部署metrics-server

开启apiserver聚合服务

[root@master ~]# vim /etc/kubernetes/manifests/kube-apiserver.yaml
# spec.containers.command 最下面手动添加如下一行
    - --enable-aggregator-routing=true
[root@master ~]# systemctl restart kubelet
[root@master ~]# kubectl -n kube-system get pod kube-apiserver-master -o yaml |grep enable-aggregator-routing
    - --enable-aggregator-routing=true

证书的申请与签发

要在所有节点执行（master，node-0001，node-0002，node-0003）

申请的多余证书可以使用 （kubectl delete certificatesigningrequests 证书名称） 删除

[root@node-0001 ~]# vim /var/lib/kubelet/config.yaml
# 在文件的最后一行添加
serverTLSBootstrap: true
[root@node-0001 ~]# systemctl restart kubelet
#-------------------------签发证书必须在 master 上执行 ------------------------------------
[root@master ~]# kubectl get certificatesigningrequests
NAME        AGE   REQUESTOR            CONDITION
csr-wsfz7   8s    system:node:master   Pending
[root@master ~]# kubectl certificate approve csr-wsfz7
[root@master ~]# kubectl get certificatesigningrequests
NAME        AGE   REQUESTOR            CONDITION
csr-wsfz7   86s   system:node:master   Approved,Issued

安装mertics插件

[root@master metrics]# docker load -i metrisc-server.tar.gz
[root@master metrics]# docker tag gcr.io/k8s-staging-metrics-server/metrics-server:master 192.168.1.100:5000/metrics-server:master
[root@master metrics]# docker push 192.168.1.100:5000/metrics-server:master
[root@master metrics]# vim deployment.yaml
29： image: 192.168.1.100:5000/metrics-server:master
[root@master metrics]# kubectl apply -f rbac.yaml
[root@master metrics]# kubectl apply -f pdb.yaml
[root@master metrics]# kubectl apply -f deployment.yaml
[root@master metrics]# kubectl apply -f service.yaml
[root@master metrics]# kubectl apply -f apiservice.yaml
#-------------------------------- 查询验证 ----------------------------------------------
[root@master metrics]# kubectl -n kube-system get pod
NAME                              READY   STATUS    RESTARTS   AGE
metrics-server-78dfb54777-4dcjl   1/1     Running   0          116s
[root@master metrics]# kubectl -n kube-system get apiservices
NAME                                   SERVICE                      AVAILABLE   AGE
v1beta1.metrics.k8s.io                 kube-system/metrics-server   True        2m20s
[root@master metrics]# kubectl top node
NAME        CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%   
master      95m          4%     840Mi           48%       
node-0001   24m          1%     266Mi           15%       
node-0002   24m          1%     270Mi           15%       
node-0003   26m          1%     280Mi           16%   

监控容器资源利用率

[root@master ~]# kubectl apply -f myapache.yaml 
deployment.apps/myapache created
[root@master ~]# kubectl top pod
error: metrics not available yet
# 等待大约 30 秒
[root@master ~]# kubectl top pod
NAME                       CPU(cores)   MEMORY(bytes)   
myapache-7d689bf8f-lfr5h   0m           0Mi   
[root@master ~]# curl http://10.244.2.17/info.php?id=5000000
<pre>
Array
(
    [REMOTE_ADDR] => 10.244.0.0
    [REQUEST_METHOD] => GET
    [HTTP_USER_AGENT] => curl/7.29.0
    [REQUEST_URI] => /info.php?id=5000000
    [id] => 5000000
)
php_host:   myapache-7d689bf8f-lfr5h
[root@master ~]# kubectl top pod
NAME                       CPU(cores)   MEMORY(bytes)   
myapache-7d689bf8f-w4rtt   1000m        8Mi  
[root@master ~]# 

作者：一个小运维
链接：https://www.jianshu.com/p/d94b73050d46

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