The Art of Strange Code

I am Maic, software developer in Berlin.

Archlinux/Raspberry Pi - Systemd create a service unit

Mo 30 März 2015

General example

/etc/systemd/system/testunit.service
[Unit]
Description=Start Pi Router
[Install]
WantedBy=multi-user.target
[Service]
Type=simple
ExecStart=/sbin/testscript.sh start
ExecStop=/sbin/testscript.sh stop
/sbin/testscript.sh
#!/bin/sh

echo $(date "+%Y.%m.%d-%H.%M.%S") $*>>/var/log/test_tmp.log
/sbin/testscript2.sh
#!/bin/sh

echo $(date "+%Y.%m.%d-%H.%M.%S") $*>>/var/log/test_tmp.log

Example script for starting access point & PPP & NAT:

/etc/systemd/system/pirouter.service
[Unit]
Description=Start Pi Router
[Install]
WantedBy=multi-user.target
[Service]
Type=simple
ExecStart=/sbin/testscript.sh start
ExecStop=/sbin/testscript.sh stop

Download: pirouter.service

/sbin/testscript.sh
#!/bin/sh
#=== Start Function ===
function start {
    echo "Starte AP..."
    hostapd -B /etc/hostapd/hostapd.conf
    echo "ERROR-CODE: $?"
    echo "Vergebe IP an wlan0 interface"
    ip addr add 192.168.0.1/16 dev wlan0
    echo "ERROR-CODE: $?"
    sleep 5
    echo "Starte DHCP Server..."
    dnsmasq
    echo "ERROR-CODE: $?"
    sleep 5
    echo "Aktiviere ip_forward..."
    echo 1 > /proc/sys/net/ipv4/ip_forward
    echo "ERROR-CODE: $?"
    echo "Aktiviere IPTables Nat Routing..."
    iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
    echo "ERROR-CODE: $?"
    echo "USB_modeswitch for usb device..."
    usb_modeswitch -c /etc/usb_modeswitch.d/1c9e:f000
    echo "ERROR-CODE: $?"
    echo "Start ppp Connection..."
    sakis3g --sudo  "connect" OTHER="USBMODEM" USBMODEM="1c9e:9605" APN="surfo2" SIM_PIN="PINCODE"
    echo "ERROR-CODE: $?"
    echo "pirouter started"
    exit 0
}
#=== Stop Function ===
function stop {
    echo "Stop DNS Server..."
    sudo killall dnsmasq
    echo "Stop AP..."
    sudo killall hostapd
    echo "Disconnect ppp Connection..."
    sakis3g --sudo "disconnect"
    exit 0
}
#=== MAIN ===
#echo $(date "+%Y.%m.%d-%H.%M.%S") $*>>/var/log/test_tmp.log
echo "Execute piroute.sh $*"
case $1 in
  start) start ;;
  stop) stop ;;
  *) echo "Unbekanntes Kommando $1" ;;
esac
exit 0

Download: pirouter.sh

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