Ubuntu 21.04
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Vagrant : Install2021/05/21

Install Vagrant that is wrapper tool for Virtualization software like VirtualBox or others.
Vagrant supports many Virtualization software like VirtualBox or KVM and others, this example is based on the VirtualBox installed environment.
[1] Install Vagrant.
apt -y install vagrant
[2] Basic usage of Vagrant.
# download and add virtual machine images

# for downloadable image, refer to the official site below

# ⇒ https://app.vagrantup.com/boxes/search

vagrant box add ubuntu/hirsute64

==> box: Loading metadata for box 'ubuntu/hirsute64'
    box: URL: https://vagrantcloud.com/ubuntu/hirsute64
==> box: Adding box 'ubuntu/hirsute64' (v20210514.0.0) for provider: virtualbox
    box: Downloading: https://vagrantcloud.com/ubuntu/boxes/hirsute64/versions/20210514.0.0/providers/virtualbox.box
Download redirected to host: cloud-images.ubuntu.com
==> box: Successfully added box 'ubuntu/hirsute64' (v20210514.0.0) for 'virtualbox'!

# initialize ([Vagrantfile] is created on the current path)

vagrant init ubuntu/hirsute64

A `Vagrantfile` has been placed in this directory. You are now
ready to `vagrant up` your first virtual environment! Please read
the comments in the Vagrantfile as well as documentation on
`vagrantup.com` for more information on using Vagrant.

# start virtual machine

vagrant up

Bringing machine 'default' up with 'virtualbox' provider...
==> default: Importing base box 'ubuntu/hirsute64'...
==> default: Matching MAC address for NAT networking...
==> default: Checking if box 'ubuntu/hirsute64' version '20210514.0.0' is up to date...
==> default: Setting the name of the VM: root_default_1621567216486_2955
Vagrant is currently configured to create VirtualBox synced folders with
the `SharedFoldersEnableSymlinksCreate` option enabled. If the Vagrant
guest is not trusted, you may want to disable this option. For more
information on this option, please refer to the VirtualBox manual:


This option can be disabled globally with an environment variable:


or on a per folder basis within the Vagrantfile:

  config.vm.synced_folder '/host/path', '/guest/path', SharedFoldersEnableSymlinksCreate: false
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
    default: Adapter 1: nat
==> default: Forwarding ports...
    default: 22 (guest) => 2222 (host) (adapter 1)
==> default: Running 'pre-boot' VM customizations...
==> default: Booting VM...
==> default: Waiting for machine to boot. This may take a few minutes...
    default: SSH address:
    default: SSH username: vagrant
    default: SSH auth method: private key
    default: Warning: Connection reset. Retrying...
    default: Vagrant insecure key detected. Vagrant will automatically replace
    default: this with a newly generated keypair for better security.
    default: Inserting generated public key within guest...
    default: Removing insecure key from the guest if it's present...
    default: Key inserted! Disconnecting and reconnecting using new SSH key...
==> default: Machine booted and ready!
==> default: Checking for guest additions in VM...
    default: The guest additions on this VM do not match the installed version of
    default: VirtualBox! In most cases this is fine, but in rare cases it can
    default: prevent things such as shared folders from working properly. If you see
    default: shared folder errors, please make sure the guest additions within the
    default: virtual machine match the version of VirtualBox you have installed on
    default: your host and reload your VM.
    default: Guest Additions Version: 6.0.0 r127566
    default: VirtualBox Version: 6.1
==> default: Mounting shared folders...
    default: /vagrant => /root

# show state of virtual machine

vagrant status

Current machine states:

default                   running (virtualbox)

The VM is running. To stop this VM, you can run `vagrant halt` to
shut it down forcefully, or you can run `vagrant suspend` to simply
suspend the virtual machine. In either case, to restart it again,
simply run `vagrant up`.

# connect to virtual machine with SSH

vagrant ssh

Welcome to Ubuntu 21.04 (GNU/Linux 5.11.0-17-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  System information as of Fri May 21 03:22:14 UTC 2021

  System load:  0.28              Processes:               108
  Usage of /:   3.3% of 38.71GB   Users logged in:         0
  Memory usage: 18%               IPv4 address for enp0s3:
  Swap usage:   0%

vagrant@ubuntu-hirsute:~$ exit 

# stop virtual machine

vagrant halt

==> default: Attempting graceful shutdown of VM...
# if you'd like to change settings of virtual machine, edit Vagrantfile

vi Vagrantfile
# for example to change CPU and Memory settings

# uncomment line 57 like follows and add or change values

  config.vm.provider "virtualbox" do |vb|
  #   # Display the VirtualBox GUI when booting the machine
  #   vb.gui = true
  #   # Customize the amount of memory on the VM:
     vb.memory = "4096"
     vb.cpus = 2
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