In an effort to reduce power consumption, I’ve moved most systems I use regularly onto a pair of virtual servers, enabling me to keep many machines off most of the time, except for occasional use.\u00a0 There are still a few physical machines, and I do prefer to have current backups of everything, so I decided to use the wake-on-LAN protocol, which seems to work for most modern computers hard-wired to ethernet (on the same segment.)<\/p>\n
I started with this post<\/a> by Salik Rafiq, but my first problem was that I didn’t want to turn every machine on, back it up, and then just leave it on.\u00a0 Nor did I particularly want to turn every machine off after being backed up, since it’s not unusual for a machine to be backed up while I’m actually using it for something.\u00a0 The obvious solution is to store whether or not a machine is actually on, then return it to that state afterward.<\/p>\n I made a few other changes, which I’ll briefly outline:<\/p>\n As with Salik’s original script, this replaces the “ping” command for BackupPC, and is reasonable to use with every machine, whether or not it supports wake-on-lan.<\/p>\n To turn the machines back on, I updated my postcmd.sh script (see this post<\/a> for details) to look up the machine state, and if it was off before, turn it off now:<\/p>\n Although it only recognizes “on” and “off” as valid machine states (it doesn’t detect nor return a system to hibernated, sleeping, etc. states) it at least takes care of the simple function of turning machines on, backing them up, then turning them back off.<\/p>\n For systems that don’t support wake-on-lan, like those connected through wireless, I’m considering using X10.<\/p>\n","protected":false},"excerpt":{"rendered":" In an effort to reduce power consumption, I’ve moved most systems I use regularly onto a pair of virtual servers, enabling me to keep many machines off most of the time, except for occasional use.\u00a0 There are still a few physical machines, and I do prefer to have current backups \u2026 Continue reading \n
, so I lazily hacked in arguments 3 and 4.\u00a0 (There are much more elegant ways to do this.)<\/del> so this script assumes that the last argument is the machine name.<\/li>\nNote that I use the hardcoded directory “\/usr\/tools\/wol” for both hardware and state information.<\/del>\u00a0 The $WOLDIR directory is used for hardware and state information.<\/li>\n<\/ul>\n#!\/bin\/bash\r\n\r\n#this script is totally designed for the backuppc ping command\r\n#which is the first thing it does before it starts a backup\r\n#this is a substitute which pings the machine, if it is not\r\n#awake then it wakes it using a magic packet - using the wol.bsh script\r\n#then pings again to make sure\r\n\r\nPING=\/bin\/ping\r\nargnum=$(($#-1))\r\nARGS=${@:1:$argnum}\r\nWAKEHOST=\"${!#}\"\r\nETHWAKE=\/usr\/bin\/wakeonlan\r\nWOLDIR=\/usr\/tools\/wol\r\nSLEEPTIME=3m\r\n\r\nlogger \"Backuppc pinging $ARGS $WAKEHOST\"\r\n\r\nfunction getwol {\r\n\tif [ -f $WOLDIR\/$1.wol ]; then\r\n\t hwaddr=$(cat $WOLDIR\/$1.wol | cut -d\" \" -f4)\r\n\telse\r\n\t logger \"No MAC address for $1\"\r\n\t exit -1\r\n\tfi\r\n}\r\n\r\nfunction fwol {\r\n TO_WAKEUP=$1\r\n\tgetwol $1\r\n sudo $ETHWAKE $hwaddr\r\n}\r\n\r\n$PING $ARGS $WAKEHOST >>\/dev\/null 2>&1\r\n\r\nif [ $? -ne 0 ]; then\r\n fwol $WAKEHOST\r\n if [ \"$WOL_RES\" = \"FAIL\" ]; then\r\n exit 1\r\n fi\r\n\techo \"OFF\" > $WOLDIR\/$WAKEHOST.state\r\n sleep $SLEEPTIME\r\n $PING $ARGS $WAKEHOST\r\n if [ $? -eq 0 ]\r\n then\r\n logger \"success waking $WAKEHOST.\"\r\n else\r\n logger \"unable to wake $WAKEHOST.\"\r\n exit 1\r\n fi\r\nelse\r\n $PING $ARGS $WAKEHOST\r\n echo \"ON\" > $WOLDIR\/$WAKEHOST.state\r\nfi\r\n\r\nexit 0<\/pre>\n#!\/bin\/bash\r\nWINEXE=\/usr\/bin\/winexe\r\nUNAME=\"Username\"\r\nPWD=\"Password\"\r\nWRKGRP=\"WORKGROUP\"\r\nBOX=$1\r\nPID=$($WINEXE -U $UNAME -W $WRKGRP --password=$PWD \/\/$BOX 'cmd \/c echo '1'\r\n> c:\\backuppc\\wake.up')<\/span>\r\necho \"Rsync and shadow copy unloaded\"\r\nif [ -f \/usr\/tools\/wol\/$BOX.state ]; then\r\n read wasoff < \/usr\/tools\/wol\/$BOX.state\r\n if [ \"$wasoff\" = \"OFF\" ]; then\r\n $WINEXE -U $UNAME --password=$PWD \/\/$BOX 'shutdown -f -s -c \"Backup\r\nComplete\"'\r\n fi\r\nfi<\/pre>\n