Add ansible_host with fallback on etcd,pg_hba, haproxy conf

[tanganellilore]

Hi @vitabaks,

This PR introduce the usage of ansible_host that can be used in inventory to specify IP of machine, instead usage of inventory_hostname.

I notice in the invnetory example that this was specified, but hostnamme (if we use it on inventory) not working whell in etcd, pg_hba and haproxy.

let me know if i need to change something. Thanks

[vitabaks]

Hi @tanganellilore

ansible_host is used to specify a public IP address to connect to servers during deployment.

Therefore, using this variable for listening by cluster components is a bad idea.

[vitabaks]

isn't this comment enough for the user to specify the ip address and not the names?

Please specify the ip addresses and connection settings for your environment The specified ip addresses will be used to listen by the cluster components. Attention! Specify private IP addresses so that the cluster does not listen a public IP addresses. For deploying via public IPs, add 'ansible_host=public_ip_address' variable for each node.

[tanganellilore]

Hi @vitabaks, Yes ansible_host is used to connect into machine, but this not mean that is a "public" ip. I can have a private network, with private AD and with him hostname.

In perspective to use this very usefull playbook, in AWX or APP, usage of ip as inventory hostname for me is a limitation.

In any case, can you evaluate to use a different variable for ip, instead inventory_hostname, that is not ansible_hosts? I can implement it for you.

One idea can be the usage of default_ipv4 facts (but i don't know if in Aws like is the private ip) or pass the ifname to retrieve current ip.

Let me know and thanks for support

[vitabaks]

using inventory_hostname was a simple and fast way to implement listening settings by cluster components on the specified network.

It may be worth abandoning this method in favor of the bind_address variable (similar to consul_bind_address) for the interface designated in the interface variable (similar to vip_interface of consul_iface)

[tanganellilore]

Ok, il will check it and propose in this PR this approach. I will think to maintain the fallback to inventory_hostname as per default.

It's ok for you?

[vitabaks]

I don't mind as long as it's good for everyone