|NO.Z.00087|——————————|^^ 部署 ^^|——|KuberNetes&kubeadm.V16|5台Server|——|kubernetes验证|集群可用性验证|
一、集群可用性验证：查看现有资源信息
### --- 查询集群中所有namespace下的容器
[root@k8s-master01 ~]# kubectl get po --all-namespaces -owide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system calico-kube-controllers-cdd5755b9-9dtk4 1/1 Running 0 3m38s 192.168.1.11 k8s-master01 <none> <none>
kube-system calico-node-jsprh 1/1 Running 0 107m 192.168.1.12 k8s-master02 <none> <none>
kube-system calico-node-n97ff 1/1 Running 0 107m 192.168.1.11 k8s-master01 <none> <none>
kube-system calico-node-tk4kz 1/1 Running 1 107m 192.168.1.15 k8s-node02 <none> <none>
kube-system calico-node-vfcxf 1/1 Running 0 107m 192.168.1.13 k8s-master03 <none> <none>
kube-system calico-node-wvwbh 1/1 Running 0 107m 192.168.1.14 k8s-node01 <none> <none>
kube-system coredns-6f6b8cc4f6-bxsh9 1/1 Running 0 3m38s 172.162.195.2 k8s-master03 <none> <none>
kube-system coredns-6f6b8cc4f6-p55bx 1/1 Running 0 3m38s 172.162.195.1 k8s-master03 <none> <none>
kube-system etcd-k8s-master01 1/1 Running 0 173m 192.168.1.11 k8s-master01 <none> <none>
kube-system etcd-k8s-master02 1/1 Running 0 152m 192.168.1.12 k8s-master02 <none> <none>
kube-system etcd-k8s-master03 1/1 Running 0 137m 192.168.1.13 k8s-master03 <none> <none>
kube-system kube-apiserver-k8s-master01 1/1 Running 0 173m 192.168.1.11 k8s-master01 <none> <none>
kube-system kube-apiserver-k8s-master02 1/1 Running 0 152m 192.168.1.12 k8s-master02 <none> <none>
kube-system kube-apiserver-k8s-master03 1/1 Running 0 137m 192.168.1.13 k8s-master03 <none> <none>
kube-system kube-controller-manager-k8s-master01 1/1 Running 2 173m 192.168.1.11 k8s-master01 <none> <none>
kube-system kube-controller-manager-k8s-master02 1/1 Running 1 152m 192.168.1.12 k8s-master02 <none> <none>
kube-system kube-controller-manager-k8s-master03 1/1 Running 0 137m 192.168.1.13 k8s-master03 <none> <none>
kube-system kube-proxy-4shwt 1/1 Running 0 79m 192.168.1.12 k8s-master02 <none> <none>
kube-system kube-proxy-6n6z9 1/1 Running 0 80m 192.168.1.13 k8s-master03 <none> <none>
kube-system kube-proxy-7r4pk 1/1 Running 0 80m 192.168.1.14 k8s-node01 <none> <none>
kube-system kube-proxy-ddghx 1/1 Running 0 80m 192.168.1.11 k8s-master01 <none> <none>
kube-system kube-proxy-msb5v 1/1 Running 0 79m 192.168.1.15 k8s-node02 <none> <none>
kube-system kube-scheduler-k8s-master01 1/1 Running 2 173m 192.168.1.11 k8s-master01 <none> <none>
kube-system kube-scheduler-k8s-master02 1/1 Running 0 152m 192.168.1.12 k8s-master02 <none> <none>
kube-system kube-scheduler-k8s-master03 1/1 Running 1 137m 192.168.1.13 k8s-master03 <none> <none>
kube-system metrics-server-d6c46b546-fwktk 1/1 Running 0 3m28s 172.169.244.193 k8s-master01 <none> <none>
kubernetes-dashboard dashboard-metrics-scraper-86bb69c5f6-5mbh5 1/1 Running 0 3m38s 172.169.92.65 k8s-master02 <none> <none>
kubernetes-dashboard kubernetes-dashboard-6576c84894-snkjz 1/1 Running 0 3m28s 172.162.195.3 k8s-master03 <none> <none>### --- 查看pod检测数据
[root@k8s-master01 ~]# kubectl top po -n kube-system --use-protocol-buffers
NAME CPU(cores) MEMORY(bytes)
calico-kube-controllers-cdd5755b9-9dtk4 2m 12Mi
calico-node-jsprh 60m 44Mi
calico-node-n97ff 48m 44Mi
calico-node-tk4kz 64m 57Mi
calico-node-vfcxf 54m 51Mi
calico-node-wvwbh 72m 50Mi
coredns-6f6b8cc4f6-bxsh9 6m 22Mi
coredns-6f6b8cc4f6-p55bx 3m 17Mi
etcd-k8s-master01 62m 69Mi
etcd-k8s-master02 90m 73Mi
etcd-k8s-master03 55m 76Mi
kube-apiserver-k8s-master01 87m 324Mi
kube-apiserver-k8s-master02 81m 289Mi
kube-apiserver-k8s-master03 83m 300Mi
kube-controller-manager-k8s-master01 41m 59Mi
kube-controller-manager-k8s-master02 2m 26Mi
kube-controller-manager-k8s-master03 2m 31Mi
kube-proxy-4shwt 12m 17Mi
kube-proxy-6n6z9 20m 22Mi
kube-proxy-7r4pk 13m 16Mi
kube-proxy-ddghx 12m 19Mi
kube-proxy-msb5v 17m 19Mi
kube-scheduler-k8s-master01 4m 24Mi
kube-scheduler-k8s-master02 3m 24Mi
kube-scheduler-k8s-master03 5m 21Mi
metrics-server-d6c46b546-fwktk 4m 17Mi 二、验证pod之间是否通信
### --- 查看service地址及端口
~~~ 查看kubernetes.service地址及端口
[root@k8s-master01 ~]# kubectl get service -owide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 175m <none>### --- 查看kube-dns.service地址及端口
~~~ coredns的service是cluster.ip的第十个IP地址
[root@k8s-master01 ~]# kubectl get service -n kube-system -owide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP,9153/TCP 175m k8s-app=kube-dns
metrics-server ClusterIP 10.103.12.220 <none> 443/TCP 99m k8s-app=metrics-server### --- 验证service端口是否通信
~~~ 测试所有的宿主机是否与这两个地址是通的：所有节点执行
[root@k8s-master01 ~]# telnet 10.96.0.1 443
Trying 10.96.0.1...
Connected to 10.96.0.1.
Escape character is '^]'.[root@k8s-master01 ~]# telnet 10.96.0.10 53
Trying 10.96.0.10...
Connected to 10.96.0.10.
Escape character is '^]'.
Connection closed by foreign host.### --- 验证服务器与pod之间是否通信
~~~ 查看已有的pod服务
[root@k8s-master01 ~]# kubectl get po --all-namespaces -owide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system calico-node-n97ff 1/1 Running 0 117m 192.168.1.11 k8s-master01 <none> <none>
kube-system coredns-6f6b8cc4f6-bxsh9 1/1 Running 0 12m 172.162.195.2 k8s-master03 <none> <none>~~~ # 进入容器内部
~~~ 都是通的，说明pod跨主机访问是没有任何问题的
[root@k8s-master01 ~]# kubectl exec -ti calico-node-n97ff -n kube-system -- bash
[root@k8s-master01 ~]# ping 192.168.1.11
[root@k8s-master01 /]# ping 192.168.1.12
[root@k8s-master01 /]# ping 192.168.1.13
[root@k8s-master01 /]# ping 192.168.1.14
[root@k8s-master01 /]# ping 192.168.1.15### --- 验证pod与pod之间是否通信
~~~ # 查看已有的pod服务
[root@k8s-master01 ~]# kubectl get po --all-namespaces -owide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system calico-node-n97ff 1/1 Running 0 117m 192.168.1.11 k8s-master01 <none> <none>
kube-system coredns-6f6b8cc4f6-bxsh9 1/1 Running 0 12m 172.162.195.2 k8s-master03 <none> <none>~~~ # 验证master01的pod和master03的pod是否是通的
[root@k8s-master01 ~]# kubectl exec -ti calico-node-n97ff -n kube-system -- bash~~~ # ping.coredns-6f6b8cc4f6-bxsh9容器的地址
~~~ 说明pod和pod之间是通的
[root@k8s-master01 /]# ping 172.162.195.2
PING 172.162.195.2 (172.162.195.2) 56(84) bytes of data.
64 bytes from 172.162.195.2: icmp_seq=1 ttl=63 time=0.473 ms
64 bytes from 172.162.195.2: icmp_seq=2 ttl=63 time=1.42 msWalter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart
——W.S.Landor
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