contrib/kube-prometheus: Set podAntiAffinity for Prometheus & Alertmanager

contrib/kube-prometheus: Generate new manifests with antiAffinity

contrib/kube-prometheus: jb update

Documentation: Generate after updating kube-prometheus manifests

contrib/kube-prometheus: Move antiaffinity into own jsonnet file

foobar

jsonnet/kube-prometheus/kube-prometheus-anti-affinity.libsonnet

@@ -0,0 +1,39 @@
+local k = import 'ksonnet/ksonnet.beta.3/k.libsonnet';
+local statefulSet = k.apps.v1beta2.statefulSet;
+local affinity = statefulSet.mixin.spec.template.spec.affinity.podAntiAffinity.preferredDuringSchedulingIgnoredDuringExecutionType;
+local matchExpression = affinity.mixin.podAffinityTerm.labelSelector.matchExpressionsType;
+
+{
+  local antiaffinity(key, values) = {
+    affinity: {
+      podAntiAffinity: {
+        preferredDuringSchedulingIgnoredDuringExecution: [
+          affinity.new() +
+          affinity.withWeight(100) +
+          affinity.mixin.podAffinityTerm.withNamespaces($._config.namespace) +
+          affinity.mixin.podAffinityTerm.withTopologyKey('kubernetes.io/hostname') +
+          affinity.mixin.podAffinityTerm.labelSelector.withMatchExpressions([
+            matchExpression.new() +
+            matchExpression.withKey(key) +
+            matchExpression.withOperator('In') +
+            matchExpression.withValues(values),
+          ]),
+        ],
+      },
+    },
+  },
+
+  alertmanager+:: {
+    alertmanager+: {
+      spec+:
+        antiaffinity('alertmanager', [$._config.alertmanager.name]),
+    },
+  },
+
+  prometheus+: {
+    prometheus+: {
+      spec+:
+        antiaffinity('prometheus', [$._config.prometheus.name]),
+    },
+  },
+}