CCU GPU clusterCollective Computational Unit (CCU), Universität Konstanz

2026-11-08 · The wiki is read-only and will be switched off on 31 March 2027. The old CCU wiki has been read-only since 8 November 2026 and will be switched off on 31 March 2027. Everything current about the cluster is in the documentation. If you still rely on a page that exists only in the wiki, tell us at ccu@uni-konstanz.de before March so it can move here. More

2026-11-07 · Automatic cleanup of finished pods from 13 November. From Friday, 13 November, finished pods and Jobs in user namespaces are deleted automatically 7 days after they ended (failed ones after 14 days), and pods stuck in a crash loop or an image pull error after 2 days. Their logs are deleted with them, so save whatever you still need from old pods before then. Files in your home directory and on volumes are not affected. More

2026-11-07 · Mails about idle GPUs from 13 November. From Friday, 13 November, you get a mail when a pod of yours holds a GPU that has been idle for 4 hours. Nothing is deleted yet: the mails help us find workloads that need an exception (model servers, demos and the like), so tell us if yours is one. Deleting pods with idle GPUs follows later and will be announced. More

2026-11-04 · belial and fierna maintenance complete. The nodes Fierna and Belial were critically short on ephemeral storage, so I needed to reconfigure some paths to the local raid. Unfortunately, this required draining the nodes of all pods first, so computations were interrupted. Pods under a controller (e.g. a Job) restarted after the maintenance windows was over. I also used this opportunity for system upgrades on the two nodes.

2026-11-03 · kubeconfig update, fewer logins. If kubectl sends you to the browser login every day, your kubeconfig is from before this date: download kubeconfig-ccu.yaml again (or add `--oidc-extra-scope=offline_access` to its args) and log in once. Afterwards the login is renewed silently and only comes back after 30 days without use. More

2026-10-22 · New documentation site. The cluster documentation moved from the wiki to this site. The quick start describes the current login (kubectl oidc-login). Feedback to ccu@uni-konstanz.de. More

2026-10-20 · Christmas maintenance window. The cluster will be down for updates between Christmas and New Year. Exact dates follow by mail; plan long training runs accordingly and keep checkpoints.