department                   Tel: +1-510-495-2352
    > Lawrence Berkeley National Laboratory     Fax: +1-510-486-6900
    >
    >
    

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