ip tuntap add mode tun dev tun0
ip addr add 198.18.0.1/15 dev tun0
ip link set dev tun0 up
# download tun2socks
# https://github.com/xjasonlyu/tun2socks

DNS_IP=8.8.8.8
GATEWAY_IP=$(ip route | grep default | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b")
DEFAULT_ROUTE=$(ip route | grep default | sed -E 's/( metric.*)?$/ metric 100/g;')
DEFAULT_NET_DEVICE=$(ip route | grep default | grep -oP '(?<=dev )\w+')
# run with root privilege
ip route delete default
ip route add $DEFAULT_ROUTE
ip route add default dev via 198.18.0.1 tun0
ip route add $DNS_IP via $GATEWAY_IP dev $DEFAULT_NET_DEVICE

./tun2socks -interface $DEFAULT_NET_DEVICE -device tun://tun0 -proxy <proxy_protocol>://<proxy_address>

ip route delete default dev tun0

export KUBECONFIG=<kubeconfig_filepath>

# prefer ustc and azure mirrors of quay.io
export VERSION=$(curl -s https://api.github.com/repos/kubevirt/kubevirt/releases | grep tag_name | grep -v -- '-rc' | head -1 | awk -F': ' '{print $2}' | sed 's/,//' | xargs)
echo $VERSION
curl -OLk https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/kubevirt-operator.yaml
curl -OLk https://github.com/kubevirt/kubevirt/releases/download/${VERSION}/kubevirt-cr.yaml
export VERSION=$(curl -s https://api.github.com/repos/kubevirt/containerized-data-importer/releases | grep tag_name | grep -v -- '-rc' | head -1 | awk -F': ' '{print $2}' | sed 's/,//' | xargs)
curl -LkO https://ghproxy.net/github.com/kubevirt/containerized-data-importer/releases/download/$VERSION/cdi-operator.yaml
curl -LkO https://ghproxy.net/github.com/kubevirt/containerized-data-importer/releases/download/$VERSION/cdi-cr.yaml

kubectl get pods -n kubevirt
kubectl get vmi

# get the download address from: https://github.com/kubevirt/kubevirt/releases/
curl -LkO <download_address>
sudo mv <downloaded_binary> /usr/bin/virtctl
sudo chmod +x /usr/bin/virtctl

kubectl apply -f init_vm.yaml
kubectl get vm
kubectl get vmi

virtctl console <vm_name>
# ssh config is stored at: ~/.ssh/kube_known_hosts
virtctl ssh <user>@<vm_name>
# run this under gui, with `vncviewer` in path
# install with `apt install tigervnc-viewer`
virtctl vnc <vm_name>

docker login
docker build -t <username>/<imagename>:<tag> -f <dockerfile> <resource_path>
docker push <username>/<imagename>:<tag>

# for microk8s the registry address is localhost:32000
docker tag <imagename> <registry_addr>/<imagename>
docker push <registry_addr>/<imagename>

minikube image build -t <imagename> -f <dockerfile_path> <resource_path>

# ref: https://minikube.sigs.k8s.io/docs/commands/image/
# remember to set a tag to the image imported
# or set the imagePullPolicy to Never
# ref: https://iximiuz.com/en/posts/kubernetes-kind-load-docker-image/
minikube image load <image_filepath>/<docker_image_name>
microk8s images import <image_filepath>
microk8s ctr image import <image_filepath>
k3s ctr image import <image_filepath>

fallocate -l 10G /bigfile

while true;
do
microk8s kubectl delete pods --field-selector=status.phase=Failed
microk8s kubectl delete pods --field-selector=status.phase=Unknown
sleep 60
done

sudo snap install --classic microk8s
sudo microk8s enable dns:<dns_ip>

curl -sfL https://get.k3s.io > k3s_setup.sh
# replace the line if GITHUB_URL to some github mirror instead
bash k3s_setup.sh

curl -sfL https://rancher-mirror.rancher.cn/k3s/k3s-install.sh | INSTALL_K3S_MIRROR=cn sh -​

curl -sSLf https://get.k0s.sh | sudo sh
sudo k0s install controller --single
sudo k0s start

sudo apt install npm
sudo npm config set registry https://registry.npmmirror.com
sudo npm install -g pm2
pm2 startup

pm2 start -n <process_name> <executable_name> -- <process_arguments>
# save all processes
pm2 save
pm2 monit
pm2 logs
pm2 ls

docker run -d <image_name> tail -f /dev/null
docker run -d <image_name> sleep infinity
docker run -dt <image_name>
docker run -dt <image_name> cat
docker run -d <image_name> nc -l -p <port>