how to use Redundancy with Reference Server

[shizukanaqun]

Need a code and configuration example for using Reference Server to complete Redundancy development

[mregen]

hi @shizukanaqun, which redundancy feature do you mean?

The reference server supports the Transfersubscription service.

Other faetures like durable subscriptions or server redundancy are not supported.

[shizukanaqun]

Thank you for your reply. I would like to know how to implement Transparent Redundancy using reference server as an example, as described in https://reference.opcfoundation.org/Core/Part4/v104/docs/6.6.2. I need to What should you pay attention to in the code and what configuration needs to be done?

[mregen]

Hi @shizukanaqun, the server redundancy feature is not implemented in this library.
Depending on the redundancy type, there needs to be an extension in the address space and also mechanism for leader election between the servers.

[shizukanaqun]

ok，thx！Are there any examples? Or are there any plans to make an example of transparent redundancy?I think many people will need this example

[PaulHunkar]

True transparent redundancy on a server usually requires a hardware component, the network needs to switch over seamlessly, also all connection states need to be twinned between the servers. In short, to a client to a pair (or set) of transparent UA servers appear as if they are a single server. To a client, they should not notice a failure of a server in most cases. At worst a single message might need to be replayed, but no information is lost, no session or subscriptions need to be recreated. Other type of redundancy described in https://reference.opcfoundation.org/Core/Part4/v105/docs/6.6.2

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