五分钟，看是噱头。其实文件下载到位的话，一分钟，也不是不可能。
一，官网
二，文档
https://rancher.com/docs/k3s/latest/en/
三，下载
http://mirror.cnrancher.com/
进入到k3s的v1.20.0-k3s2/目录下载k3s和k3s-airgap-images-amd64.tar文件。
而k3s-install.sh在上一级目录。
k3s：k3s的可执行文件，kubectl别名
k3s-airgap-images-amd64.tar：离线安装镜像包
k3s-install.sh：安装脚本
四，安装过程
1，先安装依赖（如果需要）
yum install -y container-selinux selinux-policy-base
yum install -y https://rpm.rancher.io/k3s-selinux-0.1.1-rc1.el7.noarch.rpm
2，将k3s拷贝到可执行目录
以下步骤使用root帐号
cp k3s /usr/local/bin/
3，设置环境变量
export INSTALL_K3S_SKIP_DOWNLOAD=true
export INSTALL_K3S_EXEC="--docker --bind-address=1.2.3.4 \
kube-apiserver-arg service-node-port-range=30000-50000 \
--no-deploy traefik \
--no-deploy servicelb \
--no-deploy local-storage \
--no-deploy metrics-server \
--write-kubeconfig ~/.kube/config \
--write-kubeconfig-mode 666"
- 本地已有镜像，无须下载
- 使用docker服务，无须部署servicelb, traefik, local-storage, metrics-server
- 可选禁用项：coredns, servicelb, traefik,local-storage, metrics-server
4，运行安装脚本
sh k3s-install.sh
输出
[INFO] Skipping k3s download and verify
[INFO] Skipping installation of SELinux RPM
[INFO] Creating /usr/local/bin/kubectl symlink to k3s
[INFO] Skipping /usr/local/bin/crictl symlink to k3s, command exists in PATH at /usr/bin/crictl
[INFO] Skipping /usr/local/bin/ctr symlink to k3s, command exists in PATH at /usr/bin/ctr
[INFO] Creating killall script /usr/local/bin/k3s-killall.sh
[INFO] Creating uninstall script /usr/local/bin/k3s-uninstall.sh
[INFO] env: Creating environment file /etc/systemd/system/k3s.service.env
[INFO] systemd: Creating service file /etc/systemd/system/k3s.service
[INFO] systemd: Enabling k3s unit
[INFO] systemd: Starting k3s
5，获取kubeconfig文件
cat ~/.kube/config
以下步骤使用普通帐号，将root下的kubeconfig文件内容，cp到普通帐号的对应目录即可。
6，测试yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
spec:
selector:
matchLabels:
app: nginx
replicas: 1
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.18-alpine
imagePullPolicy: IfNotPresent
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: nginx-service
spec:
selector:
app: nginx
ports:
- protocol: TCP
name: http
port: 80
targetPort: 80
type: NodePort
