Unable to ssh in a multi-machine vagrant environment I created a three node multi-machine vagrant environment and am having issues ssh'ing from one vagrant vm to another.  

Here is the Vagrantfile: 

Vagrant.configure("2") do |config| 
  config.vm.box = "centos/7"

  config.vm.define "master" do |master|
    master.vm.hostname = "master.local" 
    master.vm.network "private_network", type: "dhcp"
  end 

  config.vm.define "node1" do |node1|
     node1.vm.hostname = "node1.local" 
     node1.vm.network "private_network", type: "dhcp" 
  end 

  config.vm.define "node2" do |node2|
    node2.vm.hostname = "node2.local" 
    node2.vm.network "private_network", type: "dhcp" 
  end  
end 


The hosts file (same on each node):  

$ cat /etc/hosts
172.28.128.3    master.local    master
172.28.128.4    node1.local     node1
172.28.128.5    node2.local     node2


I can ping back and forth all day from any machine to the other but I cannot ssh from one vagrant vm to the other.  The typical error message is (from node1 to master):  

[vagrant@node1.local] $ ssh vagrant@172.28.128.3
Permission denied (publickey,gssapi-keyex,gssapi-with-mic) 


SSH is running and the port is open. 

The firewall is not running.  

I am sure this has to do with ssh keys.  I readily admit I am not an expert.
What am I doing wrong here folks?
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