====== Boot - Shutdown ======
===== Lab PCs (with network boot) =====

  * **Shutdown/Restart** : 
    * **(Normal)** : We press ''**CTRL-ALT-DEL**''. //Initial Linux login screen// is displayed. From **Options** on the bottom left, we select **Shutdown** or **Restart**. This will shutdown or restart local PC.
    * **(Abnormal)** : In **case of problem** we can poweroff **abnormally** from **power** button. No data will be lost since nothing is stored on the local PC.

  
===== Virtual Machines =====

  * **Shutdown**
    - If we want to shutdown virtual machines without shutting down server PC then [[en:quickstart:connect2server|we connect to Server HY to proxmox]] 
      * **Warning!** __We do not connect from a PC that was booted from network__ because our login session is running on the virtual machines we want to shutdown and we will lose connection. We connect either from a **PC with local installation and local user** or from Server PC itself.
    - On the left pane we select **Datacenter** and double click on **hosta**. We can see here the running virtual machines.
    - To **shutdown** a virtual machine we have 3 ways.
      - **(Normal shutdown)**. We right click on the virtual machine and select **Shutdown**.  What this does to a virtual machine is equivalent to pressing power button for a second only on a normal PC to send a shutdown command.
      - **(Normal shutdown)**. If above procedure doesn't work, we right click on it, select **Console** to open a VNC Console and do a shutdown **from within the OS** of the virtual machine.
      - **(Abnormal shutdown)**. To shutdown abnormally (poweroff) a virtual machine, if for example it has frozen, we click on **Stop** button. What this does to a virtual machine is equivalent to pressing power button on a normal PC for many seconds until it cuts power. **Reset** button on a virtual machine is equivalent to reset button on a normal PC.
  * **Boot** 
    * Το **boot** a virtual machine We right click on the virtual machine and select **Start** or we left click to select it and click on the Start button in the up right.

<note>Server vm - **lserver** boots always **first** and after it finishes booting, the rest vms start. With similar logic it is the **last** vm to shut down after all other vms have stopped</note>


===== Server PC =====

  * **Boot**
    * **Locally** : We start Server PC normally by pressing **power** button. It is configured to start all virtual machines automatically in the correct order. 
  * **Shutdown**
    * **Locally** : We can safely give **shutdown command even from power button** by pressing it lightly for a second. Server will shutdown virtual machines in the right order and then shutdown itself.
    * **Remotely** : [[en:quickstart:connect2server|We connect to Server PC to proxmox]], select **hosta** and from the button on the up row we click on **Shutdown** 
  * **Restart**
    * **Remotely** : [[en:quickstart:connect2server|We connect to Server PC to proxmox]], select **hosta** and from the button on the up row we click on **Restart** 

<note tip>If possible, it is recommended to __shutdown virtual machines__ **before shutting down or restart Server PC**. Virtual machines can be automatically shutdown from Server PC when it shuts down or reboot, however it may fail to gracefully shutdown the vms and shut them down abnormally after 2 minutes risking data loss.</note>