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                  <h1>Ansible KVM Router Lab Part 2</h1>
                
                <p>date: 2021-10-16</p>
<h2 id="introduction">Introduction</h2>
<p>This is Part 2 of a multi-part series of blog posts for building a
<a href="https://github.com/TrentSPalmer/router-lab" target="_blank">router lab</a>
automatically using a series of bash scripts and ansible.</p>
<p><a href="/posts/ansible-kvm-router-lab-part-1/" target="_blank">Ansible KVM Router Lab Part 1</a>
is an overview.</p>
<p>In this post I begin breaking down the bash scripts which build the router
lab, beginning with
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/build_vms.bash" target="_blank">build_vms.bash</a>.</p>
<p>In <a href="/posts/ansible-kvm-router-lab-part-3/" target="_blank">Ansible KVM Router Lab Part 3</a>,
I explain
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/define_bridge_networks.bash" target="_blank">define_bridge_networks.bash</a>
and <a href="https://github.com/TrentSPalmer/router-lab/blob/master/shutdown_vms.bash" target="_blank">shutdown_vms.bash</a>
scripts which are used to construct the lab.</p>
<p>In <a href="/posts/ansible-kvm-router-lab-part-4/" target="_blank">Ansible KVM Router Lab Part 4</a>,
I explain
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/connect_vms_to_bridges.bash" target="_blank">connect_vms_to_bridges.bash</a>,
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/start_vms.bash" target="_blank">start_vms.bash</a>,
and <a href="https://github.com/TrentSPalmer/router-lab/blob/master/rebuild_known_hosts.bash" target="_blank">rebuild_known_hosts.bash</a>
scripts which are used to construct the lab.</p>
<p>In <a href="/posts/ansible-kvm-router-lab-part-5/" target="_blank">Ansible KVM Router Lab Part 5</a>,
I explain the ansible playbook tasks used to finish building the lab.</p>
<p>In <a href="/posts/ansible-kvm-router-lab-part-6/" target="_blank">Ansible KVM Router Lab Part 6</a>,
I explain
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/disconnect_vms_from_bridges.bash" target="_blank">disconnect_vms_from_bridges.bash</a>,
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/undefine_and_remove_vms.bash" target="_blank">undefine_and_remove_vms.bash</a>,
and <a href="https://github.com/TrentSPalmer/router-lab/blob/master/remove_bridge_networks.bash" target="_blank">remove_bridge_networks</a>
which are used to destroy the lab.</p>
<h2 id="build_vmsbash"><code>build_vms.bash</code></h2>
<h3 id="check_uid-0"><code>check_uid "0"</code></h3>
<p><a href="https://github.com/TrentSPalmer/router-lab/blob/master/build_vms.bash">build_vms.bash</a>
begins by making sure that it is run as the <em>root</em> user. This is because root is required to
ssh into the clones to change their hostnames, machine-ids, and host-ssh-keys. You can call
with <code>sudo bash build_vms.bash</code>.</p>
<p>For this same reason, <code>~/.ssh/known_hosts</code> is useless so it is deleted (and then rebuilt).</p>
<h3 id="function-build_vms"><code>function build_vms()</code></h3>
<p>Next, 
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/build_vms.bash" target="_blank">build_vms.bash</a>
calls <code>build_vms</code>, which loops over the array of MACHINES, which is an
array that holds that names of the lab clients, passing each name in turn
to <code>create_vm</code>.</p>
<p><code>create_vm</code> creates the virtual machine if it does not already exist, using <code>virt-clone</code>, and
then calls <code>start_vm</code> to start it.</p>
<p><code>start_vm</code> is exported from
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/env.bash.example" target="_blank">env.bash</a>,
and per parsing the output of <code>virsh list --inactive</code>, starts the virtual machine if it is not running.</p>
<h3 id="function-set_hostnames"><code>function set_hostnames()</code></h3>
<p>Next, 
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/build_vms.bash" target="_blank">build_vms.bash</a>
calls <code>set_hostnames</code>, which simultaneously calls <code>set_hostname</code> on the entire MACHINES array. <code>set_hostname</code>
in turn waits for the virtual machine to be fully booted, then updates the files <code>/etc/hostname</code> and
<code>/etc/hosts</code>, and then reboots the virtual machine to apply the new hostname.</p>
<h3 id="function-confirm_hostnames"><code>function confirm_hostnames()</code></h3>
<p><code>confirm_hostnames</code> simultaneously calls <code>confirm_hostname</code> against the entire MACHINES array.
<code>confirm_hostname</code> waits for the virtual machine to be fully booted, then confirms the correct
<em>hostname</em> in <code>/etc/hostname</code>.</p>
<h3 id="function-confirm_hostnames_in_hosts"><code>function confirm_hostnames_in_hosts()</code></h3>
<p><code>confirm_hostnames_in_hosts</code> works almost exactly the same as <code>confirm_hostnames</code>, but this time
the file <code>/etc/hosts</code> on the virtual machine is grepped for the proper <em>hostname</em>, and corrected
if necessary.</p>
<h3 id="function-reset_hosts_ssh_keys"><code>function reset_hosts_ssh_keys()</code></h3>
<p><code>reset_hosts_ssh_keys</code> simultaneously calls <code>reset_host_ssh_keys</code> against the MACHINES array,
which in turn compares the host_ssh_key of the virtual machine against the <em>bas3</em> virtual
machine, and if necessary deletes <code>/etc/ssh/ssh_host_*</code>, generates new host_ssh_keys, restarts
<code>sshd</code> on the virtual machine, removes <code>~/.ssh/known_hosts</code>, and then reruns itself in
order to confirm the new host_ssh_keys.</p>
<h3 id="function-reset_machine_ids"><code>function reset_machine_ids()</code></h3>
<p><code>reset_machine_ids</code> simultaneously calls <code>reset_machine_id</code> against the entire MACHINES array,
which in turn checks the <em>machine-id</em> of the virtual machine to make sure that it is different
than the <em>machine-id</em> of the <em>base</em> virtual machine, and if necessary deletes
<code>/etc/machine-id</code> and <code>/var/lib/dbus/machine-id</code> and recreates them.</p>
<h2 id="to-be-continued">To Be Continued</h2>
<p>In <a href="/posts/ansible-kvm-router-lab-part-3/" target="_blank">Ansible KVM Router Lab Part 3</a>,
I explain
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/define_bridge_networks.bash" target="_blank">define_bridge_networks.bash</a>
and
<a href="https://github.com/TrentSPalmer/router-lab/blob/master/shutdown_vms.bash" target="_blank">shutdown_vms.bash</a>
scripts which are used to construct the lab.</p>
                
                  
                
              
  

              
    
                


              
    
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