We are following this original tutorial by Simos so we are just tweaking this for Google Cloud Platform to make sure HAProxy will work properly.
We assume that LXD has been already setup from that guide and we are now on step 3 where containers are already created.
The difference on this tutorial if you are using Google Cloud containers is that there’s no need to specify the IP address. GCP is using NAT on all Virtual Machines so the GCP container/main host does not actually own the IP address and we are just removing this.
-d your_server_ip/32From the original tutorial command for IP tables:
sudo iptables -t nat -I PREROUTING -i eth0 -p TCP -d your_server_ip/32 --dport 80 -j DNAT --to-destination your_haproxy_ip:80
Command that we should be using for GCP (Google Cloud Platform) <– We we will this later after we flushed the IP tables.
sudo iptables -t nat -I PREROUTING -i ens4 -p TCP --dport 80 -j DNAT --to-destination 10.22.74.193:8010.22.74.193 is the HAProxy IP from the LXC list (screenshot above).
Clearing the IP Tables using this bash script:
#!/bin/sh
echo "Flushing iptables rules..."
sleep 1
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
ens4 is the Network Infterace Card name of the GCP machine. You can get that using “ifconfig” command
Execute the IP Tables command
(10.22.74.193 is the IP of our HAProxy container)
sudo iptables -t nat -I PREROUTING -i ens4 -p TCP --dport 80 -j DNAT --to-destination 10.22.74.193:80Your IP Address from GCP
Save the IP tables.
sudo /sbin/iptables-save
My DNS settings for that subdomain
Testing HAProxy
34.96.177.142 is the IP of your GCP machine
curl --verbose --header 'Host: lxd1.johnmark.me' https://34.96.177.142
Adding another site
edit the haproxy.cfg file then add the other domain
Test the haproxy config file and reload it.
Adding the domain to my DNS list
And see the beauty of HAProxy
I hope you enjoyed this article! 🙂