资源应用指标，例如容器 CPU 和内存使用率，可通过 Metrics API 在 Kubernetes 中取得。这些指标能够间接被用户拜访，比方应用 kubectl top 命令行，或者被集群中的控制器（例如 Horizontal Pod Autoscalers) 应用来做决策。
配置 api 聚合层
增加配置 api 启动 service 文件
--enable-aggregator-routing=true
ps -ef |grep apiserver|grep enable-aggregator-routing
root 1147 1 10 10:23 ? 00:30:13 /usr/local/bin/kube-apiserver --v=2 --logtostderr=true --allow-privileged=true --bind-address=0.0.0.0 --secure-port=6443 --insecure-port=0 --advertise-address=192.168.1.30 --service-cluster-ip-range=10.96.0.0/12 --service-node-port-range=30000-32767 --etcd-servers=https://192.168.1.30:2379,https://192.168.1.31:2379,https://192.168.1.32:2379 --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem --etcd-certfile=/etc/etcd/ssl/etcd.pem --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem --client-ca-file=/etc/kubernetes/pki/ca.pem --tls-cert-file=/etc/kubernetes/pki/apiserver.pem --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem --service-account-key-file=/etc/kubernetes/pki/sa.pub --service-account-signing-key-file=/etc/kubernetes/pki/sa.key --service-account-issuer=https://kubernetes.default.svc.cluster.local --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota --authorization-mode=Node,RBAC --enable-bootstrap-token-auth=true --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem --requestheader-allowed-names=aggregator --requestheader-group-headers=X-Remote-Group --requestheader-extra-headers-prefix=X-Remote-Extra- --requestheader-username-headers=X-Remote-User --enable-aggregator-routing=true创立利用权限 RBAC 资源文件
root@hello:~/cby# cat metrics-rbac.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: system:aggregated-metrics-reader
labels:
rbac.authorization.k8s.io/aggregate-to-view: "true"
rbac.authorization.k8s.io/aggregate-to-edit: "true"
rbac.authorization.k8s.io/aggregate-to-admin: "true"
rules:
- apiGroups: ["metrics.k8s.io"]
resources: ["pods", "nodes"]
verbs: ["get", "list", "watch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: metrics-server:system:auth-delegator
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:auth-delegator
subjects:
- kind: ServiceAccount
name: metrics-server
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: metrics-server-auth-reader
namespace: kube-system
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: extension-apiserver-authentication-reader
subjects:
- kind: ServiceAccount
name: metrics-server
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: system:metrics-server
rules:
- apiGroups:
- ""
resources:
- pods
- nodes
- nodes/stats
- namespaces
verbs:
- get
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: system:metrics-server
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:metrics-server
subjects:
- kind: ServiceAccount
name: metrics-server
namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: metrics-server
namespace: kube-system
root@hello:~/cby#创立 APIService 资源文件
设置扩大 API Service 工作于聚合层，容许应用其 API 扩大 Kubernetes apiserver，而这些 API 并不是外围 Kubernetes API 的一部分。这里部署 APIservice 资源，来提供 Kubernetes Metrics 指标 API 数据。
root@hello:~/cby# cat metrics-api-service.yaml
## APIService
apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
name: v1beta1.metrics.k8s.io
spec:
service:
name: metrics-server
namespace: kube-system
port: 443
group: metrics.k8s.io
version: v1beta1
insecureSkipTLSVerify: true
groupPriorityMinimum: 100
versionPriority: 100
root@hello:~/cby#创立 Metrics Server 利用资源文件
root@hello:~/cby# cat metrics-server-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: metrics-server
namespace: kube-system
labels:
k8s-app: metrics-server
spec:
selector:
matchLabels:
k8s-app: metrics-server
template:
metadata:
name: metrics-server
labels:
k8s-app: metrics-server
spec:
serviceAccountName: metrics-server
volumes:
# mount in tmp so we can safely use from-scratch images and/or read-only containers
- name: tmp-dir
emptyDir: {}
hostNetwork: true
containers:
- name: metrics-server
image: bitnami/metrics-server
# command:
# - /metrics-server
# - --kubelet-insecure-tls
# - --kubelet-preferred-address-types=InternalIP
args:
- --cert-dir=/tmp
- --secure-port=4443
- --kubelet-insecure-tls=true
- --kubelet-preferred-address-types=InternalIP,Hostname,InternalDNS,externalDNS
ports:
- name: main-port
containerPort: 4443
protocol: TCP
securityContext:
readOnlyRootFilesystem: true
runAsNonRoot: true
runAsUser: 1000
imagePullPolicy: Always
volumeMounts:
- name: tmp-dir
mountPath: /tmp
nodeSelector:
beta.kubernetes.io/os: linux
---
apiVersion: v1
kind: Service
metadata:
name: metrics-server
namespace: kube-system
labels:
kubernetes.io/name: "Metrics-server"
kubernetes.io/cluster-service: "true"
spec:
selector:
k8s-app: metrics-server
ports:
- port: 443
protocol: TCP
targetPort: 4443
root@hello:~/cby#通过 Kubectl 命令部署
root@hello:~/cby# kubectl apply -f metrics-rbac.yaml -n kube-system
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
serviceaccount/metrics-server created
root@hello:~/cby# kubectl apply -f metrics-api-service.yaml -n kube-system
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created
root@hello:~/cby# kubectl apply -f metrics-server-deploy.yaml -n kube-system
Warning: spec.template.spec.nodeSelector[beta.kubernetes.io/os]: deprecated since v1.14; use "kubernetes.io/os" instead
deployment.apps/metrics-server created
service/metrics-server created
root@hello:~/cby#
验证
root@hello:~/cby# kubectl get pod -A | grep metrics-server
kube-system metrics-server-5c69d5d5b7-b6246 1/1 Running 0 2m25s
root@hello:~/cby#
查看日志
root@hello:~/cby# kubectl logs -n kube-system metrics-server-5c69d5d5b7-b6246
I0328 07:11:37.676490 1 serving.go:341] Generated self-signed cert (/tmp/apiserver.crt, /tmp/apiserver.key)
I0328 07:11:38.148457 1 requestheader_controller.go:169] Starting RequestHeaderAuthRequestController
I0328 07:11:38.148472 1 configmap_cafile_content.go:202] Starting client-ca::kube-system::extension-apiserver-authentication::client-ca-file
I0328 07:11:38.148507 1 shared_informer.go:240] Waiting for caches to sync for client-ca::kube-system::extension-apiserver-authentication::client-ca-file
I0328 07:11:38.148475 1 configmap_cafile_content.go:202] Starting client-ca::kube-system::extension-apiserver-authentication::requestheader-client-ca-file
I0328 07:11:38.148550 1 shared_informer.go:240] Waiting for caches to sync for client-ca::kube-system::extension-apiserver-authentication::requestheader-client-ca-file
I0328 07:11:38.148490 1 shared_informer.go:240] Waiting for caches to sync for RequestHeaderAuthRequestController
I0328 07:11:38.149073 1 dynamic_serving_content.go:130] Starting serving-cert::/tmp/apiserver.crt::/tmp/apiserver.key
I0328 07:11:38.149428 1 secure_serving.go:202] Serving securely on [::]:4443
I0328 07:11:38.149535 1 tlsconfig.go:240] Starting DynamicServingCertificateController
I0328 07:11:38.248713 1 shared_informer.go:247] Caches are synced for RequestHeaderAuthRequestController
I0328 07:11:38.248732 1 shared_informer.go:247] Caches are synced for client-ca::kube-system::extension-apiserver-authentication::requestheader-client-ca-file
I0328 07:11:38.248754 1 shared_informer.go:247] Caches are synced for client-ca::kube-system::extension-apiserver-authentication::client-ca-file
root@hello:~/cby#
查看 node 资源信息
root@hello:~/cby# kubectl top node
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
192.168.1.50 184m 2% 4354Mi 56%
192.168.1.51 207m 2% 3892Mi 50%
192.168.1.52 197m 2% 3881Mi 50%
192.168.1.53 185m 2% 3528Mi 46%
192.168.1.54 109m 1% 3427Mi 44%
root@hello:~/cby#
查看 pod 资源信息
root@hello:~/cby# kubectl top pod -n kube-system
NAME CPU(cores) MEMORY(bytes)
calico-kube-controllers-754966f84c-jm7f7 5m 25Mi
calico-node-9tvck 43m 69Mi
calico-node-kt2pk 41m 68Mi
calico-node-skm82 45m 70Mi
calico-node-t4lhb 44m 65Mi
calico-node-tz5k9 45m 66Mi
coredns-596755dbff-7ggzl 3m 15Mi
dashboard-metrics-scraper-799d786dbf-s6r5f 1m 7Mi
kubernetes-dashboard-9f8c8b989-57fhz 1m 13Mi
metrics-server-5c69d5d5b7-b6246 4m 16Mi
node-local-dns-4hzvh 5m 17Mi
node-local-dns-6zpdh 3m 17Mi
node-local-dns-9jmzz 5m 16Mi
node-local-dns-q8pcw 5m 17Mi
node-local-dns-tpm6b 5m 29Mi
root@hello:~/cby#
查看单个 pod 资源信息
root@hello:~/cby# kubectl top pod -n kube-system metrics-server-5c69d5d5b7-b6246
NAME CPU(cores) MEMORY(bytes)
metrics-server-5c69d5d5b7-b6246 4m 13Mi
root@hello:~/cby#
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