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       Using Wake On Lan so you don't have to use your fingers
       
       Published on : 2025-03-14 14:52
       
       WakeOnLan is a very useful feature, especially if you're a lazy 
       person. With WakeOnLan you can start your machines without walking 
       or using your fingers and push the power button.
       
   IMG  A photo of how I wake up my cluster
       
        - What you need
       
       You only need 2 things: wakeonlan and ethtool. You can easily 
       install them with:
       
           sudo apt install wakeonlan ethtool
       
       wakeonlan is needed on the machine you'll be using to send the 
       wake up command while ethtool is used to configure your network 
       card. 
       
        - Using ethtool to enable Wake-on-LAN
       
        - + Find the Network Adapter (in my case it's `enp1s0`)
       
           ip a
       
        - + Check if WakeOnLan is supported
       
           sudo ethtool enp1s0 | grep "Wake-on"
       
       You should see something like ` Supports Wake-on: pumbg`. 
       To enable WakeOnLan you have to:
       
           sudo ethtool --change enp1s0 wol g
       
       Right now WakeOnLan is enabled but the setting is not persistent. 
       
        - + Persist Wake-on-LAN After Reboot
       
           sudo pico /etc/systemd/system/wol.service
       
       Add the following and replace `enp1s0` with your network card
       
           [Unit]
           Description=Enable Wake On Lan
       
           [Service]
           Type=oneshot
           ExecStart = /usr/sbin/ethtool --change enp1s0 wol g
       
           [Install]
           WantedBy=basic.target
       
       
        - + Enable the service:
           sudo systemctl enable wol.service
       
        - Using wakeonlan to start your computers
       
       In order to wake up your computers with a magic wakeonlan packet 
       you need to know it's MAC address. You can easily find it with 
       
           sudo ethtool -P enp1s0
       
       Once you get the MAC address you can easily wake the computer up 
       from another computer using the wakeonlan command:
       
           wakeonlan "D2:CB:3B:20:DC:AE"
       
       I have create a small bash script to wake up all my 3 Lenovo M53's 
       at once:
       
           #!/bin/bash
       
           # MAC addresses (Not the real ones)
           MAC1="D2:CB:3B:20:DC:AE" # lenovo1 mac
           MAC2="D2:CB:3B:20:DD:37" # lenovo2 mac
           MAC3="D2:CB:3B:20:D6:04" # lenovo3 mac
       
           # Wake up the three computers
           echo "Waking up lenovo1 ..."
           wakeonlan $MAC1
       
           echo "Waking up lenovo2 ..."
           wakeonlan $MAC2
       
           echo "Waking up lenovo3 ..."
           wakeonlan $MAC3
       
           echo "All computers should be waking up now."
       
       
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