#云原生征文#k8s高可用三台master部署 图文并茂 原创

每台机器都要部署nginx

1.前提：k8s相关服务必须安装完

关闭每台机器防火墙,postfix，selinux，swap

systemctl disable postfix && systemctl stop postfix
setenforce 0 && sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
swapoff -a && sed -i 's/.*swap.*/#&/' /etc/fstab

修改k8s文件，将桥接的IPv4流量传递到iptables的链

cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
# 生效
sysctl --system  

安装配置docker

mkdir -p /etc/docker/

vim /etc/docker/daemon.json
#添加如下配置
{
    "hosts":[
        "tcp://0.0.0.0:9998",
        "unix:///var/run/docker.sock"
    ],
    "insecure-registries":["192.168.146.101:5005"],
    "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
yum install -y yum-utils


yum-config-manager --add-repo https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/centos/docker-ce.repo


yum install -y docker-ce docker-ce-cli containerd.io

systemctl enable docker && systemctl start docker

配置kubernetes源

vim /etc/yum.repos.d/kubernetes.repo
#添加如下配置
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

安装kubeadm，kubelet和kubectl

yum install -y kubelet-1.18.6 kubeadm-1.18.6 kubectl-1.18.6

systemctl enable kubelet

k8s三台master部署

10.0.0.128​

10.0.0.215​

10.0.0.29​

重新生成新的api-server证书​

在master节点下执行下列操作：​

# 导出线上kubeadm配置​

kubectl -n kube-system get configmap kubeadm-config -o jsonpath='{.data.ClusterConfiguration}' > kubeadm.yaml​

​

增加apiServer参数certSANs​

apiServer:​

certSANs:​

- localhost​

- 10.​

- 10.​

- 10.​

- hw-​

- hw-​

- hw-​

extraArgs:​

authorization-mode: Node,RBAC​

timeoutForControlPlane: 4m0s​

apiVersion: kubeadm.k8s.io/v1beta2​

certificatesDir: /etc/kubernetes/pki​

clusterName: kubernetes​

controllerManager: {}​

dns:​

type: CoreDNS​

etcd:​

local:​

dataDir: /var/lib/etcd​

imageRepository: registry.aliyuncs.com/google_containers​

kind: ClusterConfiguration​

kubernetesVersion: v1.18.6​

networking:​

dnsDomain: cluster.local​

podSubnet: 10.244.0.0/16​

serviceSubnet: 10.96.0.0/12​

scheduler: {}​

更新证书

#把整个/etc/kubernetes做备份​

cp -r /etc/kubernetes ~/backups​

​

#删除老的api-server证书​

rm /etc/kubernetes/pki/apiserver.{crt,key}​

​

#直接使用 kubeadm 命令生成一个新的证书​

kubeadm init phase certs apiserver --config kubeadm.yaml​

​

#重启 APIServer 来接收新的证书，最简单的方法是直接杀死 APIServer 的容器​

docker kill $(docker ps | grep kube-apiserver | grep -v pause | cut -d' ' -f1)​

#验证证书​

openssl x509 -in /etc/kubernetes/pki/apiserver.crt -text​

#将上面的集群配置信息保存到集群的 kubeadm-config 这个 ConfigMap 中去​

kubeadm config upload from-file --config kubeadm.yaml​

#验证是否保存成功​

kubectl -n kube-system get configmap kubeadm-config -o yaml​

负载均衡​
k8s高可用部署​已部署完k8s相关操作​
在所有节点上执行如下操作：​

安装组件nginx、keepalived​

yum install nginx keepalived -y​

在所有节点上使用 nginx 来作为一个负载均衡器​

vim /etc/kubernetes/nginx.conf​

添加如下内容​

error_log stderr notice;​


worker_processes 2;​

worker_rlimit_nofile 130048;​

worker_shutdown_timeout 10s;​


events {​

multi_accept on;​

use epoll;​

worker_connections 16384;​

}​


stream {​

upstream kube_apiserver {​

least_conn;​

server 10.4.46.215:6443;​

server 10.4.46.128:6443;​

server 10.4.46.29:6443;​

}​


server {​

listen 8443;​

proxy_pass kube_apiserver;​

proxy_timeout 10m;​

proxy_connect_timeout 1s;​

}​

}​


http {​

aio threads;​

aio_write on;​

tcp_nopush on;​

tcp_nodelay on;​


keepalive_timeout 5m;​

keepalive_requests 100;​

reset_timedout_connection on;​

server_tokens off;​

autoindex off;​


server {​

listen 8081;​

location /stub_status {​

stub_status on;​

access_log off;​

}​

}​

}​

部署keepalived服务​

yum install keepalived -y​

2.更新master节点配置​
**修改 kubelet 配置：**​

vim /etc/kubernetes/kubelet.conf​

将原有的ip改成nginx的代理配置​

......​

server: https://localhost:8443​

name: kubernetes​

......​
![4.png](https://dl-harmonyos.51cto.com/images/202205/419c4bd93d7fdc0993f79045b98aceb501e699.png?x-oss-process=image/resize,w_466,h_102)

![5.png](https://dl-harmonyos.51cto.com/images/202205/3645b5b516bef139eea973d08a475a2b17f157.png?x-oss-process=image/resize,w_554,h_49)

重启服务​

systemctl restart kubelet​

**修改 controller-manager 配置：**​

vim /etc/kubernetes/controller-manager.conf​

将原有的ip改成nginx的代理配置​

......​

server: https://localhost:8443​

name: kubernetes​

......​

重启服务​

docker kill $(docker ps | grep kube-controller-manager | grep -v pause | cut -d' ' -f1)​

**修改 scheduler 配置：**​

vim /etc/kubernetes/scheduler.conf​

将原有的ip改成nginx的代理配置​

......​

server: https://localhost:8443​

name: kubernetes​

......​

重启服务​

docker kill $(docker ps | grep kube-scheduler | grep -v pause | cut -d' ' -f1)​

更新kube客户端配置​

vim ~/.kube/config​

将原有的ip改成nginx的代理配置​

......​

server: https://localhost:8443​

name: kubernetes​

......​

更新 kube-proxy 配置​

kubectl -n kube-system edit cm kube-proxy​

将原有的ip改成nginx的代理配置​

......​

kubeconfig.conf: |-​

apiVersion: v1​

kind: Config​

clusters:​

- cluster:​

certificate-authority: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt​

server: https://localhost:8443​

name: default​

......​
![8.png](https://dl-harmonyos.51cto.com/images/202205/d702886337471479ebf612690302303b93239b.png?x-oss-process=image/resize,w_525,h_182)

重启各个节点的 kube-proxy​

3.更新控制平面(master)配置​
从集群中的 ConfigMap 中获取当前配置​

kubectl -n kube-system get configmap kubeadm-config -o jsonpath='{.data.ClusterConfiguration}' > kubeadm.yaml​

然后在当前配置文件里面里面添加 controlPlaneEndpoint 属性，用于指定控制面板的负载均衡器的地址。​

controlPlaneEndpoint: localhost:8443 #在首行添加该配置​

使用以下命令将其上传回集群​

kubeadm config upload from-file --config kubeadm.yaml​

然后需要在 kube-public 命名空间中更新 cluster-info 这个 ConfigMap，该命名空间包含一个Kubeconfig 文件，该文件的 server: 一行指向单个控制平面节点。只需使用kubectl -n kube-public edit cm cluster-info 更新该 server: 行以指向控制平面的负载均衡器即可。​

kubectl -n kube-public edit cm cluster-info​

将原有的ip改成nginx的代理配置​

......​

server: https://localhost:8443​

name: ""​

......​

更新完成就可以看到 cluster-info 的信息变成了负载均衡器的地址了。​

kubectl cluster-info​

4.生成token​
kubeadm init phase upload-certs --upload-certs​

kubeadm token create --print-join-command --config kubeadm.yaml​

5.添加master节点​
kubeadm reset​

rm -rf /var/lib/etcd​

kubeadm join localhost:8443 --token 4pi1b4.ngn8krw0aonwpnzd --discovery-token-ca-cert-hash sha256:e94427a152103d795535f5ec783f5f4dbaf2f92419682326d8716332d493f683 --control-plane --certificate-key 653c8a46198e675bee0b7b0183049b7e9ee08a2ff567bc5c36b82c28553ad484​

6.修改etcd组件配置​
登录各个master节点，修改etcd配置​

vim /etc/kubernetes/manifests/etcd.yaml​

增加所有master的连接​

…​

• –initial-cluster=hw-prd-dtp-hue-server-10-4-46-215=https://10.4.46.215:2380,hw-prd-dtp-k8s-master-10-4-46-128=https://10.4.46.128:2380,hw-prd-dtp-k8s-master-10-4-46-29=https://10.4.46.29:2380​
  
  
  …​