Servers and Workstations
C&CZ manages about 400 Linux servers and hundreds of Linux workstations and a few
servers with MS-Windows, primarily in the domain
science.ru.nl. Dual boot Windows/Linux machines are counted twice. The
servers are distributed over three datacenters.
Workstations
C&CZ manages (for departments) workstations with Ubuntu Linux. There are also workstations in the PC-rooms for general use by anybody with a Science login, but also by all RU employees and students and guests with a temporary login. Almost all those machines are dual boot, the user can choose to boot Ubuntu Linux or MS-Windows.
Linux login servers
A few secure shell servers are available for Students and Staff of the Faculty (everyone with a Science account). You can use it just as you like, as long as you do not cause problems for other users.
The primary login server can be reached with the following address:
lilo.science.ru.nl
At the moment, lilo points to a machine called lilo9 (Ubuntu 24.04).
The ssh fingerprints for lilo8 and lilo9 are:
256 SHA256:yVihq2mnLULOCBFdvO2RWBps33hdE6PmaIGeBXX44wY lilo8 (ECDSA)
256 SHA256:gsvoEP5djMC5GsXJJUYktYq3TjRtNQPKo0/psULHBYc lilo8 (ED25519)
3072 SHA256:gFrExKYRunrQQAkZit5mlLQrRXPaO3vU3GegM0/rP+o lilo8 (RSA)
256 SHA256:FtDPr17AUU3RXnNU8lLcMTDxvbf7Oy5D2+JwziPVvjI lilo9.science.ru.nl (ECDSA)
256 SHA256:BtSAmgYYj1bMut8en5QmyxVsDar22+WlloJPTNEtPkQ lilo9.science.ru.nl (ED25519)
You can test this with ssh-keyscan host | ssh-keygen -lf -.
To avoid the following ssh warning everytime we replace hardware or change the alias for lilo or stitch
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: POSSIBLE DNS SPOOFING DETECTED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
The ECDSA host key for lilo.science.ru.nl has changed
you can insert the following line into the file .ssh/known_hosts
@cert-authority *.science.ru.nl ecdsa-sha2-nistp521 AAAAE2VjZHNhLXNoYTItbmlzdHA1MjEAAAAIbmlzdHA1MjEAAACFBAHpJveyOrLKFRDsbiW/29OadbCbkmUaIXnWbhVwtytbpftAc7Stj2RYa8yBmgfdm82T/UBVu1tLbeeCYQI8UlCvbAALMx+I60ux+iEGVdDBgIOjeu6LuY12pksVlXy/nKc59+m3AdMXfGHA8cI/O8eFosQLJ+dck7SBcvTT4lPhEcSQxg==
Compute servers/clusters
C&CZ manages a number of compute clusters, with compute nodes that
departments have purchased. In a few cases, departments have created a
separate cluster by also purchasing their own head node (master). The
largest cn-cluster also has a number of nodes purchased by C&CZ, so
FNWI departments may use these after approval by C&CZ. For departments
of FNWI the housing and management of clusternodes is free of charge.
The cn-cluster is heterogeneous. All nodes have
SLURM as cluster software. As of February 2022, the
cn-cluster totalled 123 nodes with 4700 cores and 30 TB RAM. Several
clusternodes have a GPU with CUDA cores.
The Astrophysics coma cluster with 1048 cores, 8780 GB RAM, 600 TB fileserver storage, GPU’s is a separate cluster. A separate cluster is also managed for the RU department Centre for Language Studies.
Sometimes outside of opening hours also the pcs in the computer labs are used as a compute cluster.
A primitive overview of clusternodes is available, until we can fix something better to replace the old cricket overview.
On DIY, you can see your mail addresses, mail aliases as well as your forwarding settings. For information on how to use the email service and optionally, conffigure your email software, cunsult our Email howto.
WWW servers
There are several WWW-servers with websites and web applications. A description of the Apache webserver setup is available.
GitLab servers
The GitLab service provides a source code collaboration platform, git repository manager, issue tracker and code reviewer.
The ssh fingerprints for gitlab.science.ru.nl:
256 SHA256:BSSXi19WgCSpZu5AQkUTtwm+5zAMioQJpFE3oxBrIMQ root@gitlab (ECDSA)
256 SHA256:7G/4WD/tUE8H0k9MkBznlcx+ZWgUxnn3KazKm1XQwRk root@gitlab (ED25519)
2048 SHA256:NgZ9HciXlwG5JNPSFbem7bBbDbhqaNAO7JHag8rwi/I root@gitlab (RSA)
gitlab.pep.cs.ru.nl fingerprints:
256 SHA256:pBFiBobAQTozB0xeeMCp3Du2PFtX7YIXw6XRFJSAGH0 root@gitlab (ECDSA)
256 SHA256:iWfwGvGZ/hdFImBzzG5Bu/y5gqhUkLOdSTYmzl1+k2w root@gitlab (ED25519)
2048 SHA256:lWWFUfhwODG0bBuQJUR8ymlVfqpNHrXk0xbFAoDpTIg root@gitlab (RSA)
Printer server
One server is used to print jobs. See the printer webpage to see which server is advised in which situation.
License servers
For several software packages there is a license server, that allows use of the software on all pc’s, while making sure that the total number of licenses uses is not more than what has been bought. Most of these license servers use FlexNet by Flexera.