Hi,
can someone please help me on this?
I am trying to set up an active-active cluster with swarm and haproxy. I am
struggling with the peers definition as it takes hostname and IP address
into account. With swarm this can be a bit tricky.
I want to use mode host for the ports on the proxy so that I can rout
traffic with DNS and tcp roundrobin to the proxy nodes.
```yml
proxy:
image: "saps-proxy:5"
hostname: '{{.Node.Hostname}}'
dns: 127.0.0.11
ports:
- target: 80
published: 80
protocol: tcp
mode: host
- target: 443
published: 443
protocol: tcp
mode: host
- target: 1024
mode: host
protocol: tcp
deploy:
mode: global
placement: { constraints: ["node.labels.type == proxy"] }
resources: { limits: { memory: 2G } }
```
In the haproxy.cfg I am defining a peers section.
```conf
peers layer7-loadbalancer
bind *:1024
server hostname1.bloom.com
server hostname2.bloom.com 10.128.0.2:1024 # (ip of real host)
```
This seems to work for the local peer. But I think it's actually using the
container IP. I can also not really spawn replicas from this.
So I try another syntax. When written like this HAProxy will bind IP:port
from the peer name that is matching the hostname.
```
peers layer7-loadbalancer
peer hostname1.bloom.com 10.128.0.1:1024 # (ip of real host)
peer hostname2.bloom.com 10.128.0.2:1024 # (ip of real host)
```
I get an error though.
```
Starting proxy hostname1.bloom.com:
cannot bind socket (Cannot assign requested address) [10.128.0.1:1024]
```
This makes sense because the container IP is actually not the host IP. That
is why this address cannot be bound from inside the container.
At this point, I am not really sure how to solve this.
Regards,
Nico
