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使用kube-vip搭建高可用kubernetes集群,并结合metallb作为worker节点的LB

时间：2021-07-05 18:19:40   收藏：0   阅读：0

本篇内容参考:

CNCF: https://mp.weixin.qq.com/s?__biz=MzI5ODk5ODI4Nw==&mid=2247502809&idx=4&sn=df581ea3008dffdd2cc3a035934a4ffd&chksm=ec9fc4b9dbe84daf224aa558315690df554fe87d60f482f8d318417b069a1a51c704ca576fc2&mpshare=1&scene=1&srcid=06176PXuhkB6GEAI9yteZNWt&sharer_sharetime=1623904467161&sharer_shareid=65c2b33f0edcd044f978b8c04e432df8&version=3.1.8.3108&platform=win#rd
https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/
https://kube-vip.io/hybrid/static/  &&  https://kube-vip.io/hybrid/
https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm-init/*
https://metallb.universe.tf/installation/*
https://metallb.universe.tf/configuration/*

kube-vip可以提供控制平面节点提供原k8s原生的ha负载均衡,用来替换原来的haproxy和keepalived
kube-vip有两种模式
? 1.ARP第二层
? 2.BGP
本次kube-vip作为静态pod的方式提供服务,需要在所有master节点的/etc/kubernetes/manifests目录下提供kube-vip.yaml的文件
并且在测试中ARP的延迟在0.2-0.4ms之间,BGP测试在0.02-0.06ms之间,故模式选择BGP的方式

简单拓扑

技术图片

K8S安装系统准备

基础架构

系统版本: ubuntu18.04
kube-vip 版本:docker.io/plndr/kube-vip:0.3.1
docker 版本: 19.03.15
CNI版本: flannel v0.14.0
metallb版本:v0.10.2

节点 地址
kube-vip 192.168.51.93
master01 192.168.51.90
master02 192.168.51.91
master03 192.168.51.92
metallb-vip 192.168.51.95-192.168.51.99

系统基础配置

参考文档:https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/

安装运行时

这里选择使用docker

卸载旧版本
sudo apt-get remove docker docker-engine docker.io containerd runc -y
安装依赖包

sudo apt-get update

sudo apt-get install -y apt-transport-https ca-certificates curl gnupg lsb-release

添加官方GPG秘钥

curl -fsSL https://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add -

添加阿里云的稳定存储库

add-apt-repository "deb [arch=amd64] https://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"

sudo apt update

查看镜像版本号及安装指定版本docker-ce

apt-cache showpkg (docker-ce docker-ce-cli)

apt install -y docker-ce=5:19.03.153-0ubuntu-bionic docker-ce-cli=5:19.03.153-0ubuntu-bionic

检查是否安装成功

docker version

root@master01:~# docker version 
Client: Docker Engine - Community
 Version:           19.03.15
 API version:       1.40
 Go version:        go1.13.15
 Git commit:        99e3ed8919
 Built:             Sat Jan 30 03:16:51 2021
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.15
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.15
  Git commit:       99e3ed8919
  Built:            Sat Jan 30 03:15:20 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.4.6
  GitCommit:        d71fcd7d8303cbf684402823e425e9dd2e99285d
 runc:
  Version:          1.0.0-rc95
  GitCommit:        b9ee9c6314599f1b4a7f497e1f1f856fe433d3b7
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683
修改docker配置
#kubernetes 官方建议 docker 驱动采用 systemd，当然可以不修改，只是kubeadm init时会有warning提示
# 设置 Docker daemon
cat <<EOF | sudo tee /etc/docker/daemon.conf
{
 "registry-mirrors": [
    "https://dr6xf1z7.mirror.aliyuncs.com",
  ],
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF

sudo systemctl enable docker --now

基础配置

关闭防火墙和swap

sudo ufw disable

将swap那行注释
cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use ‘blkid‘ to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/ubuntu-vg/ubuntu-lv during curtin installation
/dev/disk/by-id/dm-uuid-LVM-222WfDSTn9UIXqknqY7xQRliXV4en2e2tg4MmIvkJq6f2JpN80kNhe6ZOnwTkcPU / ext4 defaults 0 0
# /boot was on /dev/sda2 during curtin installation
/dev/disk/by-uuid/459839de-cc1d-4317-bc9f-db8c6ac15fff /boot ext4 defaults 0 0
#/swap.img      none    swap    sw      0       0

sudo swapoff -a

使iptables看到桥接流量
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sudo sysctl --system
确保iptables工具不适用nftalbes后端

在 Linux 中，nftables 当前可以作为内核 iptables 子系统的替代品。 iptables 工具可以充当兼容性层，其行为类似于 iptables 但实际上是在配置 nftables。 nftables 后端与当前的 kubeadm 软件包不兼容：它会导致重复防火墙规则并破坏 kube-proxy。

如果您系统的 iptables 工具使用 nftables 后端，则需要把 iptables 工具切换到“旧版”模式来避免这些问题。 默认情况下，至少在 Debian 10 (Buster)、Ubuntu 19.04、Fedora 29 和较新的发行版本中会出现这种问题。RHEL 8 不支持切换到旧版本模式，因此与当前的 kubeadm 软件包不兼容。

update-alternatives --set iptables /usr/sbin/iptables-legacy
update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
update-alternatives --set arptables /usr/sbin/arptables-legacy
update-alternatives --set ebtables /usr/sbin/ebtables-legacy
修改主机名更新hosts

sudo hostnamectl set-hostname <hostname(master01)>

sudo  vi /etc/hosts
192.168.51.90 master01
192.168.51.91 master02
192.168.51.92 master03
192.168.51.93 kube-vip
安装kubeadm,kubectl,kubelet

curl -fsSL https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | apt-key add -

cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
EOF

sudo apt install kubelet=1.20.0-00 kubeadm=1.20.0-00 kubectl=1.20.0-00 -y

查看是否安装成功

kubectl version

kubeadm version

kubelet version

添加命令自动补全

apt install -y bash-completion

source /usr/share/bash-completion/bash_completion

echo ‘source <(kubectl completion bash)‘ >>~/.bashrc

kubectl completion bash >/etc/bash_completion.d/kubectl

修改kubectl别名

echo ‘alias k=kubectl‘ >>~/.bashrc
echo ‘complete -F __start_kubectl k‘ >>~/.bashrc

完成系统基础配置,下一步开始部署带kube-vip的k8s集群

初始化k8smaster节点及kube-vip部署

初始化master01节点

1.master01添加kube-vip的配置文件

参考: https://kube-vip.io/hybrid/static/ && https://kube-vip.io/hybrid/

export VIP=192.168.51.93
export INTERFACE=lo
docker pull docker.io/plndr/kube-vip:0.3.1
alias kube-vip="docker run --network host --rm plndr/kube-vip:0.3.1"
kube-vip manifest pod     --interface $INTERFACE     --vip $VIP     --controlplane     --services     --bgp     --localAS 65000     --bgpRouterID 192.168.51.90     --bgppeers 192.168.51.91:65000::false,192.168.51.92:65000::false |tee /etc/kubernetes/manifests/kube-vip.yaml
2. 使用kubeadm初始化master01节点

kubeadm init参数参考:https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm-init/

kubeadm init -apiserver-advertise-address 192.168.51.90 --apiserver-bind-port 6443 --pod-network-cidr 172.16.0.0/16 --upload-certs --image-repository registry.aliyuncs.com/google_containers

这里的--pod-network-cidr最好是直接规划好。并设置，不然后续还需要修改/etc/kubernetes/manifests/kube-controller-manager.yaml这个配置文件添加--allocate-node-cidrs=true --cluster-cidr=10.244.0.0/16此配置

看到以下提示表示安装完成:

[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

You can now join any number of the control-plane node running the following command on each as root:

  kubeadm join 192.168.51.93:6443 --token 7fjfc3.fgxtoz2mxbe87nbg     --discovery-token-ca-cert-hash sha256:2f98bba56738c501d4229a11226119da8b8e568a5ef7679091cdf614128c855e     --control-plane --certificate-key b8bf4f98b5403555eff663acb3d6b7374703fc37b4d199ccadde08aabe36ba6f

Please note that the certificate-key gives access to cluster sensitive data, keep it secret!
As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use
"kubeadm init phase upload-certs --upload-certs" to reload certs afterward.

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.51.93:6443 --token 7fjfc3.fgxtoz2mxbe87nbg     --discovery-token-ca-cert-hash sha256:2f98bba56738c501d4229a11226119da8b8e568a5ef7679091cdf614128c855e

检查网络是否生效

kubectl cluster-info dump | grep -m 1 cluster-cidr

添加master02和master03节点

通过系统初始化之后,执行master01节点执行kubeadm init生成的以下内容:

kubeadm join 192.168.51.93:6443 --token 7fjfc3.fgxtoz2mxbe87nbg
--discovery-token-ca-cert-hash sha256:2f98bba56738c501d4229a11226119da8b8e568a5ef7679091cdf614128c855e
--control-plane --certificate-key b8bf4f98b5403555eff663acb3d6b7374703fc37b4d199ccadde08aabe36ba6f

执行完成后则两个节点已经添加到了集群.

因为kube-vip是静态pod安装的需要在master02和master03节点的/etc/kubernetes/manifests/目录下添加kube-vip.yaml文件

master02:

export VIP=192.168.51.93
export INTERFACE=lo
docker pull docker.io/plndr/kube-vip:0.3.1
alias kube-vip="docker run --network host --rm plndr/kube-vip:0.3.1"
kube-vip manifest pod     --interface $INTERFACE     --vip $VIP     --controlplane     --services     --bgp     --localAS 65000     --bgpRouterID 192.168.51.91     --bgppeers 192.168.51.90:65000::false,192.168.51.92:65000::false |tee /etc/kubernetes/manifests/kube-vip.yaml

master03:

export VIP=192.168.51.93
export INTERFACE=lo
docker pull docker.io/plndr/kube-vip:0.3.1
alias kube-vip="docker run --network host --rm plndr/kube-vip:0.3.1"
kube-vip manifest pod     --interface $INTERFACE     --vip $VIP     --controlplane     --services     --bgp     --localAS 65000     --bgpRouterID 192.168.51.92     --bgppeers 192.168.51.90:65000::false,192.168.51.91:65000::false |tee /etc/kubernetes/manifests/kube-vip.yaml

文件添加完成后理论上kubelet会检查文件夹是否有变化,自动生成pod,若是没有生成则使用命令:

kubectl apply -f /etc/kubernetes/manifests/kube-vipo.yaml

至此master节点安装完毕,不过集群应该还是notready的状态,还需要安装CNI插件"可用有flannel,calico,weave"等插件

添加CNI插件

此步骤非常简单直接执行官方的一个yml文档就好了

https://raw.githubusercontent.com/coreos/flannel//Documentation/kube-flannel.yml

参看最新版本:https://github.com/flannel-io/flannel/tags

本次选择最新的版本v0.14.0

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.14.0/Documentation/kube-flannel.yml

完成flannel安装后,集群节点状态变成为ready

metallb部署

kubectl taint node --all node-role.kubernetes.io/master-

部署

参考文档:https://metallb.universe.tf/installation/

1.增加namespaces --metallb-system

kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.10.2/manifests/namespace.yaml

kind: Namespace
metadata:
  name: metallb-system
  labels:
    app: metallb

2.添加DaemonSet以及权限

kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.10.2/manifests/metallb.yaml

kind: PodSecurityPolicy
metadata:
  labels:
    app: metallb
  name: controller
  namespace: metallb-system
spec:
  allowPrivilegeEscalation: false
  allowedCapabilities: []
  allowedHostPaths: []
  defaultAddCapabilities: []
  defaultAllowPrivilegeEscalation: false
  fsGroup:
    ranges:
    - max: 65535
      min: 1
    rule: MustRunAs
  hostIPC: false
  hostNetwork: false
  hostPID: false
  privileged: false
  readOnlyRootFilesystem: true
  requiredDropCapabilities:
  - ALL
  runAsUser:
    ranges:
    - max: 65535
      min: 1
    rule: MustRunAs
  seLinux:
    rule: RunAsAny
  supplementalGroups:
    ranges:
    - max: 65535
      min: 1
    rule: MustRunAs
  volumes:
  - configMap
  - secret
  - emptyDir
---
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  labels:
    app: metallb
  name: speaker
  namespace: metallb-system
spec:
  allowPrivilegeEscalation: false
  allowedCapabilities:
  - NET_RAW
  allowedHostPaths: []
  defaultAddCapabilities: []
  defaultAllowPrivilegeEscalation: false
  fsGroup:
    rule: RunAsAny
  hostIPC: false
  hostNetwork: true
  hostPID: false
  hostPorts:
  - max: 7472
    min: 7472
  - max: 7946
    min: 7946
  privileged: true
  readOnlyRootFilesystem: true
  requiredDropCapabilities:
  - ALL
  runAsUser:
    rule: RunAsAny
  seLinux:
    rule: RunAsAny
  supplementalGroups:
    rule: RunAsAny
  volumes:
  - configMap
  - secret
  - emptyDir
---
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    app: metallb
  name: controller
  namespace: metallb-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    app: metallb
  name: speaker
  namespace: metallb-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    app: metallb
  name: metallb-system:controller
rules:
- apiGroups:
  - ‘‘
  resources:
  - services
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ‘‘
  resources:
  - services/status
  verbs:
  - update
- apiGroups:
  - ‘‘
  resources:
  - events
  verbs:
  - create
  - patch
- apiGroups:
  - policy
  resourceNames:
  - controller
  resources:
  - podsecuritypolicies
  verbs:
  - use
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    app: metallb
  name: metallb-system:speaker
rules:
- apiGroups:
  - ‘‘
  resources:
  - services
  - endpoints
  - nodes
  verbs:
  - get
  - list
  - watch
- apiGroups: ["discovery.k8s.io"]
  resources:
  - endpointslices
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ‘‘
  resources:
  - events
  verbs:
  - create
  - patch
- apiGroups:
  - policy
  resourceNames:
  - speaker
  resources:
  - podsecuritypolicies
  verbs:
  - use
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  labels:
    app: metallb
  name: config-watcher
  namespace: metallb-system
rules:
- apiGroups:
  - ‘‘
  resources:
  - configmaps
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  labels:
    app: metallb
  name: pod-lister
  namespace: metallb-system
rules:
- apiGroups:
  - ‘‘
  resources:
  - pods
  verbs:
  - list
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  labels:
    app: metallb
  name: controller
  namespace: metallb-system
rules:
- apiGroups:
  - ‘‘
  resources:
  - secrets
  verbs:
  - create
- apiGroups:
  - ‘‘
  resources:
  - secrets
  resourceNames:
  - memberlist
  verbs:
  - list
- apiGroups:
  - apps
  resources:
  - deployments
  resourceNames:
  - controller
  verbs:
  - get
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    app: metallb
  name: metallb-system:controller
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: metallb-system:controller
subjects:
- kind: ServiceAccount
  name: controller
  namespace: metallb-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    app: metallb
  name: metallb-system:speaker
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: metallb-system:speaker
subjects:
- kind: ServiceAccount
  name: speaker
  namespace: metallb-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    app: metallb
  name: config-watcher
  namespace: metallb-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: config-watcher
subjects:
- kind: ServiceAccount
  name: controller
- kind: ServiceAccount
  name: speaker
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    app: metallb
  name: pod-lister
  namespace: metallb-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: pod-lister
subjects:
- kind: ServiceAccount
  name: speaker
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    app: metallb
  name: controller
  namespace: metallb-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: controller
subjects:
- kind: ServiceAccount
  name: controller
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  labels:
    app: metallb
    component: speaker
  name: speaker
  namespace: metallb-system
spec:
  selector:
    matchLabels:
      app: metallb
      component: speaker
  template:
    metadata:
      annotations:
        prometheus.io/port: ‘7472‘
        prometheus.io/scrape: ‘true‘
      labels:
        app: metallb
        component: speaker
    spec:
      containers:
      - args:
        - --port=7472
        - --config=config
        env:
        - name: METALLB_NODE_NAME
          valueFrom:
            fieldRef:
              fieldPath: spec.nodeName
        - name: METALLB_HOST
          valueFrom:
            fieldRef:
              fieldPath: status.hostIP
        - name: METALLB_ML_BIND_ADDR
          valueFrom:
            fieldRef:
              fieldPath: status.podIP
        # needed when another software is also using memberlist / port 7946
        # when changing this default you also need to update the container ports definition
        # and the PodSecurityPolicy hostPorts definition
        #- name: METALLB_ML_BIND_PORT
        #  value: "7946"
        - name: METALLB_ML_LABELS
          value: "app=metallb,component=speaker"
        - name: METALLB_ML_SECRET_KEY
          valueFrom:
            secretKeyRef:
              name: memberlist
              key: secretkey
        image: quay.io/metallb/speaker:v0.10.2
        name: speaker
        ports:
        - containerPort: 7472
          name: monitoring
        - containerPort: 7946
          name: memberlist-tcp
        - containerPort: 7946
          name: memberlist-udp
          protocol: UDP
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            add:
            - NET_RAW
            drop:
            - ALL
          readOnlyRootFilesystem: true
      hostNetwork: true
      nodeSelector:
        kubernetes.io/os: linux
      serviceAccountName: speaker
      terminationGracePeriodSeconds: 2
      tolerations:
      - effect: NoSchedule
        key: node-role.kubernetes.io/master
        operator: Exists
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: metallb
    component: controller
  name: controller
  namespace: metallb-system
spec:
  revisionHistoryLimit: 3
  selector:
    matchLabels:
      app: metallb
      component: controller
  template:
    metadata:
      annotations:
        prometheus.io/port: ‘7472‘
        prometheus.io/scrape: ‘true‘
      labels:
        app: metallb
        component: controller
    spec:
      containers:
      - args:
        - --port=7472
        - --config=config
        env:
        - name: METALLB_ML_SECRET_NAME
          value: memberlist
        - name: METALLB_DEPLOYMENT
          value: controller
        image: quay.io/metallb/controller:v0.10.2
        name: controller
        ports:
        - containerPort: 7472
          name: monitoring
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            drop:
            - all
          readOnlyRootFilesystem: true
      nodeSelector:
        kubernetes.io/os: linux
      securityContext:
        runAsNonRoot: true
        runAsUser: 65534
      serviceAccountName: controller
      terminationGracePeriodSeconds: 0

3.配置configmap.yaml

参考文档:https://metallb.universe.tf/configuration/

本次实验选择的是二层配置,修改下addresses的地址范围就行了

apiVersion: v1
kind: ConfigMap
metadata:
  namespace: metallb-system
  name: config
data:
  config: |
    address-pools:
    - name: default
      protocol: layer2
      addresses:
      - 192.168.51.95-192.168.51.99

4.测试是否成功能获取到ip并访问

部署nginx

kubectl create deploy nginx --image nginx

root@master01:~# kubectl create  deploy nginx --image nginx  
deployment.apps/nginx created
root@master01:~# kubectl get pods 
NAME                     READY   STATUS              RESTARTS   AGE
nginx-6799fc88d8-22ppr   0/1     ContainerCreating   0          19s
root@master01:~# kubectl get pods 
NAME                     READY   STATUS    RESTARTS   AGE
nginx-6799fc88d8-22ppr   1/1     Running   0          27s
部署LoadBalancer模式的expose

kubectl expose deploy --port 80 nginx --type LoadBalancer

root@master01:~# kubectl get all 
NAME                         READY   STATUS    RESTARTS   AGE
pod/nginx-6799fc88d8-22ppr   1/1     Running   0          2m11s

NAME                 TYPE           CLUSTER-IP    EXTERNAL-IP     PORT(S)        AGE
service/kubernetes   ClusterIP      10.96.0.1     <none>          443/TCP        5d3h
service/nginx        LoadBalancer   10.106.82.7   192.168.51.95   80:32579/TCP   47s

NAME                    READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx   1/1     1            1           2m11s

NAME                               DESIRED   CURRENT   READY   AGE
replicaset.apps/nginx-6799fc88d8   1         1         1       2m11s

可以发现svc里面的service/nginx获取到了external-IP的地址192.168.51.95
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