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update readme of Nextcloud, to document preview generator usage

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hooger 2023-09-18 13:02:54 +02:00
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docs/services/nextcloud.md
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@ -259,3 +259,31 @@ This will install and configure the [Office](https://apps.nextcloud.com/apps/ric
You should then be able to click any document (`.doc`, `.odt`, `.pdf`, etc.) in Nextcloud Files and it should automatically open a Collabora Online editor. You should then be able to click any document (`.doc`, `.odt`, `.pdf`, etc.) in Nextcloud Files and it should automatically open a Collabora Online editor.
You can also create new documents via the "plus" button. You can also create new documents via the "plus" button.
### Preview Generator
It is possible to setup preview generation, using this playbook.
First modify your `vars.yml` file by adding at least the following line (other options are also present, check the corresponding `defaults/main.yml` file):
```yaml
nextcloud_preview_enabled: true
```
then install Nextcloud (or rerun the playbook if already installed).
Next, from the Settings/Application menu in your Nextcloud instance install the preview generator app (https://apps.nextcloud.com/apps/previewgenerator).
After the application is installed run `just run-tags adjust-nextcloud-config` that will start the original preview-generation and when finished, enables the periodic generation of new images.
The original generation may take a long time, but a continuous prompt is presented by ansible as some visual feedback (it is being run as an async task), however it will timeout after approximately 27 hours.
On 60GBs, most of the data being images, it took about 10 minutes to finish.
If it takes more time to run than a day, you may want to start it from the host by calling
```sh
/usr/bin/env docker exec mash-nextcloud-server php /var/www/html/occ preview:generate-all
```
Also, please note: every time Nextcloud version is updated, you should rerun: `just run-tags adjust-nextcloud-config`.