From a67286151f51bdcf05a8aa228c3ad8d379ac11b9 Mon Sep 17 00:00:00 2001
From: Matt McEuen <madgin@madgin.net>
Date: Thu, 2 Sep 2021 19:59:16 -0500
Subject: [PATCH] Configure AIAP pod anti-affinity

This adds an anti-affinity rule to airship-in-a-pod, so that only
a single AIAP can run on a given node at a time.  This is currently
required because of the way AIAP configures host mounts; future work
will allow multiple AIAPs to co-exist on a node, at which point this
anti-affinity rule can be taken out.

Change-Id: Ib8f5062a3bd2b4ea6d0a95c42cce08ac9789c362
---
 .../examples/base/airship-in-a-pod.yaml                | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/airship-in-a-pod/examples/base/airship-in-a-pod.yaml b/tools/airship-in-a-pod/examples/base/airship-in-a-pod.yaml
index bb9af2b2c..070dcbec0 100644
--- a/tools/airship-in-a-pod/examples/base/airship-in-a-pod.yaml
+++ b/tools/airship-in-a-pod/examples/base/airship-in-a-pod.yaml
@@ -14,7 +14,17 @@ apiVersion: v1
 kind: Pod
 metadata:
   name: airship-in-a-pod
+  labels:
+    aiap: aiap
 spec:
+  affinity:
+    podAntiAffinity:
+      requiredDuringSchedulingIgnoredDuringExecution:
+      - labelSelector:
+          matchExpressions:
+          - key: aiap
+            operator: Exists
+        topologyKey: kubernetes.io/hostname
   hostNetwork: false
   restartPolicy: Never
   containers: