Linux 安装k8s 我自己的宝藏

一、kubernetes 安装

1、安装前置环境（都执行）

1、基础环境

所有机器执行以下操作：

#关闭防火墙：如果是云服务器，需要设置安全组策略放行端口
systemctl stop firewalld
systemctl disable firewalld

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

#查看修改结果
hostname

#设置hostname解析
echo  "127.0.0.1  $(hostname)"  >> /etc/hosts

# 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

#设置
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

#生效
sudo sysctl --system

2、docker 环境

#移除以前docker相关包
sudo yum remove docker*

#配置yum源
sudo yum install -y yum-utils
sudo yum-config-manager \
--add-repo \
http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

#安装docker
yum install -y docker-ce-19.03.1 docker-ce-cli-19.03.1  containerd.io-1.4.6

#启动docker
systemctl enable docker --now


#配置加速
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://82m9ar63.mirror.aliyuncs.com"],
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

3、安装k8s核心（每台服务器都执行）

#配置k8s的yum源
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

# 卸载旧版本
yum remove -y kubelet kubeadm  kubectl 

#安装 kubelet kubeadm  kubectl 指定版本 
sudo yum install -y kubelet-1.20.9 kubeadm-1.20.9 kubectl-1.20.9 --disableexcludes=kubernetes

#开机自启kubelet
sudo systemctl enable --now kubelet

4、初始化master节点 （master执行）

#下载各个机器需要的镜像
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

#创建k8s集群
kubeadm init \
--apiserver-advertise-address=10.23.0.16 \
--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

#master 初始化的日志
Your Kubernetes control-plane has initialized successfully!

##init 完成后第一步：复制相关文件夹
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
## 导出环境变量
Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

##部署一个pod网络
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/

########################## 如下：安装calico ###########################
kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

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

kubeadm join 10.23.0.16:6443 --token 2zfxoz.9isw7jkd7f7vswux \
    --discovery-token-ca-cert-hash sha256:6a44811d8cbb4f06275891a566818d42e96db43dbedfa863f966a83ec0b3b968