[opencms-dev] Technical inquiry: Multi-server site routing under shared domain in OpenCms

[Ramon Gavira Sáenz]

Hi Lorenz,
Thanks for your reply!
You're right ― mod_proxy_balancer and session stickiness are useful, but our main issue isn't load balancing or caching. It's more about URL rewriting and redirection across multiple OpenCms servers under a shared domain.
We're seeing problems with internal links, AJAX calls, and static exports not resolving correctly, likely due to how Apache handles path-based routing.
Any tips or examples on managing complex rewrite setups would be very helpful.
Best regards,
Ramon G.

________________________________
De: opencms-dev <opencms-dev-bounces at opencms.org> en nombre de Lorenz Lammersdorf via opencms-dev <opencms-dev at opencms.org>
Enviado: jueves, 11 de septiembre de 2025 19:01
Para: opencms-dev at opencms.org <opencms-dev at opencms.org>
Cc: Lorenz Lammersdorf <l.lammersdorf at ik.me>
Asunto: Re: [opencms-dev] Technical inquiry: Multi-server site routing under shared domain in OpenCms

Hi Ramon,

I assume you're using mod_proxy? It supports session stickyness.

Usually caching is done on the proxy. mod_proxy doesn't support caching,
have a look into mod_cache.

You should probably use a load balancer instead of a reverse proxy (and
I assume load balancing is the reason for this setup anyway).
mod_proxy_balancer is maybe your friend.

Regards
Lorenz


Am 11.09.2025 um 18:38 schrieb Ramon Gavira Sáenz via opencms-dev:
> Hello,
> I'm currently working on setting up an OpenCms architecture where
> multiple sites, hosted on separate OpenCms servers, are accessible under
> a shared corporate domain using path-based routing. The intended
> structure is as follows:
>
>   * |https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.corporate-domain.com%2Fopencms-server1%2Fsite1%257C&data=05%7C02%7Cramon.gavira%40sagasoluciones.com%7Cf27862f8686840fbb36908ddf154dd68%7Cf6b0987d77bc48e294799ca6dc648a37%7C0%7C0%7C638932069137174949%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=oI27Ru5roE1Wmmq8plkUOZPds8l0CfiuQGuSYi4bJqs%3D&reserved=0 → served
>     by /site1/ on *OpenCms Server 1*
>   * |https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.corporate-domain.com%2Fopencms-server1%2Fsite2%257C&data=05%7C02%7Cramon.gavira%40sagasoluciones.com%7Cf27862f8686840fbb36908ddf154dd68%7Cf6b0987d77bc48e294799ca6dc648a37%7C0%7C0%7C638932069137204386%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=AYHCxNIYKwIsLkdGscPop9Sfg1spjTPr%2B60d91tkKLc%3D&reserved=0 → served
>     by /site2/ on *OpenCms Server 1*
>   * |https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.corporate-domain.com%2Fopencms-server2%2Fsite1%257C&data=05%7C02%7Cramon.gavira%40sagasoluciones.com%7Cf27862f8686840fbb36908ddf154dd68%7Cf6b0987d77bc48e294799ca6dc648a37%7C0%7C0%7C638932069137222704%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=HJjRte4L0MoIgJrwK73NmGz0lWo7GpA1d9J9%2BkR8ARs%3D&reserved=0 → served
>     by /site1/ on *OpenCms Server 2*
>   * |https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.corporate-domain.com%2Fopencms-server2%2Fsite2%257C&data=05%7C02%7Cramon.gavira%40sagasoluciones.com%7Cf27862f8686840fbb36908ddf154dd68%7Cf6b0987d77bc48e294799ca6dc648a37%7C0%7C0%7C638932069137240316%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=wfns8szE5RGWYCkacxSLbf6xjeJwfzqnCk9DgUdZ5%2BI%3D&reserved=0 → served
>     by /site2/ on *OpenCms Server 2*
>
> To achieve this, I'm using *Apache HTTP Server* as a reverse proxy to
> route requests based on URL path to the appropriate backend OpenCms
> instance. However, I'm facing several issues that prevent the setup from
> working reliably:
>
>   * *Static export problems*: Some resources are not being served
>     correctly depending on the site and server.
>   * *AJAX calls*: Requests sometimes fail or are misrouted, especially
>     when dealing with dynamic content or session-dependent data.
>   * *Other inconsistencies*: Occasionally, internal links, resource
>     paths, or redirects behave unexpectedly, breaking the user experience.
>
> I'm wondering:
>
>   * Has anyone successfully implemented a similar architecture with OpenCms?
>   * Are there best practices or recommended configurations for Apache
>     (or alternatives like NGINX) to handle this kind of routing?
>   * Are there known limitations in OpenCms when operating behind a
>     reverse proxy with multiple instances?
>   * How do you handle session management, caching, and resource linking
>     across sites in this scenario?
>
> Any technical insights, configuration examples, or documentation
> references would be greatly appreciated.
> Thanks in advance!
> Ramon G.
>
>
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