针对containerd 的镜像源的不稳定问题，使用docker下载镜像后，转换为tar包，重新部署到ctr的镜像库来让k8s使用
1. 准备docker
# 准备好docker
sudo apt update && sudo apt install -y docker.io
sudo systemctl enable --now docker
sudo usermod -aG docker $USER
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{ "registry-mirrors":
[ "https://docker.m.daocloud.io",
"https://docker.imgdb.de",
"https://docker-0.unsee.tech",
"https://docker.hlmirror.com",
"https://docker.1ms.run",
"https://func.ink",
"https://hub-mirror.c.163.com",
"https://mirror.baidubce.com"
]
}
EOF
2. 重启 Docker
sudo systemctl daemon-reload
sudo systemctl restart docker
newgrp docker
3. 构建
mkdir /home/hw/my_image && cd /home/hw/my_image
4. 写入最小 Dockerfile
cat > Dockerfile <<'EOF'
FROM alpine
CMD ["echo", "Hello from my first image!"]
EOF
docker build -t my-first-image:latest .
5. 保存 & 导入 k8s
docker save my-first-image:latest -o my-first-image.tar
sudo ctr -n k8s.io images import my-first-image.tar
sudo crictl images
6. 运行
# 自己构建的镜像可以这么操作
kubectl run my-first-pod --image=my-first-image --restart=Never
# 禁止使用远程仓库，从本地拉取镜像
kubectl run nginx-pod --image=docker.io/library/nginx:latest --restart=Never --image-pull-policy=Never
7. 验证
kubectl get pods
