[Pvfs2-developers] config file issue

Sam Lang slang at mcs.anl.gov
Tue Feb 24 16:17:33 EST 2009 

I vote for option 3).

-sam

On Feb 24, 2009, at 1:28 PM, Walter Ligon wrote:

> Actually, I can do it - but it turns out that's not the whole story.
> So, by putting the short name in the config file the server finds  
> the entry, but on my system the short name is not known so it  
> doesn't work when we try to communicate.  I *must* use the long  
> name, and thus the -a option.
>
> At a minimum we need to alert the installer that the short name is  
> used in the search, but that they must use a valid name, and the -a  
> if that is not a short name.
>
> OR get rid of the name stripping, or allow both (search w/o  
> stripping, and if not found strip and search again).
>
> I don't know how common it is for distributions to use a long  
> hostname with no short alias - I know I've seen this on other  
> systems.  We should probably ask the group if we should change any  
> stripping behavior, and in any case document it well.
> ----------------------------
>
> So here is the summary (for the group to decide)
>
> current behavior - server uses gethostname and then strips the  
> domainname to get a short alias before searching the config file for  
> its data.
>
> Some machines do not use a short alias for address resolution so a  
> long name must be used in the config file - the auto search will not  
> find it.
>
> The -a option allows you to override.
>
> Possible options:
>
> 1) leave it and document it
>
> 2) remove the stripping, document that a valid network name must be  
> used
>
> 3) let auto search use both stripped and unstripped version for  
> convenience - document accordingly
>
> Opinions?
>
> Walt
>
> Sam Lang wrote:
>> Sounds good.  Do you want to update the install guide?  I'm not  
>> sure what text you're referring to exactly.  Its in CVS at doc/ 
>> pvfs2-quickstart.tex.  If you just want to send me the paragraph to  
>> add I can throw it in there.
>> -sam
>> On Feb 24, 2009, at 12:59 PM, Walter Ligon wrote:
>>> Ah, yes, the function guess_alias in pvfs2-server seraches for the  
>>> first period in the hostname and truncates the hostname there.
>>>
>>> Thus, we need to update the install guide to this fact, that the  
>>> proper thing to use in the genconfig script is the name returned  
>>> by hostname up to but not including the first period.  Unless they  
>>> plan to use the -a flag, in which case they can use whatever they  
>>> want.
>>>
>>> Walt
>>>
>>> Sam Lang wrote:
>>>> I think the hostname command uses the uname system call rather  
>>>> than gethostname.  We could add a match for whatever uname  
>>>> returns as well.
>>>> -sam
>>>> On Feb 24, 2009, at 10:50 AM, Walter Ligon wrote:
>>>>> ah, so you're saying the command line hostname and the library  
>>>>> call the server uses aren't returning the same thing?  That  
>>>>> makes sense.
>>>>>
>>>>> I ended up removing the domain from the config file and it  
>>>>> worked.  Must be an oddity of the way my machine is configed  
>>>>> that the name is reported two different ways.
>>>>>
>>>>> If there isn't a more robust mechanism (which there may not be)  
>>>>> then maybe the install guide should simply warn the user that it  
>>>>> might be an issue.
>>>>>
>>>>> Thanks for you help Sam!
>>>>>
>>>>> Walt
>>>>>
>>>>> Sam Lang wrote:
>>>>>> Hi Walt,
>>>>>> With the single config file in place now, the server has to be  
>>>>>> told (with the -a command line option) or guess which server it  
>>>>>> is.  It guesses by simply using the hostname, and you may have  
>>>>>> run into a bug.  I'll play with it and see if I can make it  
>>>>>> more robust.  In the meantime, you can use:   -a  
>>>>>> 172-22-9-126.lwapp.clemson.edu
>>>>>> -sam
>>>>>> On Feb 24, 2009, at 10:06 AM, Walter Ligon wrote:
>>>>>>> I probably did something wrong, but I got this error:
>>>>>>>
>>>>>>> sh-3.2# sbin/pvfs2-server /etc/pvfs2-fs.conf -f
>>>>>>> [S 02/24 10:58] PVFS2 Server on node 172-22-9-126 version  
>>>>>>> 2.7.1pre1-2009-01-27-183824 starting...
>>>>>>> [E 10:58:18.292013] Configuration file error. No host ID  
>>>>>>> specified for alias 172-22-9-126.
>>>>>>> [E 02/24 10:58] Could not find handle range for host (null)
>>>>>>> [E 02/24 10:58] Please make sure that the host names in /etc/ 
>>>>>>> pvfs2-fs.conf are consistent
>>>>>>> [D 02/24 10:58] PVFS2 Server: storage space created. Exiting.
>>>>>>>
>>>>>>> here is my config file:
>>>>>>>
>>>>>>> <Defaults>
>>>>>>>     UnexpectedRequests 50
>>>>>>>     EventLogging none
>>>>>>>     LogStamp datetime
>>>>>>>     BMIModules bmi_tcp
>>>>>>>     FlowModules flowproto_multiqueue
>>>>>>>     PerfUpdateInterval 1000
>>>>>>>     ServerJobBMITimeoutSecs 30
>>>>>>>     ServerJobFlowTimeoutSecs 30
>>>>>>>     ClientJobBMITimeoutSecs 300
>>>>>>>     ClientJobFlowTimeoutSecs 300
>>>>>>>     ClientRetryLimit 5
>>>>>>>     ClientRetryDelayMilliSecs 2000
>>>>>>>
>>>>>>>     StorageSpace /pvfs2-storage-space
>>>>>>>     LogFile /tmp/pvfs2-server.log
>>>>>>> </Defaults>
>>>>>>>
>>>>>>> <Aliases>
>>>>>>>     Alias 172-22-9-126.lwapp.clemson.edu tcp:// 
>>>>>>> 172-22-9-126.lwapp.clemson.edu:3334
>>>>>>> </Aliases>
>>>>>>>
>>>>>>> <Filesystem>
>>>>>>>     Name pvfs2-fs
>>>>>>>     ID 43450330
>>>>>>>     RootHandle 1048576
>>>>>>>     <MetaHandleRanges>
>>>>>>>             Range 172-22-9-126.lwapp.clemson.edu  
>>>>>>> 3-4611686018427387904
>>>>>>>     </MetaHandleRanges>
>>>>>>>     <DataHandleRanges>
>>>>>>>             Range 172-22-9-126.lwapp.clemson.edu  
>>>>>>> 4611686018427387905-9223372036854775806
>>>>>>>     </DataHandleRanges>
>>>>>>>     <StorageHints>
>>>>>>>             TroveSyncMeta yes
>>>>>>>             TroveSyncData no
>>>>>>>     </StorageHints>
>>>>>>> </Filesystem>
>>>>>>>
>>>>>>> and for reference:
>>>>>>>
>>>>>>> sh-3.2# hostname
>>>>>>> 172-22-9-126.lwapp.clemson.edu
>>>>>>>
>>>>>>>
>>>>>>> Should I have dropped the domain name when I created the  
>>>>>>> config file? The install instructions don't say anything about  
>>>>>>> that.
>>>>>>>
>>>>>>> Walt
>>>>>>> _______________________________________________
>>>>>>> Pvfs2-developers mailing list
>>>>>>> Pvfs2-developers at beowulf-underground.org
>>>>>>> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-developers
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