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XROOTD-L  February 2015

XROOTD-L February 2015

Subject:

IPv6 cmsd connection issue

From:

Erik Gough <[log in to unmask]>

Reply-To:

Support use of xrootd by HEP experiments <[log in to unmask]>

Date:

Tue, 24 Feb 2015 11:26:37 -0500

Content-Type:

multipart/mixed

Parts/Attachments:

Parts/Attachments

text/plain (63 lines) , xrootd-clustered.cfg (1 lines)

Hello,

We recently upgraded to xrootd 4.0.4 at Purdue and enabled IPv6 on our
xrootd redirector and servers.  We see an issue where cmsd is unable to
connect to xrootd.unl.edu (another IPv6 enabled redirector).  I attached
our xrootd config.  We point to the FNAL redirector for AAA.

If I simply restart xrootd/cmsd on our redirector, any connection from
either the CERN or FNAL redirector ends with a '[3011] No servers are
available to read the file'.

In the cmsd log I see this repeated every few seconds:
150220 10:27:34 34373 Login: xrootd.unl.edu login failed;
rejected               
150220 10:27:34 34373 Remove completed xrootd.unl.edu manager
1.17               
150220 10:27:34 34373 Manager: manager.0:[log in to unmask] removed; lost
connection

If I disable ipv6 on our redirector, cmsd will immediately connect to
xrootd.unl.edu using ipv4.              
                                                                                 
150220 10:28:01 34373 Add xrootd.unl.edu to manager config;
id=1                 
150220 10:28:01 34373 ManTree: Now connected to 2 root
node(s)                   
150220 10:28:01 34373 Protocol: Logged into xrootd.unl.edu     

Then if I enable ipv6 and restart the network service I am able to do
both v4/v6 transfers using both CERN/FNAL redirectors.

It seems like for AAA access, there is a requirement for me to have a
cmsd connection to xrootd.unl.edu and it does not work over IPv6.

Before I do the disable/enable v6 thing, I do not see a connection open
between Purdue and UNL.  I do see an ipv4 one between Purdue and FNAL
without intervention on my part.

After I disable/enable v6, I see this and things start working.

cmsd      26416  xrootd   23u  IPv4 2179617      0t0  TCP
xrootd.rcac.purdue.edu:47154->xrootd.unl.edu:mpc-lifenet (ESTABLISHED)

If the UNL redirector gets restarted, that connection is lost and I have
to the restart/enable/disable steps again for redirection from CERN or
FNAL to work.

It seems like there is some ipv6 weirdness between the UNL and Purdue
redirector.  Is this a known issue?  Perhaps it is already solved in the
4.1.1 release?  If so, we can just wait for OSG to release it and
upgrade.  But, I figured I should let you know what I found just in case
you had not seen this issue before.

Thanks,
-Erik

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# Specify which port to use xrd.port 1094 # The export directive indicates which paths are to be exported. While the # default is '/tmp', we indicate it anyway and add the 'stages attribute # to allow you to start the frm_xfrd to bring in missing files into '/tmp'. # Remove this attribute if you don't want to enable this feature. # all.export / nostage all.role server all.role supervisor if cms-d*.rcac.purdue.edu all.role manager if xrootd.rcac.purdue.edu all.manager xrootd.rcac.purdue.edu:3121 all.manager meta all cmsxrootd.fnal.gov+ 1213 all.sitename T2_US_Purdue cms.space min 2g 5g cms.allow host xrootd.rcac.purdue.edu cms.allow host cms*.rcac.purdue.edu #authorization ofs.authorize 1 acc.authdb /etc/xrootd/Authfile acc.audit deny grant #logging xrootd.trace emsg login stall redirect ofs.trace none xrd.trace conn cms.trace all # Security configuration sec.protocol /usr/lib64 gsi -certdir:/etc/grid-security/certificates -cert:/etc/grid-security/xrd/xrdcert.pem -key:/etc/grid-security/xrd/xrdkey.pem -crl:3 -authzfun:libXrdLcmaps.so -authzfunparms:--osg,--lcmapscfg,/etc/xrootd/lcmaps.cfg,--loglevel,0|useglobals -gmapopt:10 -gmapto:0 xrootd.seclib /usr/lib64/libXrdSec.so xrootd.fslib /usr/lib64/libXrdOfs.so ofs.osslib /usr/lib64/libXrdHdfs.so all.adminpath /var/run/xrootd all.pidpath /var/run/xrootd cms.delay startup 10 cms.fxhold 60s if xrootd.rcac.purdue.edu cms.delay startup 10 qdl 30 cms.dfs lookup distrib mdhold 10m redirect immed fi oss.namelib /usr/lib64/libXrdCmsTfc.so file:/apps/osg/cmssoft/cms/SITECONF/T2_US_Purdue/PhEDEx/storage.xml?protocol=hadoop if exec xrootd xrd.report xrootd.t2.ucsd.edu:9931 every 30s all xrootd.monitor all auth flush 30s mbuff 1472 window 5s dest files io info user xrootd.t2.ucsd.edu:9930 fi # The copycmd directive tells the frm_xfrd what to use to copy files into # an exported path with the 'stage' attribute. Here we just say this will # be '/bin/cp' to allow the frm_xfrd to actual start to show that it works. # Here missing files are created in /tmp as zero-length files. # frm.xfr.copycmd /bin/cp /dev/null $PFN # The adminpath and pidpath variables indicate where the pid and various # IPC files should be placed # all.adminpath /var/spool/xrootd all.pidpath /var/run/xrootd ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1

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