Setting Up a Frontend Load Balancer for the Kubernetes API

You can install Nginx like this:

sudo apt-get install -y nginx
sudo systemctl enable nginx

Do the following to configure the Nginx load balancer:

sudo mkdir -p /etc/nginx/tcpconf.d
sudo vi /etc/nginx/nginx.conf

Add the following configuration at the bottom of nginx.conf:

include /etc/nginx/tcpconf.d/*;

Create a config file to configure Kubernetes API load balancing:

cat << EOF | sudo tee /etc/nginx/tcpconf.d/kubernetes.conf
stream {
    upstream kubernetes {
        server <controller 0 private ip>:6443;
        server <controller 1 private ip>:6443;
    }

    server {
        listen 6443;
        listen 443;
        proxy_pass kubernetes;
    }
}
EOF

Reload the Nginx configuration:

sudo nginx -s reload

You can verify that everything is working by making a request to the Kubernetes API through the load balancer:

curl -k https://localhost:6443/version

This request should return some Kubernetes version data.