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12:43, 25 July 2024 Admin talk contribs created page RestoringCloudFrontendFromBackup (Created page with "= Context = In July 2024, we have lost our OpenNebula frontend VM (cloud2) after an attempt to reboot it. It was hosted on domz02, a basic QEMU/KVM standalone hypervizor managed with libvirt. The problem seemed to be that the system was not able to find the partition table in the qcow2 image. As there was no backup of the OpenNebula data and config files, the only solution to recover these things was to attach the image to a new VM and to recreate the partition table in...")
14:31, 16 July 2024 Admin talk contribs created page ExplainingApel (Created page with "= From HTCondor job history files to batch and blah files = Each time a job is finished, a job record is created in the directory /var/lib/condor/history. Thanks to a systemd timer, every hour, a script is run to parse these history records and to generate the blah and batch files from them. The blah and batch files are created in the directory /var/lib/condor-ce/apel.")
09:34, 12 March 2024 Admin talk contribs created page Jupyterlabt2b (Created page with "=== How to be able to work with jupyterlab on T2B using Linux personal machine === == Create file "config" in ~/.ssh directory of your personal machine. == Write into the config file: <pre> Host mlong HostName mlong.iihe.ac.be User your_username ForwardX11 yes ServerAliveInterval 100 LocalForward ???? localhost:????" </pre> ''???? is an identical 4-digit number you can invent yourself.'' Save and close the config file. Now you can connect to...")
10:32, 26 January 2024 Admin talk contribs deleted page User Using TensorFlow on GPU Nodes (content was: "== OBSOLETE == Although the T2B has GPUs, they are not supported by tensorflow. Ohters have reported that with the kind of GPU's we have, the results given by tensorflow might be wrong! We recommend to not use tensorflow on our GPUs", and the only contributor was "OLIVIER DEVROEDE omdevroe@vub.ac.be" (talk))
14:10, 3 January 2024 Admin talk contribs created page File:Htop.png
14:10, 3 January 2024 Admin talk contribs uploaded File:Htop.png
14:09, 3 January 2024 Admin talk contribs created page HTCondorDebug (Created page with "== Why is my job still in queue ? == To see what is happening and why your jobs are not starting, use: <pre>> condor_q -better-analyze 2993001.0 -- Schedd: schedd03.wn.iihe.ac.be : <192.168.10.147:9618?... The Requirements expression for job 2993001.000 is (TARGET.Arch == "X86_64") && (TARGET.OpSys == "LINUX") && (TARGET.Disk >= RequestDisk) && (TARGET.Memory >= RequestMemory) && (TARGET.HasFileTransfer) Job 2993001.000 defines the following attributes: Disk...")
10:11, 28 November 2023 Admin talk contribs created page File:Linux for beginners.pdf (Slides for the course: "Linux for beginners.)
10:11, 28 November 2023 Admin talk contribs uploaded File:Linux for beginners.pdf (Slides for the course: "Linux for beginners.)
09:59, 28 November 2023 Admin talk contribs created page Introduction to Linux (Created page with "This page contains an introduction to Linux given by one of the administrators from T2B: Stéphane Gérard. If you are new or unexperienced in Linux, please take this course as proper use of the cluster is important and can only be achieved if you know the basics well. 1) Link to the slides 2) Link to the video")
08:37, 5 October 2023 Admin talk contribs created page File:New certificate type.png
08:37, 5 October 2023 Admin talk contribs uploaded File:New certificate type.png
08:02, 9 May 2023 Admin talk contribs created page OpenID (Created page with "Grid facilities in general and CMS in particular ar slowly moving from a certificate/proxy based authentication towards an OpenID/token based authentication[BR] This page explains how to use them yourself at T2B == Getting an OpenID identity == * Go the CMS IAM service at https://cms-auth.web.cern.ch/ and log in * At the left, you can see you active tokens. At the moment, you have none. * Go to the M machines and issue the following command: <pre> oidc-gen --iss https://...")
14:36, 5 May 2023 Admin talk contribs created page CorrectWorkflow (Created page with " '''This page describes what we consider a correct workflow. '''It details how to efficiently use storage and compute resources at T2B, to enable fast analysis turnaround, but also avoid situations where a workflow will put stress on the cluster infrastructure and impact your fellow users. === Introduction === You will see here a few different points and what we, with our knowledge of the underlying infrastructure but also just experience and user returns, know...")
11:51, 4 April 2023 Admin talk contribs deleted page CephCrushMap (move to private wiki)
11:46, 4 April 2023 Admin talk contribs deleted page DeployCEphWithCephadm (content was: "=== On your first MON: === ==== Pre-Bootsrapping ==== To do on all mon and osd machines, remove '''network.network_backend''' & '''[machine]''' from '''/usr/share/containers/containers.conf''': <pre>sed -i 's:^network_backend:##network_backend:' /usr/share/containers/containers.conf sed -i 's:^\[machine\]:##\[machine\]:' /usr/share/containers/containers.conf podman image trust set...", and the only contributor was "Admin" (talk))
10:21, 22 February 2023 Admin talk contribs created page GPUatT2B (Created page with "Page in Construction ! == About GPUs at T2B == We do not have any GPUs at T2B. That does not mean you do not have access to some. === If you belong to a flamish university (VUB, UAntwerpen, UGent) === ---- You have access to all VSC clusters, with quite some choice in GPUs. Have a look at all VSC clusters available and their hardware on [https://docs.vscentrum.be/en/latest/hardware.html this page]. -> For instance, the '''VUB Hydra''' cluster has 4 nodes wit...")
09:42, 22 February 2023 Admin talk contribs created page ObsoletePages (Created page with " === Service work for CMS === *DDT *CMSSWDeployment * Prodagent for users * Writing tests in /store/temp/user on T2 SE's * CRAB Server installation * Basic validation of CRAB releases === Old PBS/Qsub Cluster [DEPRECATED] === **! Deprecated ! Old Qsub Cluster ** To the local resources ::* Sending unlimited number of Jobs :*GPUs|Using...")
13:48, 9 February 2023 Admin talk contribs created page DeployCEphWithCephadm (Created page with "=== On your first MON: === ==== Bootsrapping ==== cephadm bootstrap --mon-ip 192.168.8.1 --allow-overwrite --allow-fqdn-hostname --log-to-file ==== Checking MGR modules ==== ceph mgr module ls Now the dashboard module is enabled by default ==== Getting address of dashboard (and prometheus) ==== ceph mgr services ==== Enabling SSL on dashboard ==== First put the certificate and the key in '''cert.crt''' and '''cert.key''' respectively <pre>ceph dashboard set-ssl-ce...")
13:43, 23 November 2022 Admin talk contribs created page CERNGridUrls (Created page with "== CERN different Grid URLs to access EOS == CERN has different Grid URLs to access the EOS storage backend. Please try them to see if what you are looking for is present. Also, do not hesitate to tell us if you found one more that is relevant for you! * your CERNBOX home (more info for crab users [https://twiki.cern.ch/twiki/bin/view/CMSPublic/CRAB3FAQ#Can_I_send_CRAB_output_to_CERNBO here]): :<pre>gfal-ls gsiftp://eosuserftp.cern.ch/eos/user/s/somename</pre> * p...")
12:58, 12 October 2022 Admin talk contribs created page ResizingVMDisk (Created page with "==Goal== On this page, we will explain how to increase the size of a partition in a VM. The steps are the following: # Increase the size of the image # Increase the size of a partition # Resize the filesystem The details of the steps of this generic procedure will change depending on: * the type of backend storage (ONE datastore) for VM images (NFS share or Ceph); * the format of the image (qcow2, raw,...); * the type of partition (standard partitioning or LVM); * the ty...")
13:46, 9 September 2022 Admin talk contribs created page T2B Deletion Policy (Created page with "This page details the way accounts from former users are handled at T2B. IMPORTANT: This policy is valid for all users of T2B, except for staff members. For them, a special system is in place that protects their data. === General information === T2B has a lot of users coming and leaving every year. They create a lot of data that might be important to the rest of the collaboration, even after they left. This makes the removal of old accounts and their associated fi...")
09:36, 4 July 2022 Admin talk contribs created page HTCUpgrade (Created page with "= Overview = We plan to upgrade HTCondor from version 8.9 to 9.0. As it is a major change, it will require a complete reinstallation of all services. The main benefits of the new version is to be compatible with tokens, the replacement of certificates for GRID authentification. = Plan = As of 04/07, already 70% of job slots have been migrated. Most of GRID jobs are already using the new version. For you to have a more transparent experience during t...")
15:01, 5 April 2022 Admin talk contribs created page Run ETF tests locally (Created page with "To be independent of the ETF testing machine, it is sometimes handy to be able to run them locally, or at least from another machine. The reference at cern for this page is here for [https://twiki.cern.ch/twiki/bin/viewauth/CMS/SiteSupportSAMSEGSIftp GSIftp] and here for [https://twiki.cern.ch/twiki/bin/viewauth/CMS/SiteSupportSAMSE-WebDAV Webdav] == Location == The tests are now in /group/admin/ETFTests. This is a git repo, so it would be a good idea to run do a...")
10:27, 24 February 2022 Admin talk contribs created page Crontab (Created page with "=== Cron on the User Interfaces === Using the cron linux system, you can execute scripts at a regular defined time on our mX machines. At T2B, we have made the choice to have a shared crontab between every mX UI. This means that running <pre> crontab -e</pre> on any UI will give you access to your cron tasks. Since the tasks are shared, we've made sure they will execute on only one UI. We've set it to '''m4''' for now, but you can check this with crontab -c To writ...")
10:23, 16 February 2022 Admin talk contribs created page Using htmap (Created page with "== What is htmap? == It's a Python library that allows you to map some function calls out to an HTCondor cluster. It's really easy to use and it brings the computing power of our cluster into your Python codes. You'll find a more detailed presentation [https://htmap.readthedocs.io/en/latest/ here]. == How to use htmap with our HTCondor cluster? == There are many ways to use htmap, and we haven't tested all of them. This small tutorial will demonstrate how to use htma...")
09:30, 8 December 2021 Admin talk contribs created page PBS (Created page with " === Job submission === To submit a job, you just have to use the '''qsub''' command : <pre>qsub myjob.sh </pre> ''OPTIONS'' *-q queueName : choose the queue you want [mandatory] *-N jobName : name of the job *-I : (capital i) pass in interactive mode *-m mailaddress : set mail address (use in conjonction with -m) : MUST be @ulb.ac.be or @vub.ac.be *-m [a|b|e] : send mail on job status change (a = aborted , b = begin, e = end) *-l&nb...")
11:54, 23 September 2021 Admin talk contribs created page What if your DN has changed? (Created page with "In case you get a new certificate and your DN has changed, you need to update the relevant services you use. # Notify the T2B admins Without the correct DN, you will not be a...")
12:36, 8 July 2021 Admin talk contribs created page File:RSA-key-8192.png (Request forrm for GEANT IGTF-MICS Personal certificate 8192 RSA Private key)
12:36, 8 July 2021 Admin talk contribs uploaded File:RSA-key-8192.png (Request forrm for GEANT IGTF-MICS Personal certificate 8192 RSA Private key)
13:21, 6 April 2021 Admin talk contribs created page CephCrushMap (Created page with "* Look at the crush map: Either connect to the webinterface, or ceph osd crush dump * Add a new entry to a map type: ceph osd crush add-bucket sisc datacenter * Moving b...")
10:20, 6 April 2021 Admin talk contribs created page Mounting a RBD on a client machine (Created page with "This page describes one the very basic way to use a Ceph storage: you create a RBD pool in which you can create images, and these images can then be mounted on a client machin...")
09:27, 6 April 2021 Admin talk contribs deleted page DeployNewCluster (content was: "{{DISPLAYTITLE:Deploying a new Ceph Octopus cluster}} == Before you start == Very important remark if you reinstall a ceph cluster: make su...", and the only contributor was "Admin" (talk))
09:27, 6 April 2021 Admin talk contribs created page Deploying a new Ceph Octopus cluster (Created page with "== Before you start == Very important remark if you reinstall a ceph cluster: make sure to power off the nodes from a previous cluster deployment, otherwise the mon nodes will...")
09:13, 6 April 2021 Admin talk contribs created page DeployNewCluster (Created page with "{{DISPLAYTITLE:Deploying a new Ceph Octopus cluster}} Before you start")
10:20, 20 January 2021 Admin talk contribs created page Rucio (Created page with "This are basic instructions on rucio. Find the full info on: https://twiki.cern.ch/twiki/bin/view/CMSPublic/Rucio - You need to be on sl7 for the commands to work - initia...")
09:13, 2 October 2020 Admin talk contribs created page HTCFirstSubmissionGuide (Created page with "This is only a quick first draft for you to learn more on how to use HTCondor. === HTCondor Official Documentation === Have a look at the [https://htcondor.readthedocs.i...")
08:59, 2 October 2020 Admin talk contribs created page HTCondor (Created page with "! Please note that those pages are not intended to be what our Official Documentation will look like, but a rather a quick response to all your enthusiasm in using the new HTC...")
14:13, 10 September 2020 Admin talk contribs created page File:Firefox Import done.png
14:13, 10 September 2020 Admin talk contribs uploaded File:Firefox Import done.png
14:13, 10 September 2020 Admin talk contribs created page File:Firefox Import.png
14:13, 10 September 2020 Admin talk contribs uploaded File:Firefox Import.png
13:56, 10 September 2020 Admin talk contribs created page File:Firefox Certificate page.png
13:56, 10 September 2020 Admin talk contribs uploaded File:Firefox Certificate page.png
13:56, 10 September 2020 Admin talk contribs created page File:Download Certificate.png
13:56, 10 September 2020 Admin talk contribs uploaded File:Download Certificate.png
09:51, 10 September 2020 Admin talk contribs created page File:Choose IDP-institution.png
09:51, 10 September 2020 Admin talk contribs uploaded File:Choose IDP-institution.png
09:51, 10 September 2020 Admin talk contribs created page File:Geant-IGTF-MICS and RSA.png
09:51, 10 September 2020 Admin talk contribs uploaded File:Geant-IGTF-MICS and RSA.png

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