Unable to ssh in a multi-machine vagrant environment
Following Vagrant file address this problem.

You can get all supporting key files along with this vagrant file at https://github.com/malyabee/IaaC/tree/master/ansible_lab

$commonscript = &lt;&lt;-SCRIPT
sudo yum update -y
sudo yum install python2 epel-release -y
sudo yum install -y ansible
sudo echo "192.168.22.10    ansiblecontroller.example.com ansiblecontroller" &gt;&gt; /etc/hosts
sudo echo "192.168.22.11   node01.example.com   node01" &gt;&gt; /etc/hosts
sudo echo "192.168.22.12   node02.example.com      node02" &gt;&gt; /etc/hosts
SCRIPT

$nodescript = &lt;&lt;-SCRIPT
cat /vagrant/ansible_lab.pub &gt;&gt; /home/vagrant/.ssh/authorized_keys
SCRIPT

$ansiblescript = &lt;&lt;-SCRIPT
sudo yum install ansible -y
sudo cp -r /vagrant/ansible_lab /home/vagrant/.ssh/id_rsa
sudo chmod 400  /home/vagrant/.ssh/id_rsa
sudo chown vagrant:vagrant /home/vagrant/.ssh/id_rsa
SCRIPT

Vagrant.configure("2") do |config|
  config.vm.provision "shell", inline: "echo Hello"

  config.vm.define "ansiblecontroller" do |ansiblecontroller|
    ansiblecontroller.vm.box = "centos/7"
    ansiblecontroller.vm.provider "virtualbox" do |v|
          v.memory = 512
          v.cpus = 1
       end
    ansiblecontroller.vm.network "private_network", ip: "192.168.22.10", virtualbox__intnet: "mynetwork01"
    ansiblecontroller.vm.hostname = "ansiblecontroller.example.com"
    # Installing required packages for ansible controller node
    ansiblecontroller.vm.provision "shell", inline: $commonscript
    ansiblecontroller.vm.provision "shell", inline: $ansiblescript
  end

  config.vm.define "node01" do |node01|
    node01.vm.box = "centos/7"
    node01.vm.provider "virtualbox" do |v|
          v.memory = 512
          v.cpus = 1
       end
    node01.vm.network "private_network", ip: "192.168.22.11", virtualbox__intnet: "mynetwork01"
    node01.vm.hostname = "node01.example.com"
    # Installing required packages for  node01
    node01.vm.provision "shell", inline: $commonscript
    node01.vm.provision "shell", inline: $nodescript
  end
  config.vm.define "node02" do |node02|
    node02.vm.box = "centos/7"
    node02.vm.provider "virtualbox" do |v|
          v.memory = 512
          v.cpus = 1
       end
    node02.vm.network "private_network", ip: "192.168.22.12", virtualbox__intnet: "mynetwork01"
    node02.vm.hostname = "node02.example.com"
    # Installing required packages for  node01
    node02.vm.provision "shell", inline: $commonscript
    node02.vm.provision "shell", inline: $nodescript
  end
end