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Nextcloud and Collabora are cooperating services, not one combined server. Once the Collabora endpoint is reachable, install the Nextcloud Office app and enter that endpoint under Administration settings → Office.
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What Nextcloud Office and Collabora actually are
Nextcloud provides the files, accounts, sharing rules, and web interface. Collabora Online provides the browser-based editing engine. In a dedicated installation, Nextcloud sends document-editing requests to a Collabora service running alongside the Nextcloud web stack; users continue opening files from Nextcloud.
Be careful with version-specific terminology. The current Nextcloud 35 manual identifies Euro-Office as the default Nextcloud Office solution and says that it requires a Euro-Office Document Server. Collabora Online is presented as a fully supported alternative based on CODE (Collabora Online Development Edition), available either as a self-hosted service or through a built-in app. Both backends support common DOC/DOCX, PPT/PPTX, XLS/XLSX, and OpenDocument formats.
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The Nextcloud Office app is the connector in Nextcloud. It is not the Collabora document server itself. You must either provide a Collabora endpoint or install the built-in CODE option before the connector can open documents.
Choose the deployment that fits your workload
Nextcloud documents four broad routes. The easiest route is not automatically the fastest, and a dedicated server adds networking work that the built-in option avoids.
| Deployment | Best fit | Trade-off |
|---|---|---|
| Built-in CODE app | Personal use or a small team that wants the fewest setup steps | Nextcloud describes it as slower than a standalone installation and says it lacks advanced scalability features |
| Dedicated Docker service | Administrators comfortable operating containers, DNS, TLS, and a reverse proxy | Requires a separate office hostname, certificates, service networking, and proxy rules |
| Distribution packages | Administrators who prefer the operating system’s package manager | You operate and update Collabora directly on the host |
| Nextcloud All In One | Readers choosing Nextcloud’s integrated deployment approach | Confirm the current AIO configuration and included components for the exact version you run |
There is no universal resource size, price, or concurrency number established by the documentation for every workload. If the built-in server becomes sluggish or you need more scalability controls, move the document service to a dedicated installation rather than assuming a larger Nextcloud web container will solve it.
Prerequisites for a dedicated Collabora service
The documented Docker example targets a recent Ubuntu or Debian host running Apache. Before starting, make sure all of these conditions are true:
- A machine that can run Docker and keep the Collabora container available.
- A public DNS name for Nextcloud, already working over HTTPS.
- A separate DNS name for Collabora, commonly
office.example.com, resolving to the server or reverse proxy that will receive office traffic. - Valid TLS certificates for both the Nextcloud hostname and the Collabora hostname.
- An Apache reverse proxy with the modules required by the Collabora example. nginx, Caddy, Traefik, and other proxies need their own equivalent Collabora configuration.
- The Nextcloud hostname that Collabora is allowed to trust in its alias configuration.
A home server or mini PC can provide the Docker host, but the documentation does not specify a required model or performance threshold. Treat hardware choice as an infrastructure decision based on your users and other services, not as a mandatory product purchase.
Deploy Collabora with Docker
1. Verify Nextcloud before adding the office service
Open the public Nextcloud URL from a browser and confirm that login, file access, and HTTPS work. Fix certificate, DNS, or proxy problems on the Nextcloud side first. Collabora must be able to identify the same public Nextcloud hostname that users and the proxy expose.
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Create a DNS record such as office.example.com pointing to the server or edge proxy that will accept Collabora traffic. Test that the name resolves from the networks where users will edit documents. If DNS points at a different proxy than Nextcloud, ensure that proxy can forward the office routes to the Docker host.
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3. Obtain certificates for both names
Install a certificate valid for the Nextcloud hostname and another valid for the office hostname, or use a certificate that legitimately covers both. Browsers and Nextcloud must be able to validate the complete certificate chain. An HTTP-only office endpoint is not the documented production arrangement.
4. Start the Collabora CODE container
The official example uses the collabora/code image, publishes container port 9980 only on the host loopback interface, and allows the Nextcloud host through an aliasgroup1 setting. Binding to loopback keeps the container behind the reverse proxy rather than exposing its unencrypted service port directly to the Internet.
docker pull collabora/code
docker run -d
--name collabora-code
--restart unless-stopped
-p 127.0.0.1:9980:9980
-e 'aliasgroup1=https://cloud.example.com:443'
collabora/codeUse your real Nextcloud hostname in the alias value. This is an illustrative form of the documented pattern; check the current Collabora release documentation for image options, allowed-host syntax, and update guidance before deploying it unchanged. Do not expose port 9980 publicly when the reverse proxy is intended to terminate HTTPS.
5. Put Apache in front of the container
The documented example terminates HTTPS at Apache and forwards the Collabora service on localhost. Its proxy configuration must cover all of the paths Collabora and the browser use:
/browserfor browser-side assets./hosting/discoveryfor WOPI discovery./hosting/capabilitiesfor capability information.- WebSocket traffic under
/cool. - The main
/coolendpoint. - A compatibility mapping for
/loolused by older integrations or routes.
Enable the Apache proxy and WebSocket modules required by the current example, create an HTTPS virtual host for office.example.com, and proxy those paths to http://127.0.0.1:9980. Keep the proxy rules together with the certificate configuration for the office virtual host. The exact directives vary with Apache version and your existing virtual-host layout; copying an Apache recipe into nginx or another proxy will not work without translating the routes and WebSocket handling.
After reloading Apache, visit the office hostname over HTTPS and inspect the proxy logs. A reachable landing response alone does not prove that document editing works; discovery and WebSocket requests must also pass.
6. Connect Nextcloud to Collabora
- Sign in to Nextcloud as an administrator.
- Open Apps and install or enable Nextcloud Office.
- Go to Administration settings → Office.
- Choose the option to use a Collabora Online server and enter the public HTTPS URL, for example
https://office.example.com. - Save the setting, then open a supported DOCX, XLSX, PPTX, or ODF file from a test account.
Use the public office URL in the setting, not the container’s loopback address. Nextcloud and users must reach the same HTTPS endpoint that the reverse proxy publishes.
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How the request flows
A useful way to diagnose this stack is to follow one edit session. The browser loads the file interface from Nextcloud. Nextcloud’s Office connector consults Collabora’s discovery and capability endpoints, then establishes the editing session through the Collabora routes. The reverse proxy terminates TLS and forwards ordinary HTTP requests and WebSocket traffic to the container on port 9980. Collabora checks that the requesting Nextcloud host is in its allowed alias configuration.
This explains why several apparently unrelated settings matter together: a correct DNS record with a broken WebSocket route still fails; a working WebSocket route with a certificate-name mismatch still fails; and a healthy Collabora container that does not allow your Nextcloud hostname may load a page but refuse to edit.
Built-in CODE: the simpler alternative
For personal use or a small team, Nextcloud’s built-in CODE app can avoid a separate Docker service and much of the proxy wiring. Install the relevant app from Nextcloud’s app administration, follow the version-specific setup prompts, and test editing with a non-administrator account.
The convenience has a documented cost: Nextcloud says the built-in server is slower than a standalone installation and does not include advanced scalability features. If simultaneous editing or larger files causes unacceptable delays, use a dedicated Collabora service. Do not describe the built-in app and a dedicated container as the same deployment; they have different networking, update, and performance characteristics.
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Container updates
The example uses the floating collabora/code image tag. The documented update pattern is to pull the image again and replace the running container. Before doing so, read the current Collabora release notes and Nextcloud compatibility guidance, record your existing environment and proxy settings, and schedule a maintenance window.
docker pull collabora/code
docker stop collabora-code
docker rm collabora-code
# Recreate the container with the same allowed-host and port settingsThe documentation does not establish a universal stable-tag or pinning policy. In a production environment, choose an update policy deliberately: track a tested version, retain a rollback image, and test opening and editing each supported file type after an upgrade.
Certificates, DNS, and proxy changes
Renew certificates before they expire and verify that the office hostname still resolves to the intended proxy. After changing Apache rules, test discovery, capabilities, a new editing session, and a live edit that crosses the WebSocket connection. Keep the Collabora container private behind the proxy unless your architecture explicitly requires another exposure model.
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Backups and recovery boundaries
Nextcloud remains the system of record for stored files and its database. Collabora is the editing service, so rebuilding its container should not replace your Nextcloud file and database backup plan. Preserve the container’s deployment parameters, alias configuration, proxy virtual host, and certificate renewal configuration so the service can be recreated consistently.
Troubleshoot failures by symptom
Nextcloud says it cannot connect to Collabora
- Confirm that the URL under Administration settings → Office is the public HTTPS office hostname, not
127.0.0.1, a Docker service name, or an HTTP URL. - Resolve the office hostname from a client network and confirm that the certificate name and chain are valid.
- Check that Apache forwards
/hosting/discovery,/hosting/capabilities, and/browser. - Review Collabora and proxy logs for TLS, DNS, or upstream-connection errors.
The Collabora page opens, but a document will not edit
- Check WebSocket forwarding under
/cool; a normal HTTP response does not prove that the upgrade request reaches the container. - Confirm that the Nextcloud hostname is present in the container’s
aliasgroup1configuration and uses the correct scheme and hostname. - Verify the compatibility
/loolmapping if an older client or integration still requests it. - Open a fresh session after correcting the proxy or alias setting; an already-failed browser tab can retain stale connection state.
Editing is too slow with one-click CODE
Nextcloud characterizes the built-in option as slower and less scalable than a standalone installation. Move to a dedicated Collabora service and give it its own container and proxy path. The documentation does not provide a universal CPU, memory, or user-count threshold, so measure your workload rather than applying an invented sizing rule.
An older tutorial uses different names
Check the manual matching your installed Nextcloud release. The current Nextcloud 35 guide calls the connector Nextcloud Office and identifies Euro-Office as the default backend, with Collabora Online as an alternative. Older articles may use different app names, routes, or branding and should not override the labels shown in your administration interface.
Enterprise support and package platforms
Nextcloud’s enterprise portal states that supported Collabora use requires an Enterprise Subscription with the Collabora option. Without that option, Nextcloud GmbH says it cannot provide support for Collabora installations. This is a support entitlement, not evidence that a self-hosted Collabora deployment technically requires a paid subscription.
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The enterprise portal lists signed 64-bit Linux packages for Debian 11 and 12; Ubuntu 20.04, 22.04, and 24.04; RHEL/CentOS 7; RHEL/CentOS 8; RHEL 9/CentOS Stream 9; SLES 15/openSUSE Leap 15.x; and Docker. Match package instructions to the operating-system and release combination you actually run, and verify current support status before standardizing a fleet.
Pre-launch checklist
- Nextcloud opens reliably at its public HTTPS hostname.
- The office DNS name resolves to the intended proxy.
- Certificates validate for both hostnames.
- Collabora is running and its service port is reachable from the proxy.
- The allowed-host or
aliasgroup1setting contains the exact Nextcloud hostname. - Apache (or your chosen proxy) forwards browser assets, discovery, capabilities, WebSocket traffic under
/cool, the main/coolroute, and the/loolcompatibility path where required. - The Nextcloud Office app is enabled and points to the public Collabora URL.
- A test user can open and save DOCX, XLSX, PPTX, and ODF files.
- You have recorded how to renew certificates, update the container, and roll back a failed update.
Which route should you use?
Use built-in CODE when ease of installation matters most and your personal or small-team workload is modest. Use a dedicated Collabora service when you need better performance, clearer service isolation, or room to scale and you are prepared to operate DNS, TLS, a reverse proxy, and container updates. Use distribution packages when host-level package management is your preferred operating model, and evaluate All In One against the exact Nextcloud version and components you intend to run.
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