# EESSI webinar series (May 2025) - Introduction to CernVM-FS

- Mon 12 May 2025, 13:30-15:30 CEST
- part 2 of 5, see https://www.eessi.io/docs/training/2025/webinar-series-2025Q2
- update + condensed version of:
- CernVM-FS tutorial: https://multixscale.github.io/cvmfs-tutorial-hpc-best-practices
- Valentin's EUM'25 talk: https://users.ugent.be/~kehoste/eum25/031_eum25_CernVM-FS.pdf

## Sync meeting 2025-04-30

- outline OK
- TODO Valentin: promote session in CernVM-FS community
- copy over https://multixscale.github.io/cvmfs-tutorial-hpc-best-practices/ into EESSI docs + revise
- in parallel with working on the slides

## Sync meeting 2025-04-10

### Attendees

- Kenneth (HPC-UGent)
- Valentin, Laura, Georgios (CERN)
- Bob (UGroningen)
- Thomas

### Practical

- Zoom webinar + Q&A via Slack
- 1.5h of content/demo + 30min Q&A
- contents
- slides + updated tutorial website
- slides in Google Slides: https://docs.google.com/presentation/d/1EzolhageFlojUvQlKViGYt2_7eWjYr6Wnbsdl8dKYpU
- https://www.eessi.io/docs/tutorials/cvmfs/may-2025
- speakers:
- Valentin
- Kenneth
- moderators:
- Thomas
- Georgios
- helping with preparing contents:
- Bob
- Thomas
- Georgios
- Laura
- next meeting
- Wed 30 April'25 16:00-17:00 CEST
- full draft + check time for outline
- scenario for demos prepare
- Fri 9 May'25 14:00-15:00 CEST
- camera-ready + final feedback
- Mon 12 May'25 10:00-11:00 CEST
- last-minute prep

### Outline

~1.5h contents

● [Valentin] (15min) Introduction to CernVM-FS
- slide 3-10 from EUM'25 talk
- single slide on flagship repositories
● [Kenneth] (5min) short intro/reminder of EESSI (incl. hands-on demo)
● [Kenneth] (10min) CernVM-FS client installation + configuration (incl. hands-on demo)
● [Kenneth] (15min) CernVM-FS on large-scale systems: need for Stratum-1 + proxy (incl. hands-on)
● [Valentin] (10min) diskless/offline nodes + alternative access mechanisms: cvmfsexec, shrinkwrap/squashfs, container
- [Kenneth] hands-on with cvmfsexec (on MeluXina)
● [Valentin] (10min) monitoring CernVM-FS (clients, Stratum-1, proxies, Stratum-0)
● [Valentin] (10min) troubleshooting CernVM-FS
- translation of error messages
- `Transport endpoint not connected` -> `cvmfs2` process died
- `Too many levels of symbolic links`
● [Kenneth] (10min) creating CernVM-FS repo from scratch (Stratum-0), incl. quick hands-on demo?
● [Kenneth] (10min) software startup performance
- results from EuroHPC systems?

● (25min) Q&A