/run/

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Jan 26 16:23:34 SERVER systemd-logind[876]: Failed to save user data /run/systemd/users/0: No space left on device

See also

• tmpfs
• udev
• FHS, /proc/, /proc/net/, /boot/, /run/, /dev/, /usr/, /var/run/, /etc/, /var/, /var/lib/ /var/log/, /var/www/, /opt/, /lib/, /sys/, /proc/kcore, /proc/sys/, /proc/sys/vm/, /snap/, /mnt/, /mnt/data, /var/opt/, /usr/bin/, /lib/, /proc/$PID/, /proc/self/
• Systemd: systemctl, systemd-journald, journalctl systemd-cat, systemd-logind, systemd-networkd:networkctl, systemd-timesyncd, systemd-resolved, systemd-udevd , Systemd-logind: loginctl, hostnamectl, udevadm, systemd-run, portablectl, systemd-nspawn, systemd resource management, Timer (systemd), systemd logs, /etc/systemd/, systemd services, systemd-mount, /run/systemd/, .service, /usr/lib/systemd/, /usr/lib/systemd/system/, /usr/lib/systemd/system/systemd-resolved.service, /lib/systemd/, machinectl, systemd-oomd, systemd-analyze
• shm
• aide
• du, du -hs, Disk space usage, df, ls, tree, find, docker system df, journalctl --disk-usage, No space left on device, ENOSPC, sar -F, growpart, resize2fs, ncdu, duf, dua-cli

https://wiki.ubuntu.com/DebuggingSystemd