k8s部署-18-集群测试_vlambda技术博客

vlambda
2022-03-23

k8s部署-18-集群测试

通过这几篇文章，相信我们已经通过kubernetes-the-hard-way的方式，将k8s集群搭建成功了，那么如何进行验证呢？无非就是新建一个daemonset嘛，然后通过检测各种网络连通性验证，那么话不多说，直接来实操吧。

新建nginx的yaml文件

# 建立配置文件[root@node1 ~]# cat > nginx-ds.yml <<EOFapiVersion: v1kind: Servicemetadata: name: nginx-ds labels: app: nginx-dsspec: type: NodePort selector: app: nginx-ds ports: - name: http port: 80 targetPort: 80---apiVersion: apps/v1kind: DaemonSetmetadata: name: nginx-dsspec: selector: matchLabels: app: nginx-ds template: metadata: labels: app: nginx-ds spec: containers: - name: my-nginx image: nginx:1.19 ports: - containerPort: 80EOF[root@node1 ~]# # 生成daemonset[root@node1 ~]# kubectl apply -f nginx-ds.yml # 检查生成情况# 由于没有指定namespace，所以默认在default的命名空间中[root@node1 ~]# kubectl get podNAME READY STATUS RESTARTS AGEnginx-ds-m8wrf 1/1 Running 0 22snginx-ds-zc5qt 1/1 Running 0 22s[root@node1 ~]#

# 获取到pod的IP地址[root@node1 ~]# kubectl get pod -o wideNAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATESnginx-ds-m8wrf 1/1 Running 0 2m31s 10.200.135.3 node3 <none> <none>nginx-ds-zc5qt 1/1 Running 0 2m31s 10.200.104.2 node2 <none> <none>[root@node1 ~]# # 分别在node2和node3这两个worker节点上ping一下[root@node2 ~]# ping 10.200.135.3[root@node2 ~]# ping 10.200.104.2[root@node3 ~]# ping 10.200.135.3[root@node3 ~]# ping 10.200.104.2
# 检查svc的可达性[root@node1 ~]# kubectl get svcNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGEkubernetes ClusterIP 10.233.0.1 <none> 443/TCP 22hnginx-ds NodePort 10.233.127.233 <none> 80:30323/TCP 4m12s[root@node1 ~]# # 获取到IP为10.233.127.233# 然后在worker节点上分别curl一下，看看是否成功返回nginx界面。[root@node2 ~]# curl 10.233.127.233<!DOCTYPE html><html><head><title>Welcome to nginx!</title><style>html { color-scheme: light dark; }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 andworking. 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>[root@node2 ~]# # 再检查通过node的IP地址是否能通，使用如下命令，在worker节点上执行[root@node2 ~]# curl 10.200.135.3:80[root@node2 ~]# curl 10.200.104.2:80

检查dns

# 创建一个nginx的pod[root@node1 ~]# cat > pod-nginx.yaml <<EOFapiVersion: v1kind: Podmetadata: name: nginxspec: containers: - name: nginx image: docker.io/library/nginx:1.19 ports: - containerPort: 80EOF[root@node1 ~]# # 使配置生效[root@node1 ~]# kubectl apply -f pod-nginx.yaml pod/nginx created[root@node1 ~]# 
# 查看现在的pod[root@node1 ~]# kubectl get podNAME READY STATUS RESTARTS AGEnginx 1/1 Running 0 51snginx-ds-m8wrf 1/1 Running 0 9m11snginx-ds-zc5qt 1/1 Running 0 9m11s[root@node1 ~]# 
# 进入pod[root@node1 ~]# kubectl exec nginx -it -- /bin/bash
# 查看DNSroot@nginx:/# cat /etc/resolv.conf search default.svc.cluster.local svc.cluster.local cluster.local localdomainnameserver 169.254.25.10options ndots:5root@nginx:/# # 检查名字是否可以正常解析root@nginx:/# curl nginx-ds # 经过检测是可以的

日志功能

# 查看现在有的pod[root@node1 ~]# kubectl get podNAME READY STATUS RESTARTS AGEnginx 1/1 Running 0 3m55snginx-ds-m8wrf 1/1 Running 0 12mnginx-ds-zc5qt 1/1 Running 0 12m[root@node1 ~]# 
# 可以看到现在有3个pod，我们随机选择一个，查看下日志[root@node1 ~]# kubectl logs nginx/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d//docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh/docker-entrypoint.sh: Configuration complete; ready for start up2022/03/20 12:14:04 [notice] 1#1: using the "epoll" event method2022/03/20 12:14:04 [notice] 1#1: nginx/1.21.62022/03/20 12:14:04 [notice] 1#1: built by gcc 10.2.1 20210110 (Debian 10.2.1-6) 2022/03/20 12:14:04 [notice] 1#1: OS: Linux 3.10.0-862.el7.x86_642022/03/20 12:14:04 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:10485762022/03/20 12:14:04 [notice] 1#1: start worker processes2022/03/20 12:14:04 [notice] 1#1: start worker process 31[root@node1 ~]#

exec功能

[root@node1 ~]# kubectl get pods -l app=nginx-dsNAME READY STATUS RESTARTS AGEnginx-ds-m8wrf 1/1 Running 0 13mnginx-ds-zc5qt 1/1 Running 0 13m[root@node1 ~]# [root@node1 ~]# kubectl get pods -lError: flag needs an argument: 'l' in -lSee 'kubectl get --help' for usage.[root@node1 ~]# kubectl get pods -l app=nginx-dsNAME READY STATUS RESTARTS AGEnginx-ds-m8wrf 1/1 Running 0 13mnginx-ds-zc5qt 1/1 Running 0 13m[root@node1 ~]# kubectl exec -it nginx-ds-m8wrf -- nginx -vnginx version: nginx/1.21.6[root@node1 ~]#