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Frontend login
Users connect to MetaCentrum by using ssh to any of the login nodes called frontends.
In Linux, macOS, Windows PowerShell and MobaXterm the ssh command can be given in the terminal.
Open the terminal and on CLI type
If you log in for the first time, you will be prompted by a query similar to the following:
Type “yes”. The public key of the frontend will be saved to your ~/.ssh/known_hosts file.
Tip
Strictly speaking the user should always verify a new key before adding it to a list of known hosts. For a howto on SSH key verification, see more detailed page on SSH key verification.
Once the terminal connection to a frontend is open you can start using it with the Linux command line tools (bash shell).
A complete list of frontends is given below. You can use any of them. We encourage users to pick one that is closest to their physical location (city) to minimize network lag.
Tip
In case your favourite frontend is down or going just too slow, do not hesitate to use another one.
| Frontend address | Aliased as | Native home | OS | Physically located in | Note |
|---|---|---|---|---|---|
| charon.nti.tul.cz | charon.metacentrum.cz | /storage/liberec3-tul | Debian 12 | Liberec | |
| elmo.elixir-czech.cz | elmo.metacentrum.cz | /storage/praha5-elixir | Debian 12 | Praha | Dedicated to Elixir users |
| luna.fzu.cz | luna.metacentrum.cz | /storage/praha1 | Debian 12 | Praha | Reserved for FZU users |
| nympha.meta.zcu.cz | nympha.metacentrum.cz, nympha.zcu.cz, minos.zcu.cz, minos.meta.zcu.cz, alfrid.meta.zcu.cz | /storage/plzen1 | Debian 12 | Plzen | |
| oven.metacentrum.cz | /storage/brno2 | Debian 12 | Brno | Reserved to access oven node only | |
| perian.grid.cesnet.cz | perian.metacentrum.cz, onyx.metacentrum.cz | /storage/brno2 | Debian 12 | Brno | |
| skirit.ics.muni.cz | skirit.metacentrum.cz | /storage/brno2 | Debian 12 | Brno | |
| tarkil.grid.cesnet.cz | tarkil.metacentrum.cz | /storage/praha1 | Debian 12 | Praha | |
| tilia.ibot.cas.cz | tilia.metacentrum.cz | /storage/pruhonice1-ibot | Debian 12 | Pruhonice | |
| zenith.cerit-sc.cz | zenith.metacentrum.cz | /storage/brno12-cerit | Debian 12 | Brno |
Warning
The frontend nodes can be used for light pre- and postprocessing and manipulation of data. All other tasks must be submitted as jobs to the batch job system. If you need to run something interactively, submit an interactive job.
Web services login
Some web services require user authentication. While for example in OnDemand service users use their MetaCentrum login and password, other services login is done through the user’s institution identity.
For example, let’s say you are ČZU user wanting to login to see a list of queues in MetaVO pages.
In this case, choose the “ČZU” tab from the list and fill in ČZU credenials, not MetaCentrum login and username.
Kerberos
After the user enters MetaCentrum infrastructure by logging in, they will need also to be able to move between computational nodes, reach storage spaces residing on different machines etc. It would be very inconvenient to authenticate by password every time. Therefore the authentication of user within the MetaCentrum infrastructure is done by Kerberos protocol.
After the user logs in, they automatically obtain a Kerberos tickets. As long as the ticket is valid, user can move between machines, run jobs, copy files without bothering about the authentication.
Warning
The ticket is valid for 10 hours. If you stay logged in for longer, you will need to re-generate your ticket with kinit command.
Basic Kerberos commands
klist- list all current ticketskdestroy- delete all ticketskinit- create new Kerberos ticket
It is also possible to install Kerberos on your PC. For more in-depth info, see Kerberos advanced page.
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