#create Unit
systemctl edit --full --force vmstatd.service

#systemd-nspawn
systemd-nspawn -D /var/lib/machine/rocky7 -b

machinectl str+altGr+9 

/var/lib/machines/rocky7

[Unit]
Description=vmstat as daemon

[Service]
Type=simple
ExecStart=/usr/bin/vmstat $VMSTAT_OPTS 3
EnvironmentFile=-/etc/default/vmstatd
StandardOutput=append:/var/log/vmstat.log

/etc/default/vmstatd
VMSTAT_OPTS=-ntw
VMSTAT_DELAY=3
VMSTAT_LOG=/var/log/vmstat.log