preprod: add high conn modifier for relays during high load periods

Author: johnalotoski

flake/colmena.nix

@@ -578,6 +578,25 @@ in
         };
       };
 
+      # Non-default accepted connection limits for high load relays
+      hiConn = {
+        services.cardano-node.extraNodeConfig = {
+          AcceptedConnectionsLimit = {
+            # Default node process NOFILE limit is 65535
+            # If machines support sufficient bandwidth and CPU, defaults can be raised
+
+            # Following are the node defaults:
+            # hardLimit = 512
+            # softLimit = 384
+            # delay = 5;
+
+            hardLimit = 1024;
+            softLimit = 768;
+            delay = 5;
+          };
+        };
+      };
+
       buildkite = {imports = [nixosModules.buildkite-agent-containers];};
 
       bkCfg = queue: {
@@ -739,21 +758,21 @@ in
       # ---------------------------------------------------------------------------------------------------------
       # Preprod, two-thirds on release tag, one-third on pre-release tag
       preprod1-bp-a-1 = {imports = [eu-central-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod1") node bp mithrilRelease (declMRel "preprod1-rel-a-1")];};
-      preprod1-rel-a-1 = {imports = [eu-central-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod1") node rel preprodRelMig mithrilRelay (declMSigner "preprod1-bp-a-1")];};
-      preprod1-rel-b-1 = {imports = [eu-west-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod1") node rel preprodRelMig];};
-      preprod1-rel-c-1 = {imports = [us-east-2 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod1") node rel preprodRelMig tcpTxOpt];};
+      preprod1-rel-a-1 = {imports = [eu-central-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod1") node rel hiConn preprodRelMig mithrilRelay (declMSigner "preprod1-bp-a-1")];};
+      preprod1-rel-b-1 = {imports = [eu-west-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod1") node rel hiConn preprodRelMig];};
+      preprod1-rel-c-1 = {imports = [us-east-2 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod1") node rel hiConn preprodRelMig tcpTxOpt];};
       preprod1-dbsync-a-1 = {imports = [eu-central-1 r6a-xlarge (ebs 200) (group "preprod1") dbsync pre smash preprodSmash];};
       preprod1-faucet-a-1 = {imports = [eu-central-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod1") node faucet preprodFaucet];};
 
       preprod2-bp-b-1 = {imports = [eu-west-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod2") node bp mithrilRelease (declMRel "preprod2-rel-b-1")];};
-      preprod2-rel-a-1 = {imports = [eu-central-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod2") node rel preprodRelMig];};
-      preprod2-rel-b-1 = {imports = [eu-west-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod2") node rel preprodRelMig mithrilRelay (declMSigner "preprod2-bp-b-1")];};
-      preprod2-rel-c-1 = {imports = [us-east-2 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod2") node rel preprodRelMig tcpTxOpt];};
+      preprod2-rel-a-1 = {imports = [eu-central-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod2") node hiConn rel preprodRelMig];};
+      preprod2-rel-b-1 = {imports = [eu-west-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod2") node hiConn rel preprodRelMig mithrilRelay (declMSigner "preprod2-bp-b-1")];};
+      preprod2-rel-c-1 = {imports = [us-east-2 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod2") node hiConn rel preprodRelMig tcpTxOpt];};
 
       preprod3-bp-c-1 = {imports = [us-east-2 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod3") node bp pre mithrilRelease (declMRel "preprod3-rel-c-1")];};
-      preprod3-rel-a-1 = {imports = [eu-central-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod3") node rel pre preprodRelMig];};
-      preprod3-rel-b-1 = {imports = [eu-west-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod3") node rel pre preprodRelMig];};
-      preprod3-rel-c-1 = {imports = [us-east-2 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod3") node rel pre preprodRelMig mithrilRelay (declMSigner "preprod3-bp-c-1") tcpTxOpt];};
+      preprod3-rel-a-1 = {imports = [eu-central-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod3") node hiConn rel pre preprodRelMig];};
+      preprod3-rel-b-1 = {imports = [eu-west-1 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod3") node hiConn rel pre preprodRelMig];};
+      preprod3-rel-c-1 = {imports = [us-east-2 r6a-large (ebs 80) (nodeRamPct 70) (group "preprod3") node hiConn rel pre preprodRelMig mithrilRelay (declMSigner "preprod3-bp-c-1") tcpTxOpt];};
       # ---------------------------------------------------------------------------------------------------------
 
       # ---------------------------------------------------------------------------------------------------------