シャットダウン時の後処理 （shutdown）

# vi /etc/systemd/system/drop.service
[Unit]
Description= stop httpgwd

DefaultDependencies=no
Before=shutdown.target
RefuseManualStart=true

[Service]
Type=oneshot
ExecStart= /usr/local/sbin/httpgwd  stop
[Install]
WantedBy=shutdown.target

# systemctl daemon-reload

# systemctl enable drop.service

#---------------------------- socat -----------------------------

# dnf install socat

vi /etc/systemd/system/lpr-proxy.service <<__EOF__

[Unit]

Description=LPR Proxy Server

After=network.target

[Service]

ExecStart=/usr/bin/socat TCP4-LISTEN:515,fork TCP4:192.168.1.200:515

Restart=always

User=nobody

Group=nobody

[Install]

WantedBy=multi-user.target

__EOF__

sudo systemctl daemon-reload

sudo systemctl enable --now lpr-proxy