一、准备工作

两台服务器:master:4C16G

                      node:4C8G

版本信息:

centos7.9
Docker20.10.24
Kubernetes1.28.1
Flannel0.25.1
二、系统初始化
2.1设置主机名及hosts文件(所有节点)
hostnamectl set-hostname k8s-master && bash
hostnamectl set-hostname k8s-node1 && bash
vim /etc/hosts
 
10.10.10.10 master
10.10.10.11 node1
2.2创建虚拟网卡(所有节点)
ifconfig eth0:1 10.10.10.10/22 netmask 255.255.252.0
ifconfig eth0:1 up




#但是按照上述方式修改,重启后会消失,需要修改以下配置
vi /etc/sysconfig/network-scripts/ifcfg-eth0:1
 

NAME=eth0:1
DEVICE=eth0:1
TYPE=Ethernet
ONBOOT=yes
BOOTPROTO=static
NETMASK=255.255.255.0
IPADDR=<public ip>
 
#查看是否创建成功
ip a | grep eth0 


#不同的机器添加虚拟网卡的命令有所区别  可根据情况自行搜索


2.3安装依赖文件(所有节点)

yum install -y conntrack ntpdate ntp ipvsadm ipset jq iptables curl sysstat libseccomp wget vim net-tools git

2.4关闭防火墙并配置iptables规则(所有节点)

systemctl stop firewalld && systemctl disable firewalld

yum -y install iptables-services && systemctl start iptables && systemctl enable iptables && iptables -F && service iptables save

2.5关闭selinux && swap(所有节点)

swapoff -a && sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab

setenforce 0 && sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config

2.6调整系统参数(所有节点)

modprobe br_netfilter

cat <<EOF> kubernetes.conf 
net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-ip6tables=1
EOF

cp kubernetes.conf /etc/sysctl.d/kubernetes.conf

sysctl -p /etc/sysctl.d/kubernetes.conf

2.7kube-proxy开启ipvs的前置条件(所有节点)

cat <<EOF> /etc/sysconfig/modules/ipvs.modules 
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4
EOF

chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep -e ip_vs -e nf_conntrack_ipv4

2.8安装docker(所有节点)

docker版本跟kubernetes版本需相对应,此次安装指定版本 20.10.21

#安装需要的软件包:
yum install -y yum-utils

#安装stable镜像仓库
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

#更新yum软件包索引(不是必须步骤 稍微快一些)
yum makecache fast          

#开始安装docker引擎(指定版本)
yum install -y docker-ce-20.10.21 docker-ce-cli-20.10.21 containerd.io

# 创建 /etc/docker 目录并修改配置文件
mkdir /etc/docker

cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
}
}
EOF

#启动docker
systemctl start docker && systemctl enable docker

三、安装部署kubernetes集群

3.1安装 kubeadm, kubelete, kubectl(所有节点)

#配置yum源
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

yum install -y kubelet kubeadm kubectl && systemctl enable kubelet

3.2修改kubelet启动参数(所有节点)

vim /usr/lib/systemd/system/kubelet.service.d/10-kubeadm.conf

#在 KUBELET_KUBECONFIG_ARGS 后面追加 --node-ip=<public_ip>

#如:--node-ip=10.10.10.10


#启动生效
systemctl daemon-reload

3.3重启kubelet(所有节点)

systemctl restart kubelet

3.4拉取所需镜像(所有节点)

#查看此版本所有各镜像版本
kubeadm config images list  --kubernetes-version=1.28.1  --image-repository registry.aliyuncs.com/google_containers

#拉取镜像
kubeadm config images pull  --kubernetes-version=1.28.1  --image-repository registry.aliyuncs.com/google_containers

但是pause的镜像,还是会自己去远程镜像仓库拉取,因为需要科学上网,所以就会报错连接不到,因为需要修改拉去地址

# 生成 containerd 的默认配置文件

containerd config default > /etc/containerd/config.toml

# 将仓库地址修改成 k8simage/pause:3.6

vim /etc/containerd/config.toml

sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.6"

# 重启 containerd 服务

systemctl daemon-reload
systemctl restart containerd.service

3.5初始化主节点(主节点)

kubeadm init --apiserver-advertise-address=10.10.10.10 --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.28.2 --service-cidr=10.96.0.0/12 --pod-network-cidr=10.244.0.0/16
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

3.6修改kube-apiserver 配置(主节点)

vim /etc/kubernetes/manifests/kube-apiserver.yaml

四、安装Fannel(子节点安装。master节点可不安装)

4.1下载fannel文件

cd /data/k8s
 
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

4.2修改 kube-flannel.yml,新增 2 个配置

 containers:
      - name: kube-flannel
        image: docker.io/flannel/flannel:v0.25.1
        command:
        - /opt/bin/flanneld
        args:       
        - --public-ip=$(PUBLIC_IP)
        - --iface=eth0
        - --ip-masq
        - --kube-subnet-mgr
        env:
        - name: PUBLIC_IP
          valueFrom:
            fieldRef:
              fieldPath: status.podIP
#安装
kubectl apply -f kube-flannel.yml

五、子节点加入工作节点(子节点)

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

kubeadm join 10.10.10.10:6443 --token tarxeq.ykm1cdpf27z2pp9b \
        --discovery-token-ca-cert-hash sha256:641f20cc75e7241653c8532fcde372361ca9771b63b529a7aecba414bef62822

节点都已ready,表明已安装完成啦

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