Limit process resources (cgroup) linux
Run a command in a transient systemd scope with resource limits
systemd-run --scope -p MemoryMax=512M -p CPUQuota=50% -- ./heavy.sh
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Query journald with time range
journalctl --since '2024-01-15 10:00' --until '2024-01-15 10:30' -u nginx
Export journald to JSON
journalctl -u <service> -o json | jq '{ts: .REALTIME_TIMESTAMP, msg: .MESSAGE}'
Show NTP sync status
timedatectl status && chronyc tracking
Check systemd timers
systemctl list-timers --all --no-pager
Copy SSH public key
ssh-copy-id -i ~/.ssh/id_ed25519.pub user@host