“Kubernetes的负载均衡器真的能实现负载均衡吗？我忍不住要试一试。”

2 年 ago

文, 翔

3 minutes

你好，我是Class Act Infrastructures事业部的大塚先生。

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root@k8s-master:~# kubectl get pod -o wide
NAME                                    READY   STATUS    RESTARTS   AGE    IP             NODE           NOMINATED NODE   READINESS GATES
nginx-httpd-deployment-759b9b5f-vq8rp   2/2     Running   0          3h5m   10.1.235.209   k8s-master     <none>           <none>
nginx-httpd-deployment-759b9b5f-rsp86   2/2     Running   0          3h5m   10.1.79.68     k8s-worker01   <none>           <none>
nginx-httpd-deployment-759b9b5f-h8k67   2/2     Running   0          3h5m   10.1.69.197    k8s-worker02   <none>           <none>
root@k8s-master:~# kubectl exec -it nginx-httpd-deployment-759b9b5f-vq8rp -c web-httpd -- /bin/bash 
root@nginx-httpd-deployment-759b9b5f-vq8rp:/usr/local/apache2# cd /usr/local/apache2/htdocs
root@nginx-httpd-deployment-759b9b5f-vq8rp:/usr/local/apache2/htdocs# vi index.html
root@nginx-httpd-deployment-759b9b5f-vq8rp:/usr/local/apache2/htdocs# cat index.html
<html><body><h1>It works on master!!</h1></body></html>
root@nginx-httpd-deployment-759b9b5f-vq8rp:/usr/local/apache2/htdocs# /usr/local/apache2/bin/apachectl restart
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 10.1.235.209. Set the 'ServerName' directive globally to suppress this message

root@k8s-master:~# kubectl get pod -o wide 
NAME                                    READY   STATUS    RESTARTS   AGE    IP             NODE           NOMINATED NODE   READINESS GATES 
nginx-httpd-deployment-759b9b5f-vq8rp   2/2     Running   0          3h7m   10.1.235.209   k8s-master     <none>           <none> 
nginx-httpd-deployment-759b9b5f-rsp86   2/2     Running   0          3h7m   10.1.79.68     k8s-worker01   <none>           <none> 
nginx-httpd-deployment-759b9b5f-h8k67   2/2     Running   0          3h7m   10.1.69.197    k8s-worker02   <none>           <none> 
root@k8s-master:~# kubectl exec -it nginx-httpd-deployment-759b9b5f-rsp86 -c web-httpd -- /bin/bash 
root@nginx-httpd-deployment-759b9b5f-rsp86:/usr/local/apache2# cd /usr/local/apache2/htdocs 
root@nginx-httpd-deployment-759b9b5f-rsp86:/usr/local/apache2/htdocs# vi index.html 
root@nginx-httpd-deployment-759b9b5f-rsp86:/usr/local/apache2/htdocs# cat index.html 
<html><body><h1>It works on worker01!!</h1></body></html> 
root@nginx-httpd-deployment-759b9b5f-rsp86:/usr/local/apache2/htdocs# /usr/local/apache2/bin/apachectl restart 
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 10.1.79.68. Set the 'ServerName' directive globally to suppress this message

root@k8s-master:~# kubectl get pod -o wide 
NAME                                    READY   STATUS    RESTARTS   AGE    IP             NODE           NOMINATED NODE   READINESS GATES 
nginx-httpd-deployment-759b9b5f-vq8rp   2/2     Running   0          3h9m   10.1.235.209   k8s-master     <none>           <none> 
nginx-httpd-deployment-759b9b5f-rsp86   2/2     Running   0          3h9m   10.1.79.68     k8s-worker01   <none>           <none> 
nginx-httpd-deployment-759b9b5f-h8k67   2/2     Running   0          3h9m   10.1.69.197    k8s-worker02   <none>           <none> 
root@k8s-master:~# kubectl exec -it nginx-httpd-deployment-759b9b5f-h8k67 -c web-httpd -- /bin/bash 
root@nginx-httpd-deployment-759b9b5f-h8k67:/usr/local/apache2# cd /usr/local/apache2/htdocs 
root@nginx-httpd-deployment-759b9b5f-h8k67:/usr/local/apache2/htdocs# vi index.html 
root@nginx-httpd-deployment-759b9b5f-h8k67:/usr/local/apache2/htdocs# cat index.html 
<html><body><h1>It works on worker02!!</h1></body></html> 
root@nginx-httpd-deployment-759b9b5f-h8k67:/usr/local/apache2/htdocs# /usr/local/apache2/bin/apachectl restart 
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 10.1.69.197. Set the 'ServerName' directive globally to suppress this message

做实验

LoadBalancer工作正常，經多次連接發現即使使用相同的IP地址和埠號，輸出的內容也有所不同。