Sds-hd nfs: Difference between revisions
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#REDIRECT [[SDS@hd]] |
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<H1>Using NFSv4 for UNIX client</H1> |
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'''Attention:''' To access data served by SDS@hd, you need a '''''Service Password'''''. Please set your '' '''Service Password''' '' under following site: https://bwservices.uni-heidelberg.de |
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<br> |
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<H2>Prequisites</H2> |
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Authentication for data access via NFSv4 is performed using Kerberostickets. This requires a functioning Kerberos environment on the client! |
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A detailed tutorial for installing a working NFS & Kerberos environment is described in the [https://sds-hd.urz.uni-heidelberg.de/management/index.php?mode=access_lx_nfssetup SDS@hd Managementtool]. |
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<H2>mount a nfs share</H2> |
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The usual restrictions for mounting drives under Linux are valid. Usually this can only be done by the superuser "root". For detailed information, please contact the system administrator of your system. |
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After successfull configuration (s. Prequisites) you can mount your SDS@hd share with the following commands: |
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<pre> |
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> mkdir <mountpoint> |
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> mount -t nfs4 -o sec=krb5 lsdf02.urz.uni-heidelberg.de:/gpfs/lsdf02/ <mountpoint> |
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</pre> |
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To enable the mounting after a restart, you have to add the following line to the file "/etc/fstab" |
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<pre> |
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lsdf02.urz.uni-heidelberg.de:/gpfs/lsdf02/ <mountpoint> nfs4 sec=krb5 0 0 |
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</pre> |
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<H2>access your data</H2> |
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'''Attention!''' The access can not be done as root user, because root uses the Kerberosticket of the machine, which does not have data access! |
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To access your data on SDS@hd you need an valid kerberos ticket: |
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<pre> |
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> kinit hd_xy123 |
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Password for hd_xy123@BWSERVICES.UNI-HEIDELBERG.DE: |
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> klist |
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Ticket cache: FILE:/tmp/krb5cc_1000 |
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Default principal: hd_xy123@BWSERVICES.UNI-HEIDELBERG.DE |
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Valid starting Expires Service principal |
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20.09.2017 04:00:01 21.09.2017 04:00:01 krbtgt/BWSERVICES.UNI-HEIDELBERG.DE@BWSERVICES.UNI-HEIDELBERG.DE |
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renew until 29.09.2017 13:38:49 |
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> ls mountpoint |
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sd16j007 sd17c010 sd17d005 |
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</pre> |
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<H3>renew a kerberos ticket</H3> |
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Because a kerberos ticket has a limited lifetime (default: 10 hours, maximum 24 hours) for security reasons, you have to renew your ticket before it expires to prevent access loss. |
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<pre> |
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> kinit -R |
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</pre> |
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This renewal could only be done for maximum time of 10 Days. |
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<H3>automated kerberos tickets</H3> |
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<strong>'''Attention!''' Keep this generated Keytab safe and use it only in trusted environments!</strong> |
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If your workflow needs a permanent access to SDS@hd for longer than 10 Days, you can use '''ktutil''' to encrypt your Service Password into a keytab file: |
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<pre> |
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ktutil |
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ktutil: addent -password -p hd_xy123@BWSERVICES.UNI-HEIDELBERG.DE -k 1 -e rc4-hmac |
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Password for hd_xy123@BWSERVICES.UNI-HEIDELBERG.DE: |
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ktutil: addent -password -p hd_xy123@BWSERVICES.UNI-HEIDELBERG.DE -k 1 -e aes256-cts |
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Password for hd_xy123@BWSERVICES.UNI-HEIDELBERG.DE: |
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ktutil: wkt xy123.keytab |
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ktuitl: quit |
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</pre> |
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With this keytab, you can acquire a kerberos ticket without an interactive password: |
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<pre> |
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kinit -k -t xy123.keytab hd_xy123 |
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</pre> |
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<br> |
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[[Category:Sds-hd|NFS|Kerberos]] |
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Latest revision as of 16:49, 19 August 2022
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