Ipv4 Only Clients

Working with IPv4 only clients#

Some clients might only support IPv4. To ensure that these clients can communicate with the cluster you might want to look into renting a VPS with a static IPv4 address and configure it as a TCP proxy for your Kubernetes services. You can do this by setting an A wildcard record pointing to your VPS IP in your DNS provider and then on your VPS, you can install and configure haproxy as follows:

1. Ensure you have an A wildcard record pointing to your VPS IP in your DNS provider.
2. Install haproxy on your VPS:
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   sudo apt-get update && \
   sudo apt install haproxy -y

3. Add this to your /etc/haproxy/haproxy.cfg file:
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   global
       log /dev/log local0
       maxconn 2000
       daemon
   
   defaults
       log     global
       mode    tcp
       timeout connect 5s
       timeout client  1m
       timeout server  1m
   
   resolvers dns
       nameserver dns1 2001:4860:4860::8888:53
       resolve_retries 3
       timeout retry 1s
       hold valid 30s
   
   frontend https_in
       bind 0.0.0.0:443
       default_backend home_ipv6_tls
       option tcplog
   
   backend home_ipv6_tls
       server home1 auth.<domain>:443 resolvers dns resolve-prefer ipv6
   
   frontend ssh_in
       bind 0.0.0.0:22
       default_backend home_ipv6_ssh
       option tcplog
   
   backend home_ipv6_ssh
       server home1 gitea.<domain>:22 resolvers dns resolve-prefer ipv6

   Note that you need to replace <domain> with your actual domain.
4. Save the file and restart HAProxy.
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   sudo systemctl enable --now haproxy && \
   sudo systemctl restart haproxy