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DHCP
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DNS
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PXE
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ISC DHCP
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dnsmasq
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TFTP
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Routing
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Static Routes
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BGP
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Port Forwarding
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<a href="https://github.com/poseidon/typhoon/edit/master/docs/topics/hardware.md" title="Edit this page" class="md-content__button md-icon">
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<h1 id="hardware">Hardware<a class="headerlink" href="#hardware" title="Permanent link">&para;</a></h1>
<p>Typhoon ensures certain networking hardware integrates well with bare-metal Kubernetes.</p>
<h2 id="ubiquiti">Ubiquiti<a class="headerlink" href="#ubiquiti" title="Permanent link">&para;</a></h2>
<p>Ubiquiti EdgeRouters and EdgeOS work well with bare-metal Kubernetes clusters. Familiarity with EdgeRouter setup and CLI usage is required.</p>
<h3 id="dhcp">DHCP<a class="headerlink" href="#dhcp" title="Permanent link">&para;</a></h3>
<p>Assign static IPs to clients with known MAC addresses. This is called a static mapping by EdgeOS. Configure the router with the commands based on region inventory.</p>
<div class="highlight"><pre><span></span><code>configure
show service dhcp-server shared-network
set service dhcp-server shared-network-name LAN subnet SUBNET static-mapping NAME mac-address MACADDR
set service dhcp-server shared-network-name LAN subnet SUBNET static-mapping NAME ip-address 10.0.0.20
</code></pre></div>
<h3 id="dns">DNS<a class="headerlink" href="#dns" title="Permanent link">&para;</a></h3>
<p>Add DNS A records to static IPs as <code>dnsmasq</code> host-records.</p>
<div class="highlight"><pre><span></span><code>configure
set service dns forwarding options host-record=node.example.com,10.0.0.20
</code></pre></div>
<p>Forward <code>*.svc.cluster.local</code> queries to the CoreDNS Kubernetes service IP to allow clients to resolve Kubernetes services.</p>
<div class="highlight"><pre><span></span><code>set service dns forwarding options server=/svc.cluster.local/10.3.0.10
commit-confirm
</code></pre></div>
<p>Restart <code>dnsmasq</code>.</p>
<div class="highlight"><pre><span></span><code>sudo /etc/init.d/dnsmasq restart
</code></pre></div>
<h3 id="pxe">PXE<a class="headerlink" href="#pxe" title="Permanent link">&para;</a></h3>
<p>Ubiquiti EdgeRouters can provide a PXE-enabled network boot environment for client machines.</p>
<h4 id="isc-dhcp">ISC DHCP<a class="headerlink" href="#isc-dhcp" title="Permanent link">&para;</a></h4>
<p>With ISC DHCP, add a subnet parameter to the LAN DHCP server to include an ISC DHCP config file.</p>
<div class="highlight"><pre><span></span><code>configure
show service dhcp-server shared-network-name NAME subnet SUBNET
set service dhcp-server shared-network-name NAME subnet SUBNET subnet-parameters &quot;include &amp;quot;/config/scripts/ipxe.conf&amp;quot;;&quot;
commit-confirm
</code></pre></div>
<p>Switch to root (i.e. <code>sudo -i</code>) and write the ISC DHCP config <code>/config/scripts/ipxe.conf</code>. iPXE client machines will chainload to <code>matchbox.example.com</code>, while non-iPXE clients will chainload to <code>undionly.kpxe</code> (requires TFTP).</p>
<div class="highlight"><pre><span></span><code>allow bootp;
allow booting;
next-server ADD_ROUTER_IP_HERE;
if exists user-class and option user-class = &quot;iPXE&quot; {
filename &quot;http://matchbox.example.com/boot.ipxe&quot;;
} else {
filename &quot;undionly.kpxe&quot;;
}
</code></pre></div>
<h4 id="dnsmasq">dnsmasq<a class="headerlink" href="#dnsmasq" title="Permanent link">&para;</a></h4>
<p>With dnsmasq for DHCP, add options to chainload PXE clients to iPXE <code>undionly.kpxe</code> (requires TFTP), tag iPXE clients, and chainload iPXE clients to <code>matchbox.example.com</code>.</p>
<div class="highlight"><pre><span></span><code>set service dns forwarding options &#39;dhcp-userclass=set:ipxe,iPXE&#39;
set service dns forwarding options &#39;pxe-service=tag:#ipxe,x86PC,PXE chainload to iPXE,undionly.kpxe&#39;
set service dns forwarding options &#39;pxe-service=tag:ipxe,x86PC,iPXE,http://matchbox.example.com/boot.ipxe&#39;
</code></pre></div>
<h3 id="tftp">TFTP<a class="headerlink" href="#tftp" title="Permanent link">&para;</a></h3>
<p>Use <code>dnsmasq</code> as a TFTP server to serve <code>undionly.kpxe</code>. Compiling from <a href="https://github.com/ipxe/ipxe">source</a> with TLS support is strongly recommended. If you use a <a href="http://boot.ipxe.org/undionly.kpxe">pre-compiled</a> copy, you must set <code>download_protocol = "http"</code> in your cluster definition (discouraged).</p>
<div class="highlight"><pre><span></span><code>sudo -i
mkdir /config/tftpboot &amp;&amp; cd /config/tftpboot
curl http://boot.ipxe.org/undionly.kpxe -o undionly.kpxe
</code></pre></div>
<p>Add <code>dnsmasq</code> command line options to enable the TFTP file server.</p>
<div class="highlight"><pre><span></span><code>configure
show service dns forwarding
set service dns forwarding options enable-tftp
set service dns forwarding options tftp-root=/config/tftpboot
commit-confirm
</code></pre></div>
<h3 id="routing">Routing<a class="headerlink" href="#routing" title="Permanent link">&para;</a></h3>
<h4 id="static-routes">Static Routes<a class="headerlink" href="#static-routes" title="Permanent link">&para;</a></h4>
<p>Add static route(s) to Kubernetes node(s) that can route to Kubernetes service IPs (default: 10.3.0.0/16). Kubernetes service IPs will become routeable on the LAN.</p>
<div class="highlight"><pre><span></span><code>configure
show protocols static route
set protocols static route 10.3.0.0/16 next-hop NODE_IP
commit-confirm
</code></pre></div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Adding multiple next-hop nodes provides equal-cost multi-path (ECMP) routing. EdgeOS v2.0+ is required. The kernel in prior versions used flow-hash to balanced packets, whereas with v2.0, round-robin sessions are used.</p>
</div>
<h4 id="bgp">BGP<a class="headerlink" href="#bgp" title="Permanent link">&para;</a></h4>
<p>EdgeRouter can exchange routes with other autonomous systems, including a cluster's Calico AS. Peers will exchange <code>podCIDR</code> routes to make individual pods routeable on the LAN.</p>
<p>Define the EdgeRouter AS (if undefined).</p>
<div class="highlight"><pre><span></span><code>configure
show protocols bgp 1
set protocols bgp 1 parameters router-id ROUTER_IP
</code></pre></div>
<p>Peer with node(s) in another AS (eg. Calico default 64512)</p>
<div class="highlight"><pre><span></span><code>set protocols bgp 1 neighbor NODE1_IP remote-as 64512
set protocols bgp 1 neighbor NODE2_IP remote-as 64512
set protocols bgp 1 neighbor NODE3_IP remote-as 64512
commit-confirm
</code></pre></div>
<p>Configure Calico node(s) as to peer with the EdgeRouter.</p>
<div class="highlight"><pre><span></span><code>apiVersion: crd.projectcalico.org/v1
kind: BGPPeer
metadata:
name: NODE_NAME-to-edgerouter
spec:
peerIP: ROUTER_IP
asNumber: 1
node: NODE_NAME
</code></pre></div>
<p>Or, if every node is to be peered (i.e. full mesh), define a global BGPPeer.</p>
<div class="highlight"><pre><span></span><code>apiVersion: crd.projectcalico.org/v1
kind: BGPPeer
metadata:
name: global
spec:
peerIP: ROUTER_IP
asNumber: 1
</code></pre></div>
<p>If Calico nodes should advertise Kubernetes Service IPs (i.e. ClusterIPs) as well, add a <code>BGPConfiguration</code>.</p>
<div class="highlight"><pre><span></span><code>apiVersion: crd.projectcalico.org/v1
kind: BGPConfiguration
metadata:
name: default
spec:
logSeverityScreen: Info
nodeToNodeMeshEnabled: true
serviceClusterIPs:
- cidr: 10.3.0.0/16
</code></pre></div>
<p>Show a summary of peers and exchanged routes.</p>
<div class="highlight"><pre><span></span><code>show ip bgp summary
show ip route bgp
</code></pre></div>
<h3 id="port-forwarding">Port Forwarding<a class="headerlink" href="#port-forwarding" title="Permanent link">&para;</a></h3>
<p>Expose the <a href="/addons/ingress/#bare-metal">Ingress Controller</a> by adding <code>port-forward</code> rules that DNAT a port on the router's WAN interface to an internal IP and port. By convention, a public Ingress controller is assigned a fixed service IP (e.g. 10.3.0.12).</p>
<div class="highlight"><pre><span></span><code>configure
set port-forward wan-interface eth0
set port-forward lan-interface eth1
set port-forward auto-firewall enable
set port-forward hairpin-nat enable
set port-forward rule 1 description &#39;ingress http&#39;
set port-forward rule 1 forward-to address 10.3.0.12
set port-forward rule 1 forward-to port 80
set port-forward rule 1 original-port 80
set port-forward rule 1 protocol tcp_udp
set port-forward rule 2 description &#39;ingress https&#39;
set port-forward rule 2 forward-to address 10.3.0.12
set port-forward rule 2 forward-to port 443
set port-forward rule 2 original-port 443
set port-forward rule 2 protocol tcp_udp
commit-confirm
</code></pre></div>
<h3 id="web-ui">Web UI<a class="headerlink" href="#web-ui" title="Permanent link">&para;</a></h3>
<p>The web UI is often accessible from the LAN on ports 80/443 by default. Edit the ports to 8080 and 4443 to avoid a conflict.</p>
<div class="highlight"><pre><span></span><code>configure
show service gui
set service gui http-port 8080
set service gui https-port 4443
commit-confirm
</code></pre></div>
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