Tag Archives: WOL

Wake on LAN for PC’s via Raspberry Pi

Linux, Raspberry Pi, Raspberry Pi Server, , , , , , , ,

I found a nice PHP script for Wake on LAN. I loaded it on the Raspberry Pi that I have and configured it for my system. The Raspberry Pi runs 24/7, so I can just navigate to a web page that it serves, hit a button and start up one of my machines at home from anywhere. Mostly this is useful for the starting my Linux file server remotely but I do use it to fire off the desktop too.

Right from the read me file for the code…

REMOTE WAKE/SLEEP-ON-LAN SERVER
=========================
This is simple webapp that runs on your Raspberry Pi to turn it into a remotely accessible Wake/Sleep-On-LAN Server. [Follow the detailed tutorial](http://www.jeremyblum.com/2013/07/14/rpi-wol-server/) on my website for instructions on how to get this working, and forwarded through a router. This is very useful when you have high-powered machine that you don’t want to keep on all the time, but that you want to keep remotely accessible for Remote Desktop, SSH, FTP, etc.

http://www.jeremyblum.com/2013/07/14/rpi-wol-server/

Results

It is rare when something works right out of the box. But, this did, I followed Jeremy Blum’s instructions and within a few minutes I had this working. It has a nice drop-down menu where you can select a computer. It pings it to see if it is awake, then you can wake it from anywhere in the world. Once the WOL packet is sent, the application keeps pinging the PC at a defined interval and you can see when it wakes. I have not tried the sleep functionality as I am using it with Linux PC’s and his outline covers Windows machines. I am sure the code could me modified to shut down a Linux PC somehow. Perhaps it automatically SSH’s in and sends a shutdown command, something like that. I have my Linux server set to shutdown automatically so I don’t need this functionality myself.

It is configurable through an easily understood config.php file as well. You can set the computers name and IP address, MAC address, timing between pings, amount of times to ping the machine and etc.

Also see on this site…

Original Wake on LAN via Ubuntu Linux Post

Windows Wake on LAN Post

Backing up Windows User’s to Folders to a Linux File Server

Linux, Server, , , , , , , , , , ,
Robust File Copy for Windows

robocopy.exe available as part of rktools <-download page, can be used to copy files across the network to a Linux machine into a folder setup using Samba.

The DOS batch file below is called serverbackup.bat on my machine. It can start the Linux server using wolcmd <-download page, from Depicus.com and will copy a users folder to a folder on the server and creates a log file C:\tools\backup.log, then it shuts down the Windows PC with a 120 second delay. This delay is mostly there for testing. If the robocopy command goes belly up, the PC will try to jump right to the shutdown, which makes troubleshooting difficult. So leaving a delay is helpful as one can abort a shutdown by executing…

shutdown /a

…from the command line in Windows to stop the machine from shutting down.

I had to review how robocopy worked before deploying it in a backup script and I found an exact example of what I was looking for on Jacob Surland’s photography blog Caught in Pixels. I reviewed his post How to create a backup script using Robocopy before writing the serverbackup.bat script. I have the script downloadable here named serverbackup.bat, rename and modify as needed.

REM Wake Server, if it is already on, no harm done. It takes about 17 secs for server to start so REM robocopy will get an error and should keep retrying
REM run Depicus Wake on Lan from Command Line. Validated, Works!
 wolcmd yourmacaddr localserveripaddr 0.0.0.0 9
REM Copy User folder to \files\user on server via Samba links
 REM /MIR = purge files from dest. that do not exists in source
 REM /M Copy Archiveable files & reset attribute - not using this yet!!!
 REM /XA:SH exclude system and hidden important for user space
 REM /FFT fixes timing up for LINUX assumes FAT file times ( 2 sec granularity)
robocopy "C:\Documents and Settings\Erick_2" \\UBUNTUSERVER\Erick_Backup /MIR /XA:SH /XJ /FFT /W:1 /R:5 /LOG:C:\tools\backup.log
REM Shutdown PC when backups are done
shutdown -s -f -t 120

So far it works….

Resources

Windows Server 2003 Resource Kit Tools aka rktools

Depicus wolcmd download page

How to create a backup script using Robocopy

 

Wake On LAN via Ubuntu Linux

Linux, Server, , , , ,

Wake on LAN (WOL), works great, sometimes it is a bit tricky to configure. With Linux, the client that sends the magic packet requires etherwake and the unit to be waked requires ethtool to be installed. Ethtool configures the OS to actually boot on the Network Interface Card NIC’s command. The NIC has to support Wake on LAN and the BIOS has to be set up to use it.

Installing etherwake…

sudo aptitude install etherwake

Installing this package actually installs both etherwake and wakeonlan. To wake the computer….

wakeonlan MAC-Address-Here

or

etherwake MAC-Address-Here

MAC Address

MAC Address, aka Physical Address of a Linux machines NIC can be found by executing ifconfig. In Windows, you can use ipconfig /all.

 

Ethtool

Install…

sudo apt-get install ethtool

Use for eth0, enabling WOL…

sudo ethtool -s eth0 wol g

To check if the system is armed for WOL, run…

sudo ethtool eth0

Towards the bottom you should see

Supports wake on: g
Wake on : g

On my PC, I noticed that once it is waked. It is necessary to run…

sudo ethtool -s eth0 wol g

To re-arm the WOL, every time it is remote waked.

I will write a bash script to shutdown the server. It will execute…

sudo ethtool -s eth0 wol g
sudo shutdown -P now

Ensuring that when I power the server down remotely, it will be armed for WOL.

Better than that I found out by looking online while researching how to auto-suspend the server, this little piece…

Create “/etc/udev/rules.d/50-wol.rules” with the following contents:

ACTION=="add", SUBSYSTEM=="net", KERNEL=="eth*", RUN+="/usr/bin/ethtool -s %k wol g"

Check the syslog after creating it, errors will appear there if you spelled something wrong or whatnot.

tail /var/log/syslog

but as of now, no errors, but not setting wol g either. Still trouble shooting.

I found this piece at …

http://rolandtapken.de/blog/2013-07/suspend-nas-when-idle

The article talks about auto-suspending. But I found another article on auto-suspending that requires only a simple bash script that I have placed in /etc/cron.hourly but the article

https://bbs.archlinux.org/viewtopic.php?id=157268

does not give you the conf file, but it references another article in German

http://wiki.ubuntuusers.de/Skripte/AutoSuspend

that does have a conf file and it seems to work, at least it runs. I have yet to see if it actually will auto-suspend! I am working on it right now and will post an entire write up when the bugs are worked out.

 

Remote vs Local

The first try most likely be on your own LAN. To do it for real remotely requires setting up your router to forward ports. I had to set it to forward port 7 and 9 to the outside world. Then it is a matter of sending a magic packet to the ISP address that your router reports of a FQDN ( Fully Qualified Domain Name), remotely I had to have the bit mask set to 255.255.255.255 when using a utility on a website. Locally I noticed 0.0.0.0 ( broadcast ) worked.

 

I read a bit about WOL here before attempting to set it up.