k8s 环境搭建

1. k8s 安装

systemctl stop firewalld
systemctl disable firewalld

# 修改 hostname
hostnamectl set-hostname k8s-01
# 查看修改结果
hostnamectl status
# 设置 hostname 解析
echo "127.0.0.1 $(hostname)" >> /etc/hosts

#关闭 selinux：
sed -i 's/enforcing/disabled/' /etc/selinux/config
setenforce 0

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

# 允许 iptables 检查桥接流量 （K8s 官方要求）
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

# 让配置生效
sysctl --system

2. 安装 docker

3. 安装k8s

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

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

# 查看可以安装的版本
yum list kubelet --showduplicates | sort -r

# 安装kubelet、kubeadm、kubectl 指定版本
yum install -y kubelet-1.21.0 kubeadm-1.21.0 kubectl-1.21.0

# 开机启动kubelet
systemctl enable kubelet && systemctl start kubelet

#!/bin/bash
images=(
kube-apiserver:v1.21.14
kube-proxy:v1.21.14
kube-controller-manager:v1.21.14
kube-scheduler:v1.21.14
coredns:v1.8.0
etcd:3.4.13-0
pause:3.4.1
)
for imageName in ${images[@]} ; do
docker pull registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/$imageName
done

chmod +x images.sh && ./images.sh

##注意1.21.0版本的k8s coredns镜像比较特殊，结合阿里云需要特殊处理，重新打标签
docker tag registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/coredns:v1.8.0 registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/coredns/coredns:v1.8.0

########kubeadm init 一个master########################
########kubeadm join 其他worker########################
kubeadm init \
--apiserver-advertise-address=10.211.55.10 \
--image-repository registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images \
--kubernetes-version v1.21.0 \
--service-cidr=10.96.0.0/16 \
--pod-network-cidr=192.168.0.0/16
## 注意：pod-cidr与service-cidr

######按照提示继续######
## 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