FEAT(applications): enable HA with replica 2 and soft anti-affinity

- Add replicaCount: 2 to docusaurus, headlamp, homer, mas, umami
- Add soft pod anti-affinity for node distribution
- Enable high availability across multiple nodes

docusaurus/helm-values.yaml

@@ -3,6 +3,7 @@
 
 controllers:
   main:
+    replicaCount: 2
     annotations:
       docusaurus/source-hash: "2024-12-30-v1"
     initContainers:
@@ -55,6 +56,16 @@ controllers:
                 port: 80
               initialDelaySeconds: 5
               periodSeconds: 5
+    # Affinity - Soft Anti-Affinity to spread pods across nodes
+    affinity:
+      podAntiAffinity:
+        preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            podAffinityTerm:
+              labelSelector:
+                matchLabels:
+                  app.kubernetes.io/name: docusaurus
+              topologyKey: kubernetes.io/hostname
 
 service:
   main:

headlamp/helm-values.yaml

@@ -1,6 +1,6 @@
 # Headlamp Helm Values
 
-replicaCount: 1
+replicaCount: 2
 
 image:
   registry: ghcr.io
@@ -52,3 +52,14 @@ config:
       name: headlamp-oidc
   extraArgs:
     - -oidc-skip-tls-verify
+
+# Affinity - Soft Anti-Affinity to spread pods across nodes
+affinity:
+  podAntiAffinity:
+    preferredDuringSchedulingIgnoredDuringExecution:
+      - weight: 100
+        podAffinityTerm:
+          labelSelector:
+            matchLabels:
+              app.kubernetes.io/name: headlamp
+          topologyKey: kubernetes.io/hostname

homer/helm-values.yaml

@@ -3,6 +3,7 @@
 
 controllers:
   main:
+    replicaCount: 2
     initContainers:
       copy-homer-files:
         image:
@@ -39,6 +40,16 @@ controllers:
             memory: 100Mi
           limits:
             memory: 150Mi
+    # Affinity - Soft Anti-Affinity to spread pods across nodes
+    affinity:
+      podAntiAffinity:
+        preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            podAffinityTerm:
+              labelSelector:
+                matchLabels:
+                  app.kubernetes.io/name: homer
+              topologyKey: kubernetes.io/hostname
 
 service:
   main:

mas/helm-values.yaml

@@ -12,6 +12,7 @@ serviceAccount:
 
 controllers:
   main:
+    replicaCount: 2
     strategy: RollingUpdate
     rollingUpdate:
       unavailable: 0
@@ -76,6 +77,16 @@ controllers:
                 port: 8000
               initialDelaySeconds: 0
               periodSeconds: 5
+    # Affinity - Soft Anti-Affinity to spread pods across nodes
+    affinity:
+      podAntiAffinity:
+        preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            podAffinityTerm:
+              labelSelector:
+                matchLabels:
+                  app.kubernetes.io/name: mas
+              topologyKey: kubernetes.io/hostname
 
 service:
   main:

umami/helm-values.yaml

@@ -44,7 +44,7 @@ resources:
   limits:
     memory: 576Mi
 
-replicaCount: 1
+replicaCount: 2
 
 # Autoscaling
 autoscaling:
@@ -77,3 +77,14 @@ readinessProbe:
     port: 3000
   initialDelaySeconds: 0
   periodSeconds: 5
+
+# Affinity - Soft Anti-Affinity to spread pods across nodes
+affinity:
+  podAntiAffinity:
+    preferredDuringSchedulingIgnoredDuringExecution:
+      - weight: 100
+        podAffinityTerm:
+          labelSelector:
+            matchLabels:
+              app.kubernetes.io/name: umami
+          topologyKey: kubernetes.io/hostname