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[英]Kubernetes AntiAffinity - limit max number of same pods per node
[英]GKE mismatch limit of Kubernetes pods per node from official documentation
我在谷歌雲平台上調整一個小型 kubernetes 集群,我的參考是以下文檔: https://cloud.google.com/kubernetes-engine/docs/how-to/flexible-pod-cidr#overview
所以我有
當我部署集群並啟動 POD 的 nginx 副本時,我最多只能達到 30 個,而我希望達到 48 個 POD。
根據谷歌文檔,我應該有一個 /27(我可以看到在每個節點上分配)和 9-16 之間的節點范圍。 現在,雖然考慮到 9-16 范圍,平均 10 個節點是公平的,但我不明白為什么它沒有擴大到這個數字以上。
這是供您查看的代碼,我無法查看是否有任何其他限制:
gcloud compute networks subnets create $SERVICE_PROJECT1_SUB_K8S_NODES \
--network $SHAREDVPC --region $REGION \
--range 10.222.5.32/28 --secondary-range \
$SERVICE_PROJECT1_SUB_K8S_PODS=10.222.6.0/24, \
$SERVICE_PROJECT1_SUB_K8S_SERVICES=10.222.5.128/25 \
--enable-private-ip-google-access
gcloud beta container clusters create service1-k8s-cluster \
--zone $REGION \
--network projects/$HOST_PROJECT_ID/global/networks/$SHAREDVPC \
--subnetwork projects/$HOST_PROJECT_ID/regions/$REGION/subnetworks/$SERVICE_PROJECT1_SUB_K8S_NODES \
--cluster-secondary-range-name $SERVICE_PROJECT1_SUB_K8S_PODS \
--services-secondary-range-name $SERVICE_PROJECT1_SUB_K8S_SERVICES \
--enable-master-authorized-networks \
--master-authorized-networks 10.222.1.0/24 \
--enable-ip-alias \
--enable-private-nodes \
--enable-private-endpoint \
--master-ipv4-cidr $SERVICE_PROJECT1_SUB_K8S_MASTER \
--no-enable-basic-auth \
--no-issue-client-certificate \
--enable-master-global-access \
--num-nodes 1 \
--default-max-pods-per-node 16 \
--max-pods-per-node 16 \
--machine-type n1-standard-2
我在 POD 中看到的錯誤
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal NotTriggerScaleUp 4m53s (x151 over 29m) cluster-autoscaler pod didn't trigger scale-up (it wouldn't fit if a new node is added):
Warning FailedScheduling 8s (x22 over 29m) default-scheduler 0/3 nodes are available: 3 Insufficient pods.
您永遠不會達到 48 個閾值,有一些用於守護程序集的 IP 會阻止您達到您為自己設置的高閾值,例如在我的集群中我有以下
kube-system fluentd-gcp-v3.1.1-grkv8 100m (1%) 1 (12%) 200Mi (0%) 500Mi (1%) 10d
kube-system kube-proxy-gke-eng-e2e-main-gke-e2e-n1-highmem-8-501281f5-9ck0 100m (1%) 0 (0%) 0 (0%) 0 (0%) 3d19h
kube-system network-metering-agent-ck74l 0 (0%) 0 (0%) 0 (0%) 0 (0%) 10d
kube-system prometheus-to-sd-qqsn6 1m (0%) 3m (0%) 20Mi (0%) 37Mi (0%) 10d
monitor prometheus-prometheus-node-exporter-8229c 0 (0%) 0 (0%) 0 (0%) 0 (0%) 11d
neuvector neuvector-enforcer-pod-p79j5 100m (1%) 2 (25%) 128Mi (0%) 1Gi (2%) 11d
這是針對每個節點,守護程序集在每個節點上部署這些 pod,有效地將我的應用程序 pod 可用的 IP 數量減少了 6。
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