• Ubuntu Server is familiar with most of developers to run test or try/quick-start new feature, tools, etc.

• Specific usecases are kubernetes (k8s) cluster, postgresql database servers with master and standby ones, try cassandra, etc.

• Using vagrant for quick start and this is how to setup basic Ubuntu server
  

  1. Create Vagrantfile file

• User ubuntu version 20.04

  • Checkout the box version in generic/ubuntu2004
  • Box version needs to support libvirt Hosted by Vagrant Cloud (1.4 GB)
  • eg. generic/ubuntu2004:3.1.16 ```

Vagrant.configure("2") do |config|
config.vm.box = "generic/ubuntu2004"
config.vm.box_version = "3.1.16"
end

- Library virtual driver is virtual box or KVM (Kernel-based Virtual Machine), here is KVM
- Using `bootstrap.sh` for installing necessary software

-- mode: ruby --

vi: set ft=ruby :

VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
config.vm.provider :libvirt do |libvirt|
libvirt.driver = "kvm"
end
config.vm.box = "generic/ubuntu2004"
config.vm.box_version = "3.1.16"
config.vm.provision:shell, inline: <<-SHELL
echo "root:rootroot" | sudo chpasswd
sudo timedatectl set-timezone Asia/Ho_Chi_Minh
SHELL

config.vm.define "ubuntu20.04" do |ubuntu|
    ubuntu.vm.hostname = "ubuntu20.04"
end

config.vm.provision:shell, path: "bootstrap.sh"

end

###**2. Bootstrap machine [`bootstrap.sh`](https://github.com/vumdao/vagrant/blob/master/ubuntu20.04/bootstrap.sh)**
- Install docker
- Resolve dns
- Install openSSH
- Enable root login
- Welcome message

!/bin/bash

Bootstrap machine

ensure_netplan_apply() {
# First node up assign dhcp IP for eth1, not base on netplan yml
sleep 5
sudo netplan apply
}

step=1
step() {
echo "Step $step $1"
step=$((step+1))
}

resolve_dns() {
step "===== Create symlink to /run/systemd/resolve/resolv.conf ====="
sudo rm /etc/resolv.conf
sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf
}

install_docker() {
step "===== Installing docker ====="
sudo apt update
sudo apt -y install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
if [ $? -ne 0 ]; then
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
fi
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt update
sudo apt install -y docker-ce docker-ce-cli containerd.io
sudo groupadd docker
sudo gpasswd -a $USER docker
sudo chmod 777 /var/run/docker.sock
# Add vagrant to docker group
sudo groupadd docker
sudo gpasswd -a vagrant docker
# Setup docker daemon host
# Read more about docker daemon https://docs.docker.com/engine/reference/commandline/dockerd/
sed -i 's/ExecStart=.*/ExecStart=\/usr\/bin\/dockerd -H unix:\/\/\/var\/run\/docker.sock -H tcp:\/\/192.168.121.210/g' /lib/systemd/system/docker.service
sudo systemctl daemon-reload
sudo systemctl restart docker
}

install_openssh() {
step "===== Installing openssh ====="
sudo apt update
sudo apt -y install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
sudo apt install -y openssh-server
sudo systemctl enable ssh
}

install_tools() {
sudo apt install -y python-pip
sudo apt install -y default-jre
pip install kafka --user
pip install kafka-python --user
}

setup_root_login() {
sudo sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config
sudo systemctl restart ssh
sudo echo "root:rootroot" | chpasswd
}

setup_welcome_msg() {
sudo apt -y install cowsay
sudo echo -e "\necho \"Welcome to Vagrant Ubuntu Server 18.04\" | cowsay\n" >> /home/vagrant/.bashrc
sudo ln -s /usr/games/cowsay /usr/local/bin/cowsay
}

main() {
ensure_netplan_apply
resolve_dns
install_openssh
setup_root_login
setup_welcome_msg
}

main

###**3. Start Vagrant**

⚡ $ vagrant up
Bringing machine 'ubuntu20.04' up with 'libvirt' provider...
==> ubuntu20.04: Box 'generic/ubuntu2004' could not be found. Attempting to find and install...
ubuntu20.04: Box Provider: libvirt
ubuntu20.04: Box Version: 3.1.16
==> ubuntu20.04: Loading metadata for box 'generic/ubuntu2004'
ubuntu20.04: URL: https://vagrantcloud.com/generic/ubuntu2004
==> ubuntu20.04: Adding box 'generic/ubuntu2004' (v3.1.16) for provider: libvirt
ubuntu20.04: Downloading: https://vagrantcloud.com/generic/boxes/ubuntu2004/versions/3.1.16/providers/libvirt.box
ubuntu20.04: Download redirected to host: vagrantcloud-files-production.s3.amazonaws.com
==> ubuntu2004: Checking if box 'generic/ubuntu2004' version '3.1.16' is up to date...
==> ubuntu2004: Creating image (snapshot of base box volume).
==> ubuntu2004: Creating domain with the following settings...
==> ubuntu2004: -- Name: ubuntu20.04_ubuntu2004
...

⚡ $ vagrant ssh

< Welcome to Vagrant Ubuntu Server 20.04 LTS (Focal Fossa) >

    \   ^__^
     \  (oo)\_______
        (__)\       )\/\
            ||----w |
            ||     ||

vagrant@ubuntu2004:~$

![Alt Text](https://dev-to-uploads.s3.amazonaws.com/i/gnvmy7g5m2ww165ztkdj.png)

Mirror: 
- https://github.com/vumdao/vagrant/tree/master/ubuntu20.04
- https://vumdao.hashnode.dev/create-an-ubuntu-2004-server-using-vagrant