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:

   1 #!/bin/bash
   2 ### BEGIN INIT INFO
   3 # Provides:          varlog
   4 # Required-Start:    $local_fs
   5 # Required-Stop:     $local_fs
   6 # X-Start-Before:    $syslog
   7 # X-Stop-After:      $syslog
   8 # Default-Start:     2 3 4 5
   9 # Default-Stop:      0 1 6
  10 # Short-Description: Start/stop tmpfs logfile saving and restore.
  11 ### END INIT INFO
  12 #
  13 # Increases overall system performance.
  14 # Increases the life of your SDcard by reducing filesystem IO (read/writes).
  15 #
  16 PATH=/sbin:/usr/sbin:/bin:/usr/bin
  17 
  18 
  19 varlogSave=/var/save.log/
  20 [ ! -d $varlogSave ] && mkdir -p $varlogSave
  21 
  22 
  23 function _save() {
  24     if [ -x "$(which rsync)" ]; then
  25         rsync -a --delete /var/log/ ${varlogSave}
  26     else
  27         cp -Rpu "/var/log/*" $varlogSave
  28     fi
  29     sync
  30 }
  31 
  32 
  33 case $1 in
  34     start)
  35         echo "*** Starting tmpfs file restore: varlog."
  36         if [ -z "$(grep /var/log /proc/mounts)" ]; then
  37             echo "*** mounting /var/log"
  38             _save
  39             varlogsize=$(grep /var/log /etc/fstab|awk {'print $4'}|cut -d"=" -f2)
  40             [ -z "$varlogsize" ] && varlogsize="70M"
  41             mount -t tmpfs tmpfs /var/log -o defaults,size=$varlogsize
  42             chmod 775 /var/log
  43         fi
  44         cp -Rpu ${varlogSave}* /var/log/
  45     ;;
  46     stop)
  47         echo "*** Stopping tmpfs file saving: varlog."
  48         _save
  49         umount -f /var/log/
  50     ;;
  51     *)
  52         echo "Usage: $0 {start|stop}"
  53         exit 1
  54     ;;
  55 esac
  56 
  57 
  58 exit 0
  59 [/php]
  60 
  61 
  62 Ein weiterer Gedanke wäre noch einen Schritt weiter zu gehen  und im "start" Abschnitt die letzte Zeile wie folgt abzuändern:
  63 [code]
  64 cp -Rp --attributes-only ${varlogSave}* /var/log/

KategorieRaspberry