Merge "Optimize kernel neighbour table for large scale environments"

1 files changed, 29 insertions, 0 deletions

diff --git a/puppet/services/kernel.yaml b/puppet/services/kernel.yaml
index 697ec228..8121454b 100644
--- a/puppet/services/kernel.yaml
+++ b/puppet/services/kernel.yaml
@@ -34,6 +34,28 @@ parameters:
     default: 0
     description: Configures sysctl net.ipv6.{default/all}.disable_ipv6 keys
     type: number
+  NeighbourGcThreshold1:
+    default: 1024
+    description: Configures sysctl net.ipv4.neigh.default.gc_thresh1 value.
+                 This is the minimum number of entries to keep in the ARP
+                 cache. The garbage collector will not run if there are
+                 fewer than this number of entries in the cache.
+    type: number
+  NeighbourGcThreshold2:
+    default: 2048
+    description: Configures sysctl net.ipv4.neigh.default.gc_thresh2 value.
+                 This is the soft maximum number of entries to keep in the
+                 ARP cache. The garbage collector will  allow the number of
+                 entries to exceed this for 5 seconds before collection will
+                 be performed.
+    type: number
+  NeighbourGcThreshold3:
+    default: 4096
+    description: Configures sysctl net.ipv4.neigh.default.gc_thresh3 value.
+                 This is the hard maximum number of entries to keep in the
+                 ARP cache. The garbage collector will always run if there
+                 are more than this number of entries in the cache.
+    type: number
 
 outputs:
   role_data:
@@ -94,5 +116,12 @@ outputs:
             value: 1
           fs.suid_dumpable:
             value: 0
+          #avoid neighbour table overflow on large deployments
+          net.ipv4.neigh.default.gc_thresh1:
+            value: {get_param: NeighbourGcThreshold1}
+          net.ipv4.neigh.default.gc_thresh2:
+            value: {get_param: NeighbourGcThreshold2}
+          net.ipv4.neigh.default.gc_thresh3:
+            value: {get_param: NeighbourGcThreshold3}
       step_config: |
         include ::tripleo::profile::base::kernel