PingFleet Community Tutorials and explainers on running your own infrastructure. https://pingfleet.net/community/ 2026-09-20T00:00:00Z Alert before the disk fills, not after the database dies https://pingfleet.net/community/disk-alert-before-it-fills/ 2026-09-20T00:00:00Z At 23% used the disk had four hours left Revoke an SSH key from ten servers without Ansible https://pingfleet.net/community/revoke-ssh-key-everywhere/ 2026-09-20T00:00:00Z grep -v exits 1 when it removes every line from a file SSH drops when idle and ServerAliveInterval does not help https://pingfleet.net/community/ssh-drops-after-thirty-seconds/ 2026-09-20T00:00:00Z ClientAliveInterval 30 did not drop a single idle session Prove your MongoDB backup by restoring it every night https://pingfleet.net/community/mongodump-restore-proven/ 2026-09-06T00:00:00Z mongodump exits 0 on a database that does not exist Set up an SSH jump host so private servers stay private https://pingfleet.net/community/ssh-jump-host/ 2026-09-06T00:00:00Z ssh -i key -J bastion silently ignores -i on the jump systemd says active and nothing is listening on the port https://pingfleet.net/community/systemd-active-nothing-listening/ 2026-09-06T00:00:00Z Three of four units said active with nothing listening Build a dead-man switch so silent cron failures alert you https://pingfleet.net/community/cron-that-tells-you-it-stopped/ 2026-08-26T00:00:00Z A removed crontab entry produces zero log lines LXC vs VM on Proxmox, and where the two really differ https://pingfleet.net/community/lxc-or-vm-measured/ 2026-08-26T00:00:00Z An idle LXC holds 85 MiB; the VM beside it, 347 Fix Nginx 502 when the upstream is already listening https://pingfleet.net/community/nginx-502-upstream-running/ 2026-08-26T00:00:00Z Four 502s and one 504, each a different log line