= Raspberry Service designen =

Am Beispiel von WPA-Ping (wird von mir '''NICHT genutzt''')

Das Script sieht so aus:

{{{
cat >> /usr/local/bin/wpaping << "EOFWPA"
#!/bin/bash
#
# Loop forever doing wpa_cli SCAN commands
#

sleeptime=120  # number of seconds to sleep. 2 minutes (120 seconds) is a good value

while [ 1 ];
do
    wpa_cli -i wlan0 scan
    sleep $sleeptime
done

EOFWPA
}}}

Der Service selber wird so gestaltet:

{{{
cat >> /lib/systemd/system/wpaping.service << "EOFWPA"
[Unit]
Description=WPA Supplicant pinger
Requires=network-online.target

[Service]
ExecStart=/usr/local/bin/wpaping
User=root
StandardInput=null
StandardOutput=null
StandardError=null
Restart=on-failure

[Install]
WantedBy=multi-user.target

EOFWPA
}}}

Um den Service dauerhaft zu starten, einfach den Standard-Weg beschreiten:

{{{
systemctl daemon-reload; systemctl enable wpaping.service; systemctl start wpaping.service
}}}

Runlevel herausfinden:

{{{
runlevel
}}}

Eigener Versuch:
{{{
[Unit]
Description=Sync Logfiles between SD Card and ramdisk
Requires=var-log.mount
DefaultDependencies=no
After=local-fs.target
Before=basic.target
Conflicts=umount.target

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/home/hss/scripts/rsync-log-files-boot.sh
ExecStop=/home/hss/scripts/rsync-log-files-shutdown.sh
User=root

[Install]
WantedBy=multi-user.target

}}}

Script:
{{{
#!highlight bash
#!/bin/bash
### BEGIN INIT INFO
# Provides:          varlog
# Required-Start:    $local_fs
# Required-Stop:     $local_fs
# X-Start-Before:    $syslog
# X-Stop-After:      $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start/stop tmpfs logfile saving and restore.
### END INIT INFO
#
# Increases overall system performance.
# Increases the life of your SDcard by reducing filesystem IO (read/writes).
#
PATH=/sbin:/usr/sbin:/bin:/usr/bin


varlogSave=/var/save.log/
[ ! -d $varlogSave ] && mkdir -p $varlogSave


function _save() {
    if [ -x "$(which rsync)" ]; then
        rsync -a --delete /var/log/ ${varlogSave}
    else
        cp -Rpu "/var/log/*" $varlogSave
    fi
    sync
}


case $1 in
    start)
        echo "*** Starting tmpfs file restore: varlog."
        if [ -z "$(grep /var/log /proc/mounts)" ]; then
            echo "*** mounting /var/log"
            _save
            varlogsize=$(grep /var/log /etc/fstab|awk {'print $4'}|cut -d"=" -f2)
            [ -z "$varlogsize" ] && varlogsize="70M"
            mount -t tmpfs tmpfs /var/log -o defaults,size=$varlogsize
            chmod 775 /var/log
        fi
        cp -Rpu ${varlogSave}* /var/log/
    ;;
    stop)
        echo "*** Stopping tmpfs file saving: varlog."
        _save
        umount -f /var/log/
    ;;
    *)
        echo "Usage: $0 {start|stop}"
        exit 1
    ;;
esac


exit 0
[/php]


Ein weiterer Gedanke wäre noch einen Schritt weiter zu gehen  und im "start" Abschnitt die letzte Zeile wie folgt abzuändern:
[code]
cp -Rp --attributes-only ${varlogSave}* /var/log/
}}}

----
KategorieRaspberry