kubernetes环境部署

kubernetes环境部署

一、环境

centos7.9 64bit 2核4G 三台 50G

二、安装docker（具体看docker安装篇章）

1.配置yum源
2.安装docker

yum install -y docker-ce-20.10.7 docker-ce-cli-20.10.7  containerd.io-1.4.6

3.启动docker
4.配置镜像加速

三、使用kubeadm搭建集群

注意：
1.节点中不可有重复的主机名、MAC地址或product_uuid
2.禁用交换分区，保证kubelet的正常工作

#各个机器设置自己的域名 master node1 node2
hostnamectl set-hostname xxxx


# 将 SELinux 设置为 permissive 模式（相当于将其禁用）
sudo setenforce 0
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

#关闭swap
swapoff -a  
sed -ri 's/.*swap.*/#&/' /etc/fstab

#允许 iptables 检查桥接流量
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

四、安装kubelet、kubeadm、kubectl

#三台都需进行以下步骤
cat <<EOF | sudo tee /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
exclude=kubelet kubeadm kubectl
EOF


sudo yum install -y kubelet-1.20.9 kubeadm-1.20.9 kubectl-1.20.9 --disableexcludes=kubernetes
#开机自启
sudo systemctl enable --now kubelet

kubelet 现在每隔几秒就会重启，因为它陷入了一个等待 kubeadm 指令的死循环

五、下载各个机器需要的镜像

#三台都需进行以下操作
sudo tee ./images.sh <<-'EOF'
#!/bin/bash
images=(
kube-apiserver:v1.20.9
kube-proxy:v1.20.9
kube-controller-manager:v1.20.9
kube-scheduler:v1.20.9
coredns:1.7.0
etcd:3.4.13-0
pause:3.2
)
for imageName in ${images[@]} ; do
docker pull registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/$imageName
done
EOF
   
chmod +x ./images.sh && ./images.sh

结果

六、初始化主节点

#所有机器添加master域名映射，以下需要修改为自己的masterip
#此处的ip必须为云服务器的网卡ip，而不是公网ip
echo "172.31.0.4  cluster-endpoint" >> /etc/hosts

#主节点初始化
#使用主节点ip以及对应的域名cluster-endpoint
kubeadm init \
--apiserver-advertise-address=172.31.0.4 \
--control-plane-endpoint=cluster-endpoint \
--image-repository registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images \
--kubernetes-version v1.20.9 \
--service-cidr=10.96.0.0/16 \
--pod-network-cidr=192.168.0.0/16

#所有网络范围不重叠

执行结果：

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 control-plane nodes by copying certificate authorities
and service account keys on each node and then running the following as root:

  kubeadm join cluster-endpoint:6443 --token hums8f.vyx71prsg74ofce7 \
    --discovery-token-ca-cert-hash sha256:a394d059dd51d68bb007a532a037d0a477131480ae95f75840c461e85e2c6ae3 \
    --control-plane 

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

kubeadm join cluster-endpoint:6443 --token hums8f.vyx71prsg74ofce7 \
    --discovery-token-ca-cert-hash sha256:a394d059dd51d68bb007a532a037d0a477131480ae95f75840c461e85e2c6ae3

此时master还需要根据提示进行操作如下：

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

node1和node2节点根据提示加入集群操作如下：输入提示内容中的令牌

kubeadm join cluster-endpoint:6443 --token hums8f.vyx71prsg74ofce7 \
    --discovery-token-ca-cert-hash sha256:a394d059dd51d68bb007a532a037d0a477131480ae95f75840c461e85e2c6ae3

如令牌忘记可在master下运行以下命令找到：

kubeadm token create --print-join-command

七、安装网络组件calico

calico官网

#在master上安装即可
curl https://docs.projectcalico.org/v3.14/manifests/calico.yaml -O

kubectl apply -f calico.yaml

八、部署dashboard

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