【kubernetes】【自用】1.20-1.23版本 k8s集群搭建

2024 年 9 月 7 日 7点热度 0人点赞 0条评论

引言

笔者本人已经参照该部署步骤超过10次k8s集群，在1.20-1.23大版本情况下均适用。对其他大版本未试验，以后试验再更新版本情况
️ 安装k8s之前记得对初始化虚机打个快照，出现问题可直接恢复快照解决，这是比较快的方法
️ 未具体说明执行的节点则表明在多个节点均执行命令

时间同步

sudo timedatectl set-timezone Asia/Shanghai

主机名称修改，hosts添加域名映射

主机名称修改

名称随意

# master节点执行
hostnamectl set-hostname master-node
# worker1节点执行
hostnamectl set-hostname worker-node1
# worker2节点执行
hostnamectl set-hostname worker-node2

节点配置hosts

cat >> /etc/hosts <<EOF 10.31.203.11 master-node 10.31.203.12 worker-node1 10.31.203.13 worker-node2 EOF

安装插件

yum install -y wget
yum install -y net-tools epel-release
yum install -y vim  yum-utils device-mapper-persistent-data lvm2

yum配置docker源

yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

yum配置k8s源

cat <<EOF > /etc/yum.repos.d/kubernetes.repo [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 EOF

关闭防火墙

sudo systemctl stop firewalld.service  
sudo systemctl disable firewalld.service
sudo firewall-cmd --state

关闭Selinux防火墙

sudo setenforce 0
sudo vi /etc/selinux/config

修改：
SELINUX=disabled

创建文件夹

mkdir /etc/docker

配置docker，cgroup驱动为systemd，添加不安全registry

vim /etc/docker/daemon.json

# 添加如下内容
{
    
    "exec-opts": ["native.cgroupdriver=systemd"],
    "insecure-registries": ["0.0.0.0/0"] 
}

️ insecure-registries可不配置，主要是我遇到了好多和内网ip的registry有关问题，提前将这个参数配置好的话，以后省事一点～

安装docker-ce和k8s（可以指定dcoker版本号）

yum install -y docker-ce kubectl-1.23.5 kubelet-1.23.5 kubeadm-1.23.5 kubernetes-cni
systemctl enable docker
systemctl start docker
systemctl enable kubelet

禁用swap，关闭交换内存

sudo swapoff -a
vim /etc/sysconfig/kubelet

修改：
KUBELET_EXTRA_ARGS="--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.2"

设置swap开机不启动

vim /etc/fstab

修改：# /dev/mapper/centos-swap swap swap defaults 0 0

桥接网络设置

modprobe br_netfilter
cat <<EOF > /etc/sysctl.d/k8s.conf net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF
sysctl -p /etc/sysctl.d/k8s.conf

主节点执行：集群初始化

kubeadm init --kubernetes-version=v1.23.5 \
--pod-network-cidr=10.244.0.0/16 \
--apiserver-advertise-address=10.31.203.11 \
--image-repository=registry.cn-hangzhou.aliyuncs.com/google_containers \
--ignore-preflight-errors=Swap

️ 版本要与前面安装版本一致
️ apiserver-advertise-address为master node ip
️ 如果初始化配置错误，可以重置kubeadm：kubeadm reset
执行成功后会返回如下信息：

# 执行成功后，会返回
# 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

# 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/

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

kubeadm join 10.31.203.11:6443 --token gg9s4y.y33ehoxbxg4entr2 \
    --discovery-token-ca-cert-hash sha256:89d7cdfb678c5cf8951903b58eb6cbc147e283c4ec548f4b01246a97b787f485
# 所有的子节点可以通过上方命令加入集群

主节点执行：创建kubeconfig配置

#复制配置
mkdir ~/.kube
cp -i /etc/kubernetes/admin.conf ~/.kube/config
chown $(id -u):$(id -g) ~/.kube/config

主节点执行：配置flannel 网络

# 直接复制粘贴就好了
# https://github.com/coreos/flannel
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
kubectl  apply -f kube-flannel.yml

主节点获取子节点Join命令

# 可以直接参照master节点init后的成功返回信息，最下两行则为子节点加入集群的命令
kubeadm token create --print-join-command

子节点执行Join命令

kubeadm join 10.31.203.11:6443 --token gg9s4y.y33ehoxbxg4entr2 \
    --discovery-token-ca-cert-hash sha256:89d7cdfb678c5cf8951903b58eb6cbc147e283c4ec548f4b01246a97b787f485

至此，等待服务全部正常该集群则成功部署～

kubectl get po -A

以下为一些额外的辅助内容

kubectl自动补全

yum install -y bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc

查看节点日志

journalctl -f -u kubelet

完整重置k8s

kubeadm reset --v=5

rm -rf /var/lib/cni/
rm -rf /var/lib/kubelet/*
rm -rf /etc/cni/
ifconfig cni0 down
ifconfig flannel.1 down
ifconfig docker0 down
ip link delete cni0
ip link delete flannel.1