Fix max-pods-calculator to consider only network card 0 (#1930)

Author: Pavani-Panakanti

templates/al2/runtime/max-pods-calculator.sh

@@ -116,15 +116,16 @@ if [[ "$CNI_MAJOR_VERSION" -gt 1 ]] || ([[ "$CNI_MAJOR_VERSION" = 1 ]] && [[ "$C
   PREFIX_DELEGATION_SUPPORTED=true
 fi
 
-DESCRIBE_INSTANCES_RESULT=$(aws ec2 describe-instance-types --instance-type "${INSTANCE_TYPE}" --query 'InstanceTypes[0].{Hypervisor: Hypervisor, EniCount: NetworkInfo.MaximumNetworkInterfaces, PodsPerEniCount: NetworkInfo.Ipv4AddressesPerInterface, CpuCount: VCpuInfo.DefaultVCpus}' --output json)
-
+DESCRIBE_INSTANCES_RESULT=$(aws ec2 describe-instance-types --instance-type "${INSTANCE_TYPE}" --query 'InstanceTypes[0].{Hypervisor: Hypervisor, NetworkInfo: NetworkInfo, CpuCount: VCpuInfo.DefaultVCpus}' --output json)
 HYPERVISOR_TYPE=$(echo $DESCRIBE_INSTANCES_RESULT | jq -r '.Hypervisor')
 IS_NITRO=false
 if [[ "$HYPERVISOR_TYPE" == "nitro" ]]; then
   IS_NITRO=true
 fi
-INSTANCE_MAX_ENIS=$(echo $DESCRIBE_INSTANCES_RESULT | jq -r '.EniCount')
-INSTANCE_MAX_ENIS_IPS=$(echo $DESCRIBE_INSTANCES_RESULT | jq -r '.PodsPerEniCount')
+# Only one network card is used for pods, the default network card which is usually the network card 0
+DEFAULT_NETWORK_CARD_INDEX=$(echo $DESCRIBE_INSTANCES_RESULT | jq -r '.NetworkInfo.DefaultNetworkCardIndex')
+INSTANCE_MAX_ENIS=$(echo $DESCRIBE_INSTANCES_RESULT | jq -r ".NetworkInfo.NetworkCards[$DEFAULT_NETWORK_CARD_INDEX].MaximumNetworkInterfaces")
+INSTANCE_MAX_ENIS_IPS=$(echo $DESCRIBE_INSTANCES_RESULT | jq -r '.NetworkInfo.Ipv4AddressesPerInterface')
 
 if [ -z "$CNI_MAX_ENI" ]; then
   enis_for_pods=$INSTANCE_MAX_ENIS

templates/test/cases/max-pods-cni-1-18-0.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+echo "-> Should calc max-pods successfully for c6in.32xlarge VPC CNI 1.18.0"
+exit_code=0
+out=$(/etc/eks/max-pods-calculator.sh \
+  --instance-type c6in.32xlarge \
+  --cni-version 1.18.0 \
+  --show-max-allowed || exit_code=$?)
+echo $out
+
+if [[ ${exit_code} -ne 0 ]]; then
+  echo "❌ Test Failed: expected a non-zero exit code but got '${exit_code}'"
+  exit 1
+fi
+expected_max_pods="394"
+actual_max_pods=$(grep -o '[0-9]\+' <<< ${out})
+if [[ ${actual_max_pods} -ne ${expected_max_pods} ]]; then
+  echo "❌ Test Failed: expected max-pods for c6in.32xlarge w/ CNI 1.18.5 to be '${expected_max_pods}', but got '${actual_max_pods}'"
+  exit 1
+fi

templates/test/mocks/describe-instance-types/c6in-32xlarge.json

@@ -0,0 +1,36 @@
+{
+    "Hypervisor": "nitro",
+    "NetworkInfo": {
+        "NetworkPerformance": "200 Gigabit",
+        "MaximumNetworkInterfaces": 16,
+        "MaximumNetworkCards": 2,
+        "DefaultNetworkCardIndex": 0,
+        "NetworkCards": [
+            {
+                "NetworkCardIndex": 0,
+                "NetworkPerformance": "Up to 170 Gigabit",
+                "MaximumNetworkInterfaces": 8,
+                "BaselineBandwidthInGbps": 200.0,
+                "PeakBandwidthInGbps": 200.0
+            },
+            {
+                "NetworkCardIndex": 1,
+                "NetworkPerformance": "Up to 170 Gigabit",
+                "MaximumNetworkInterfaces": 8,
+                "BaselineBandwidthInGbps": 200.0,
+                "PeakBandwidthInGbps": 200.0
+            }
+        ],
+        "Ipv4AddressesPerInterface": 50,
+        "Ipv6AddressesPerInterface": 50,
+        "Ipv6Supported": true,
+        "EnaSupport": "required",
+        "EfaSupported": true,
+        "EfaInfo": {
+            "MaximumEfaInterfaces": 2
+        },
+        "EncryptionInTransitSupported": true,
+        "EnaSrdSupported": false
+    },
+    "CpuCount": 128
+}

templates/test/mocks/describe-instance-types/m4-xlarge.json

@@ -1,6 +1,26 @@
 {
     "Hypervisor": "xen",
-    "EniCount": 4,
-    "PodsPerEniCount": 15,
+    "NetworkInfo": {
+        "NetworkPerformance": "High",
+        "MaximumNetworkInterfaces": 4,
+        "MaximumNetworkCards": 1,
+        "DefaultNetworkCardIndex": 0,
+        "NetworkCards": [
+            {
+                "NetworkCardIndex": 0,
+                "NetworkPerformance": "High",
+                "MaximumNetworkInterfaces": 4,
+                "BaselineBandwidthInGbps": 0.75,
+                "PeakBandwidthInGbps": 2.8
+            }
+        ],
+        "Ipv4AddressesPerInterface": 15,
+        "Ipv6AddressesPerInterface": 15,
+        "Ipv6Supported": true,
+        "EnaSupport": "unsupported",
+        "EfaSupported": false,
+        "EncryptionInTransitSupported": false,
+        "EnaSrdSupported": false
+    },
     "CpuCount": 4
 }

templates/test/mocks/describe-instance-types/m5-8xlarge.json

@@ -1,6 +1,26 @@
 {
     "Hypervisor": "nitro",
-    "EniCount": 8,
-    "PodsPerEniCount": 30,
+    "NetworkInfo": {
+        "NetworkPerformance": "10 Gigabit",
+        "MaximumNetworkInterfaces": 8,
+        "MaximumNetworkCards": 1,
+        "DefaultNetworkCardIndex": 0,
+        "NetworkCards": [
+            {
+                "NetworkCardIndex": 0,
+                "NetworkPerformance": "10 Gigabit",
+                "MaximumNetworkInterfaces": 8,
+                "BaselineBandwidthInGbps": 10.0,
+                "PeakBandwidthInGbps": 10.0
+            }
+        ],
+        "Ipv4AddressesPerInterface": 30,
+        "Ipv6AddressesPerInterface": 30,
+        "Ipv6Supported": true,
+        "EnaSupport": "required",
+        "EfaSupported": false,
+        "EncryptionInTransitSupported": false,
+        "EnaSrdSupported": false
+    },
     "CpuCount": 32
 }