Difference between revisions of "Access control for StoRM storage elements"
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This page is part of an investigation on [[How to control access rights for LFC/SRM files]] . | This page is part of an investigation on [[How to control access rights for LFC/SRM files]] . | ||
| − | = Finding out | + | = Finding out which storage systems are available = |
To list the storage systems to which you have access use | To list the storage systems to which you have access use | ||
| Line 24: | Line 24: | ||
'''Note''' the current version of the <tt>lcg-infosites</tt> command does not use your grid proxy at all ! | '''Note''' the current version of the <tt>lcg-infosites</tt> command does not use your grid proxy at all ! | ||
| − | You can | + | You can use the <tt>srmping</tt> command to get some basic information about a storage system |
| − | $ | + | $ srmping -2 srm://srm.grid.rug.nl |
| − | SRMClientV2 : | + | SRMClientV2 : srmPing: try # 0 failed with error |
SRMClientV2 : ; nested exception is: | SRMClientV2 : ; nested exception is: | ||
java.net.NoRouteToHostException: No route to host | java.net.NoRouteToHostException: No route to host | ||
| − | SRMClientV2 : | + | SRMClientV2 : srmPing: try again |
Ah, the SRM server is listening on a different port. Storm documentation suggests using port 8444: | Ah, the SRM server is listening on a different port. Storm documentation suggests using port 8444: | ||
| + | $ srmping -2 srm://srm.grid.rug.nl:8444 | ||
| + | VersionInfo : v2.2 | ||
| + | backend_type:StoRM | ||
| + | backend_version:<FE:1.4.0-01.sl4><BE:1.4.0-00> | ||
| + | |||
| + | So host <tt>srm.grid.rug.nl</tt> is a SRMv2.2 compliant storage system based on StoRM | ||
| + | |||
| + | = Finding out how storage is organized = | ||
| + | |||
| + | You can use the <tt>srmls</tt> command to figure out how the storage is organized: | ||
$ srmls -l srm://srm.grid.rug.nl:8444/ | $ srmls -l srm://srm.grid.rug.nl:8444/ | ||
srm client error: | srm client error: | ||
| Line 36: | Line 46: | ||
- Status code: SRM_FAILURE | - Status code: SRM_FAILURE | ||
- Explanation: All requests failed | - Explanation: All requests failed | ||
| − | + | It seems that StoRM does not allow the listing of arbitary remote directories. | |
| − | |||
By looking at a file that was previously stored on srm.grid.rug.nl (using <tt>lcg-lr</tt>) we guess that the directory structure starts with the VO: | By looking at a file that was previously stored on srm.grid.rug.nl (using <tt>lcg-lr</tt>) we guess that the directory structure starts with the VO: | ||
$ srmls srm://srm.grid.rug.nl:8444/pvier/ | $ srmls srm://srm.grid.rug.nl:8444/pvier/ | ||
| Line 44: | Line 53: | ||
0 /pvier/generated | 0 /pvier/generated | ||
| − | Indeed, we're at the VO level. | + | Indeed, we're at the VO level. |
| + | |||
= Creating your own directory in SRM-space = | = Creating your own directory in SRM-space = | ||
Revision as of 14:42, 20 August 2009
This page is part of an investigation on How to control access rights for LFC/SRM files .
Finding out which storage systems are available
To list the storage systems to which you have access use
lcg-infosites --vo <YOUR-VO> se
which results in
Avail Space(Kb) Used Space(Kb) Type SEs ---------------------------------------------------------- 12078 108 n.a srm.grid.rug.nl 12078 108 n.a srm.grid.rug.nl 730582644 681194097 n.a gb-se-amc.amc.nl 8226695519985 23304480014 n.a srm.grid.sara.nl 605355546 806421195 n.a gb-se-nki.els.sara.nl 6575746866 20920246 n.a carme.htc.biggrid.nl 152913518 115521938 n.a se.grid.rug.nl 248345185 1166074827 n.a gb-se-ams.els.sara.nl 355230761 1056545980 n.a gb-se-uu.science.uu.nl 1266740857 145035883 n.a gb-se-wur.els.sara.nl 337812899 1076607113 n.a gb-se-kun.els.sara.nl 2195706454 3048365 n.a tbn18.nikhef.nl 771834491 620488567 n.a gb-se-lumc.lumc.nl
Note the current version of the lcg-infosites command does not use your grid proxy at all !
You can use the srmping command to get some basic information about a storage system
$ srmping -2 srm://srm.grid.rug.nl
SRMClientV2 : srmPing: try # 0 failed with error
SRMClientV2 : ; nested exception is:
java.net.NoRouteToHostException: No route to host
SRMClientV2 : srmPing: try again
Ah, the SRM server is listening on a different port. Storm documentation suggests using port 8444:
$ srmping -2 srm://srm.grid.rug.nl:8444 VersionInfo : v2.2 backend_type:StoRM backend_version:<FE:1.4.0-01.sl4><BE:1.4.0-00>
So host srm.grid.rug.nl is a SRMv2.2 compliant storage system based on StoRM
Finding out how storage is organized
You can use the srmls command to figure out how the storage is organized:
$ srmls -l srm://srm.grid.rug.nl:8444/ srm client error: java.lang.Exception: Return status: - Status code: SRM_FAILURE - Explanation: All requests failed
It seems that StoRM does not allow the listing of arbitary remote directories. By looking at a file that was previously stored on srm.grid.rug.nl (using lcg-lr) we guess that the directory structure starts with the VO:
$ srmls srm://srm.grid.rug.nl:8444/pvier/
0 /pvier/
0 /pvier/vletgenerated
0 /pvier/generated
Indeed, we're at the VO level.
Creating your own directory in SRM-space
Before we copy a file to the dCache SRM we first create our own directory. If we do not do this then SRM will store the files in generated directories, over which we have little or no control.
srmmkdir srm://srm.grid.rug.nl:8444/pvier/janjust
The URL for this directory will be used throughout the rest of this page, hence we abbreviate it to
SRM=srm://srm.grid.rug.nl:8444/pvier/janjust
Copying and registering your file
Next we will copy a file to our SRM directory and register it in the LFC in one go:
$ lcg-cr -d $SRM/myfile -l lfn:/grid/pvier/janjust/my-storm-file file://$PWD/myfile guid:1601bad4-c236-4f01-a4fb-54e12c7dc0a9
which returns the LFC GUID for the file upon success.
(For details on how to find out how the LFC directory space is organized see Access control for the LFC)
We could also have copied the file to the SRM only, bypassing the LFC registration, using the command
lcg-cp file://$PWD/myfile $SRM/myfile
or even
srmcp -globus_tcp_port_range=20000,25000 file://$PWD/myfile $SRM/myfile
but as we needed the LFC entry as well we used the (preferred) lcg-cr command. Please also note that the srmcp command is not very well supported.
Looking at the permissions
For a file that is copied to an SRM and that is registered in the LFC there are 2 sets of permissions:
- SRM-level
- LFC-level
These permissions are not directly related to each other and need to be modified separately. In this section we explain how to modify the SRM-level permissions. The LFC-level permissions are explained in Access control for the LFC.
$ srm-get-permissions $SRM/myfile srm-get-permissions $SRM/myfile Return code: SRM_NOT_SUPPORTED Explanation: Not supported
permissions array is null
Uh-oh... it looks like StoRM does not support permissions or access control
Modifying the permissions
Not supported
Verifying access control
Not supported
Modifying default directory permissions
Not supported
