Frontend

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(Czech version)

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Accessing machines

Frontend in MetaCentrum is a machine, to which users can log in directly, without reservation.

Frontends are the following machines:

Machine name System Home directory Note
skirit.ics.muni.cz Debian 8 /storage/brno2/home/ (PBS server @arien-pro) NEW! PBS Pro batch system
alfrid.meta.zcu.cz Debian 8 /storage/plzen1/home/ (PBS server @arien-pro) NEW! PBS Pro batch system
tarkil.grid.cesnet.cz Debian 8 /storage/praha1/home/ supports AES (Advanced Encryption Standard) which is used with Kerberos on MacOS, (PBS server @arien-pro) NEW! PBS Pro batch system
nympha.zcu.cz Debian 8 /storage/plzen1/home/ (PBS server @arien-pro) NEW! PBS Pro batch system
hermes.metacentrum.cz decommissioned
minos.zcu.cz Debian 8 /storage/plzen1/home/ (PBS server @arien-pro) NEW! PBS Pro batch system
perian.ncbr.muni.cz Debian 8 /storage/brno2/home/ (PBS server @arien-pro) NEW! PBS Pro batch system
onyx.ncbr.muni.cz Debian 8 /storage/brno2/home/ (PBS server @arien-pro) NEW! PBS Pro batch system
zuphux.cerit-sc.cz Debian 8 --> Centos 7.3 /storage/brno3-cerit/home/ (PBS server @wagap-pro) NEW! PBS Pro batch system

The same names are also aliased to the metacentrum.cz domain, e.g. skirit.metacentrum.cz.


To change batch system in yur home directory on any frontend:

cd /storage/brno3-cerit/home/$LOGNAME
export PBS_SERVER=wagap-pro.cerit-sc.cz


Usage of frontends

Please consider that frontends are shared among all users. If you need to run interactively some demanding activity, like working with huge amount of data or software compilation, please don't use the frontend but rather reserve some computing node for an interactive jobs. Such operations could slow down the frontend and bother other users.

Warning.gif Warning: Use the direct access to data storages to manipulate with huge amounts of data.

Home directory

Home directory is accessible from all frontends, for example

 /storage/brno2/home/$LOGNAME

Login notes

  • You should use the ssh protocol for remote access to clusters because it encrypts all communication.
  • For login you can use all SSH possibilities such as password, Kerberos or the ssh key. You should use so called Kerberos tickets for working with machines. Without them you cannot submit jobs via qsub command and the NFS4 directories, such as all /storage directories connected from non-local cities.
    • You will automatically obtain the Kerberos tickets while login with password.
    • You should delegate the tickets in Kerberos client while using local Kerberos authentication. Just edit the file /etc/ssh/ssh_config or ~/.ssh/config and change the value of variable GSSAPIDelegateCredentials to yes (default is no).
    • You can not delegate the Kerberos tickets while using ssh key. After the login via ssh key you have to abotain tickets via kinit command.
  • Frontend tarkil.metacentrum.cz supports AES (Advanced Encryption Standard) working with Mac OS. To log on MetaCentrum from Mac OS use
 ssh -K <$LOGNAME>@tarkil.metacentrum.cz

Node for master/submitting jobs

If you would like to automatically submit jobs to planning system PBS with diferent inputs, or automatically set inputs or steps of a new jobs according to results of a previous job, you can use special computational node oven.ics.muni.cz. On this node you can run long-term jobs which are able to manage other jobs.