Add Ingress and Storage test slides with Vagrant instructions

pages/diagram.md

@@ -4,6 +4,7 @@ level: 2
 
 # MVK
 
+The **V** in MVK is for *viable*, so why is MVK viable ?
 
 <div class="grid grid-cols-1">
 
@@ -15,12 +16,12 @@ flowchart LR
     LH[Longhorn]
     ING[Ingress]
     TRA[Traefik]
-    CM[cert-manager]
+    MET[Metallb]
     ETCD[etcd]
     KA[keepalived]
     
     root --> PS --> LH
-    root --> ING --> TRA --> CM
+    root --> ING --> TRA --> MET
     root --> ETCD --> KA
     
     classDef default fill:transparent,color:#fff,stroke:#888
@@ -35,3 +36,23 @@ We have in the build so far etcd and keepalived
 there is still no persistent volume management or ingress
 
 </div>
+
+<!--
+
+why is MVK 'viable' ?
+
+Out of the box K8s examples and some deployments are not useable without other externalities
+
+* Persistent storage - often built in to managed kubernetes cloud platforms
+* Ingress - is also provided by cloud providers, K8s does not natively have this
+* ETCD is often offered as the 'management plane', again as part of managed kubernetes by cloud providers
+
+K3s does not use k8s traditional 3 node ETCD unless you configure it to do so
+
+MKK's infctl pipelines configure 3 node k3s on all 3 nodes
+
+it also adds Longhorn for persistent storage
+
+ingress is impossible without metallb and some kind of load balancer - traefik being my preference but others could be used, of course
+
+-->