2.8 测试集群
创建一个 deployment 和 service 进行测试
kubectl create deployment nginx --image=nginx:1.20.1-alpine
kubectl expose deployment/nginx --name=nginx --port=80 --type=NodePort
kubectl get po
输出如下
NAME READY STATUS RESTARTS AGE
nginx-779c9459b8-dp4tq 0/1 Pending 0 22s
查看描述
kubectl describe po nginx-779c9459b8-dp4tq
Warning FailedScheduling 46s default-scheduler 0/3 nodes are available: 3 node(s) had taint {node-role.kubernetes.io/master: }, that the pod didn't tolerate.
因为这里的实验环境 3 台 master 节点，同时充当 worker 节点使用，生产环境建议保留，使用单独的 worker 节点来调度。
需要把 master 标签和污点去掉，默认 master 无法调度
去除 master 标签
kubectl label node k8s-m1 node-role.kubernetes.io/master-
kubectl label node k8s-m2 node-role.kubernetes.io/master-
kubectl label node k8s-m3 node-role.kubernetes.io/master-
去除污点
kubectl taint node k8s-m1 node-role.kubernetes.io/master:NoSchedule-
kubectl taint node k8s-m2 node-role.kubernetes.io/master:NoSchedule-
kubectl taint node k8s-m3 node-role.kubernetes.io/master:NoSchedule-
再次检查，已经正常调度到 master 节点了
kubectl get po
NAME READY STATUS RESTARTS AGE
nginx-779c9459b8-dp4tq 0/1 ContainerCreating 0 2m4s
查看 pod 和 service
kubectl get svc -l app=nginx
输出如下
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
nginx NodePort 10.100.168.172 <none> 80:30009/TCP 2m5s
访问测试
curl 10.100.168.172
输出如下
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
查看 ipvs 规则
ipvsadm -L -n
输出如下
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 172.17.0.1:30009 rr
-> 10.244.42.129:80 Masq 1 0 0
TCP 192.168.122.10:30009 rr
-> 10.244.42.129:80 Masq 1 0 0
TCP 10.96.0.1:443 rr
-> 192.168.122.10:6443 Masq 1 1 0
-> 192.168.122.20:6443 Masq 1 1 0
-> 192.168.122.30:6443 Masq 1 2 0
TCP 10.96.0.10:53 rr
-> 10.244.11.1:53 Masq 1 0 0
-> 10.244.11.2:53 Masq 1 0 0
TCP 10.96.0.10:9153 rr
-> 10.244.11.1:9153 Masq 1 0 0
-> 10.244.11.2:9153 Masq 1 0 0
TCP 10.100.168.172:80 rr
-> 10.244.42.129:80 Masq 1 0 1
TCP 10.244.42.128:30009 rr
-> 10.244.42.129:80 Masq 1 0 0
UDP 10.96.0.10:53 rr
-> 10.244.11.1:53 Masq 1 0 0
-> 10.244.11.2:53 Masq 1 0 0
看到上面的，说明已经正常使用 ipvs 模式了。