[sepia] Sepia Long Running Cluster mishap

Around 18JUN2020 0700 UTC, an errant `sudo rm -rf ceph` from the root directory on a senta unfortunately wiped out almost all data on the Ceph cluster in our upstream Sepia lab (AKA Long Running Cluster or LRC). Only teuthology job logs were preserved. I would guess because teuthology workers were actively writing jobs logs and files, the /teuthology-archive directory didn't get entirely wiped out. Here is a list of directories we lost: bz cephdrop (drop.ceph.com) cephfs-perf chacra (chacra.ceph.com) containers (quay.ceph.io) dgalloway diskprediction_config.txt doug-is-great el8 filedump.ceph.com firmware home.backup01 home.gitbuilder-archive job1.0.0 jspray.senta02.home.tar.gz old.repos post (files submitted using ceph-post-file) sftp (drop.ceph.com/qa) shaman signer (signed upstream release packages) tmp traces While I /did/ have backups of chacra.ceph.com binaries, the amount of data (> 1TB) backed up was too much to keep snapshots of. My daily backup script performs an `rsync --delete-delay` so if files are gone on the source, they get deleted from the backup. This is fine (and preferred) for backups we have snapshots of. However, the backup script ran *after* the errant `rm -rf` so unfortunately everything on chacra.ceph.com is gone. I have patched the backup script to *not* --delete-delay backups that we don't keep snapshots of. I restored the vagrant and valgrind chacra.ceph.com repos because I saw teuthology jobs failing because of those missing repos. Kefu also rebuilt and pushed ceph-libboost 1.72. (THANK YOU, KEFU!) We started using the quay.ceph.io registry (instead of quay.io) on June 17. Containers pushed to that registry were stored on the LRC as well so I had to delete the repo and start over this morning. Anything you see in the web UI should pull without issue: https://quay.ceph.io/repository/ceph-ci/ceph?tab=tags To prevent data loss in the future, Patrick graciously set up new filesystems and client credentials on the LRC. Because senta{02..04} are considered developer playgrounds, all users have sudo access. The sentas now mount /teuthology-archive read-only at /teuthology. If you need to unzip and inspect log files on a senta, you can do so in /scratch (another new filesystem on the LRC). It will likely take weeks of "where did X go" e-mails to mailing lists, job and build failures, bugs filed, IRC pings, etc. for me to find and restore everything that was used on a regular basis. I appreciate your patience and understanding in the meantime. Take care & be well, -- David Galloway Systems Administrator, RDU Ceph Engineering IRC: dgalloway