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# Setting up Cactus Comments (optional)
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The playbook can install and configure [Cactus Comments](https://cactus.chat) for you.
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Cactus Comments is a **federated comment system** built on Matrix. The role allows you to self-host the system.
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It respects your privacy, and puts you in control.
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See the project's [documentation](https://cactus.chat/docs/getting-started/introduction/) to learn what it
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does and why it might be useful to you.
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## Configuration
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Add the following block to your `vars.yaml` and make sure to exchange the tokens to randomly generated values.
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```yaml
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#################
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## Cactus Chat ##
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#################
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matrix_cactus_comments_enabled: true
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# To allow guest comments without users needing to log in, you need to have guest registration enabled.
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# To do this you need to uncomment one of the following lines (depending if you are using synapse or dentrite as a homeserver)
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# If you don't know which one you use: The default is synapse ;)
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# matrix_synapse_allow_guest_access: true
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# matrix_dentrite_allow_guest_access: true
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```
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## Installing
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After configuring the playbook, run the [installation](installing.md) command again:
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```
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ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start
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```
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## Usage
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Upon starting Cactus Comments, a `bot.cactusbot` user account is created automatically.
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To get started, send a `help` message to the `@bot.cactusbot:your-homeserver.com` bot to confirm it's working.
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Then, register a site by typing: `register <sitename>`. You will then be invited into a moderation room.
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Now you are good to go and can include the comment section on your website!
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**Careful:** To really make use of self-hosting you need change a few things in comparison to the official docs!
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Insert the following snippet into you page and make sure to replace `example.com` with your base domain!
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```html
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<script type="text/javascript" src="https://matrix.example.com/cactus-comments/cactus.js"></script>
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<link rel="stylesheet" href="https://matrix.example.com/cactus-comments/style.css" type="text/css">
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<div id="comment-section"></div>
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<script>
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initComments({
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node: document.getElementById("comment-section"),
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defaultHomeserverUrl: "https://matrix.example.com:8448",
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serverName: "example.com",
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siteName: "YourSiteName",
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commentSectionId: "1"
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})
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</script>
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```
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