Hyper V how to increase hard disk && Unable to Edit hard disk due to check points

 https://www.zubairalexander.com/blog/how-to-expand-hard-drives-in-hyper-v-virtual-machines/

Expanding a Virtual Hard Disk in Hyper-V

Before you do anything else, you first need to shut down the virtual machine. Then you will expand the disk to increase its capacity.

1. Start Hyper-V and shutdown the VM that’s running out of disk space.
2. Once the VM is off, right-click the VM and select Settings.
3. Select the virtual hard disk that you want to expand and click Edit.
   NOTE: If Edit is grayed out then the VM is probably still running. Another reason that you may not be able to edit the hard disk is that you may have one or more checkpoints for the VM, in which case you will see an error Edit is not available because a checkpoint exists for this virtual machine. If you want to keep the changes in the checkpoint then merge the checkpoint by applying it, or to discard the changes simply delete the checkpoint and wait until the merge is complete then properly shutdown the VM. Do not use the Turn Of option in Hyper-V, use the Shut Down option.
   
4. When you edit the disk, a wizard will walk you through the steps. On the Choose Action screen select Expand.
5. On the next screen specify the size you want for the new disk, e.g. 300 GB and then click Finish. This will double the size of our drive C from about 150 GB to 300 GB.

Unable to Edit hard disk due to check points

https://community.spiceworks.com/topic/1326601-hyper-v-how-can-i-increase-hdd-size-on-an-existing-vm

delete checkpoints and snap shots

The issue is that your VM has 1 or more snapshots. You should not run a VM with snapshots for long periods of time; generally just a few days. Running snapshots in production is a very bad idea.

Hyper-v turn off vs shutdown

 Turn Off – Instantly *forcibly* turns off the virtual machine as if you had pulled the power plug (only use if VM is frozen) Shut Down – Same action as navigating inside the VM to Start > Shut Down. This gracefully initiates the shutdown procedure on the virtual machine's operating system.Apr. 16, 2018

Lost Power, Hyper-V unable to see VM after reconnect back to power

 1) Check if hyper-v is still there 

C/ProgramData/MicroSoft/Windows/Hyper-V/Virtual Machines

https://social.technet.microsoft.com/Forums/scriptcenter/en-US/38f7bf66-0a39-4905-90f8-c6900a4fdfd6/hyperv-guest-vms-disappeared-after-orderly-reboot-not-virus-scanning-issue?forum=winserverhyperv

2) Check hyper-v drive is still there

C:\Users\Public\Documents\Hyper-V\Virtual hard disks

https://community.spiceworks.com/topic/1070304-hyper-v-machines-disappears-after-restart-of-host-machine

3) 

    There are two ways

     a) In Hyper-V select Import Virtual machines, then sets the folder to C/ProgramData/MicroSoft/Windows/Hyper-V/Virtual Machines

           In there select restore

      b) Create a new virtual machine and point it to the virtual machine hard disk in  C:\Users\Public\Documents\Hyper-V\Virtual hard disks\<YourVirtualMachienHardDiskByDate>

Virtual Machine known host key does not match

 Probably due to DHCP server assigned the current host IP to a new machine

Solution: Change VM IP to static instead of DHCP(Optional) then go to /c/users/You/.ssh/known_host, delete current known host line for the machine, then redo ssh and get new known host key

Virtual Machine started but black screeen causes && solution

 Possible cause : "Not enough virtual memory"

Solution: "VM->settings->Memory->Increase Memory or use dynamic memory"

Detail cause: "

I am experiencing this issue, repeatedly and reproducibly, even with the latest version of Workstation 14 (i.e., 14.1.8).  I also have some idea regarding the cause: a resource exhaustion ostensibly related to a lack of virtual memory in Windows, but I actually have virtual memory disabled.  In my case, the Chrome browser, when I leave several tabs open for days or weeks on end (my research requires that), eventually something "breaks" in terms of VM resources in Windows, and the VMware display driver itself fails.  Occasionally, attempting to change the display mode (e.g., full, centered, or whatever) will bring the display back, but not usually.  Ordinarily, I am forced to either revert to a snapshot or reboot to get the display back.  So, this looks like a failure on the part of the SVGA 3D driver when the Chrome browser (in my case) exhausts some resource which it interprets as Windows' virtual memory.  As I said, I have now experienced this multiple times, and every time it comes down to Chrome and resource exhaustion, but the failing "component" is VMware's virtual display driver.  I do not know if this occurs under Workstation 15, as I am not using that due to the fact that it's claimed virtual hardware improvements (e.g., nvme drives) are mostly just sales hype (i.e., they are mostly false in practice)."

https://communities.vmware.com/thread/574041

LAMP on debian 8 jessie

PHP 7.2 on Debian

You can also install the Latest PHP version on your system. Run the following commands to install PHP 7.2 on Debian 8.

sudo apt update
sudo apt install php7.2

Also install required php modules.

sudo apt install php7.2-cli php7.2-common php7.2-curl php7.2-gd php7.2-json php7.2-mbstring php7.2-mysql php7.2-xml

https://tecadmin.net/install-php7-on-debian/


Install MYSQL on Debian

sudo apt-get install mysql-server

https://www.digitalocean.com/community/tutorials/how-to-install-linux-nginx-mysql-php-lemp-stack-in-ubuntu-16-04

A note about Debian/Ubuntu Linux systemd users

Use the following systemctl command on Debian Linux version 8.x+ or Ubuntu Linux version Ubuntu 15.04+ or above:
## Start command ##
systemctl start apache2.service
## Stop command ##
systemctl stop apache2.service
## Restart command ##
systemctl restart apache2.service

https://www.cyberciti.biz/faq/star-stop-restart-apache2-webserver/



Install Composer for PHP

Download the installer to the /tmp directory.

php -r "copy('https://getcomposer.org/installer', '/tmp/composer-setup.php');"

Visit Composer's pubkeys and signatures page and copy the SHA-384 string at the top . Then, run the following command by replacing sha_384_string with the string you copied.

php -r "if (hash_file('SHA384', '/tmp/composer-setup.php') === 'sha_384_string') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('/tmp/composer-setup.php'); } echo PHP_EOL;"

This command checks the hash of the file you downloaded with the correct hash from Composer's website. If it matches, it'll print Installer verified. If it doesn't match, it'll print Installer corrupt, in which case you should double check that you copied the SHA-384 string correctly.

Next, we will install Composer. To install it globally under /usr/local/bin, we'll use the --install-dirflag; --filename tells the installer the name of Composer's executable file. Here's how to do this in one command:

sudo php /tmp/composer-setup.php --install-dir=/usr/local/bin --filename=composer

https://www.digitalocean.com/community/tutorials/how-to-install-and-use-composer-on-debian-8



Git

Step 1 — Installing Git with APT

Before you install Git, make sure that your package lists are updated by executing the following command:

sudo apt-get update

Install Git with apt-get in one command:

sudo apt-get install git-core

https://www.digitalocean.com/community/tutorials/how-to-install-git-on-debian-8




Install Nodejs NPM using NVM (node -v > 6.0)

How To Install Using nvm

An alternative to installing Node.js through apt is to use a specially designed tool called nvm, which stands for "Node.js version manager". Using nvm, you can install multiple, self-contained versions of Node.js which will allow you to control your environment easier. It will give you on-demand access to the newest versions of Node.js, but will also allow you to target previous releases that your app may depend on.

To start off, we'll need to get the software packages from our Debian repositories that will allow us to build source packages. The nvm command will leverage these tools to build the necessary components:

sudo apt-get update

sudo apt-get install build-essential libssl-dev

Once the prerequisite packages are installed, you can pull down the nvm installation script from the project's GitHub page. The version number may be different, but in general, you can download it with curl:

curl -sL https://raw.githubusercontent.com/creationix/nvm/v0.32.0/install.sh -o install_nvm.sh

And inspect the installation script with nano:

nano install_nvm.sh

Run the script with bash:

bash install_nvm.sh

It will install the software into a subdirectory of your home directory at ~/.nvm. It will also add the necessary lines to your ~/.profile file to make the nvm command available.

To gain access to the nvm command and its functionality, you'll need to log out and log back in again, or you can source the ~/.profile file so that your current session knows about the changes:

source ~/.profile

Now that you have nvm installed, you can install isolated Node.js versions.

To find out the versions of Node.js that are available for installation, you can type:

nvm ls-remote

Output
...
         v6.8.0
         v6.8.1
         v6.9.0   (LTS: Boron)
         v6.9.1   (LTS: Boron)
         v6.9.2   (Latest LTS: Boron)
         v7.0.0
         v7.1.0
         v7.2.0

As you can see, the newest version at the time of this writing is v7.2.0, but v6.9.2 is the latest long-term support release. You can install that by typing:

nvm install 6.9.2

You'll see the following output:

Output
Computing checksum with sha256sum
Checksums matched!
Now using node v6.9.2 (npm v3.10.9)
Creating default alias: default -> 6.9.2 (-> v6.9.2)

Usually, nvm will switch to use the most recently installed version. You can explicitly tell nvm to use the version we just downloaded by typing:

nvm use 6.9.2

Install unzip:

apt-get install unzip

https://askubuntu.com/questions/86849/how-to-unzip-a-zip-file-from-the-terminal

Unistall node js:

sudo apt-get purge --auto-remove nodejs

https://askubuntu.com/questions/786015/how-to-remove-nodejs-from-ubuntu-16-04

You can use -R with chmod for recursive traversal of all files and subfolders.

You might need sudo as it depends on LAMP being installed by the current user or another one:

sudo chmod 755 -R /opt/lampp/htdocs

https://stackoverflow.com/questions/3740152/how-do-i-change-permissions-for-a-folder-and-all-of-its-subfolders-and-files-in?rq=1



chown - change ownership

Hyper-V on Windows

Hyper-v

Hyper-v needs to install an external switch