Hero and mdbook on a Full VM

<h1>Hero and mdbook on a Full VM</h1>

<h2>Table of Contents</h2>

- [Introduction](#introduction)
- [Setting the Full VM](#setting-the-full-vm)
  - [Remote Explorer Access](#remote-explorer-access)
  - [Install cargo and mdbook](#install-cargo-and-mdbook)
  - [Install redis](#install-redis)
  - [Install pkg-config, gcc and libssl](#install-pkg-config-gcc-and-libssl)
- [Set Hero](#set-hero)
- [Generate the mdbook](#generate-the-mdbook)
- [Serve and View the mdbook](#serve-and-view-the-mdbook)
- [Questions and Feedback](#questions-and-feedback)

***

## Introduction

In this tutorial, we show all the steps to deploy an mdbook with the [hero](https://github.com/freeflowuniverse/crystallib/tree/development/cli/hero) tool. 

For this guide, we show an example using the mdbook from the repository [info_tfgrid](https://git.ourworld.tf/tfgrid/info_tfgrid). This setup can be done locally or on a VM. Note that it should be run as root. 

We show the steps for a full VM deployed on the TFGrid with WireGuard. We use `10.20.4.2` as a WireGuard IP address. Adjust according to your own setup.

We will be using SSH to connect to the VM and to create an SSH tunnel between the local machine and the VM. This will allow the mdbook output to be displayed on a local browser.

To manage the mdbook files, we will be using the remote explorer feature of either VSCodium or VSCode.

## Setting the Full VM 

We start by deploying a full VM with WireGuard on the TFGrid. We also set an SSH tunnel.

- Deploy a full VM with WireGuard on the TFGrid
- Set an SSH tunnel, on port 3333 for both local and VM
    ```
    ssh -4 -L 3333:127.0.0.1:3333 root@10.20.4.2
    ```

Instead of working on the SSH tunnel terminal window, we will be using the remote explorer feature of a source-code editor.

### Remote Explorer Access

You can use the remote explorer feature of both [VSCode](https://marketplace.visualstudio.com/items?itemName=ms-vscode.remote-repositories) and [VSCodium](https://open-vsx.org/extension/jeanp413/open-remote-ssh) to manage the mdbook.

- Open the window `Remote Explorer`, click on `Add New` and write the following in the SSH config file:
    ```
    Host 10.20.4.2
        HostName 10.20.4.2
        User root
    ```
- Click on `Connect to Host`
- Open the main `/root` directory
- Right-click on the main window of the directory and select `Open in Integrated Terminal`
- Update and upgrade the VM
    ```
    apt update && apt upgrade -y
    ```

### Install cargo and mdbook

- Install cargo rust for linux and mac (with default installation)
    ```
    curl https://sh.rustup.rs -sSf | sh
    ```
- Configure the current shell
    ```
    source "$HOME/.cargo/env"
    ```
- Install mdbook
    ```
    cargo install mdbook
    ```

### Install redis

- Install redis on the VM
    ```
    apt install lsb-release curl gpg
    curl -fsSL https://packages.redis.io/gpg | gpg --dearmor -o /usr/share/keyrings/redis-archive-keyring.gpg
    echo "deb [signed-by=/usr/share/keyrings/redis-archive-keyring.gpg] https://packages.redis.io/deb $(lsb_release -cs) main" | tee /etc/apt/sources.list.d/redis.list
    apt-get update
    apt-get install redis -y
    ```

### Install pkg-config, gcc and libssl

- Install other packages
    ```
    apt install pkg-config -y
    apt-get install gcc -y
    apt install libssl-dev
    ```

## Set Hero

- Download the hero installation script
    ```
    curl https://raw.githubusercontent.com/freeflowuniverse/crystallib/development/scripts/installer_hero.sh > /tmp/hero_install.sh
    ```
- Run the script as root
    ```
    bash /tmp/hero_install.sh
    ```
- Run hero to confirm the installation is done properly
    ```
    hero -help
    ```

## Generate the mdbook

- Start the ssh-agent
    ```
    eval $(ssh-agent)
    ```
- Generate the mdbook with hero
    ```
    hero mdbook -u https://git.ourworld.tf/tfgrid/info_tfgrid/src/branch/main/heroscript
    ```
- Change directory to where the book is built
    ```
    cd /root/hero/var/mdbuild/book_name
    ```
- You can then edit the content of the book as with any mdbook
    ```
    mdbook build
    ```

## Serve and View the mdbook

- To serve on your local machine, make sure to use the same part as the one set in your SSH tunnel (here it's port 3333)
    ```
    mdbook serve --port 3333 
    ```
- To see the mdbook live, open a browser on the local machine and go to localhost:3333

## Questions and Feedback

If you have any questions or feedback, please let us know by either writing a post on the [ThreeFold Forum](https://forum.threefold.io/), or by chatting with us on the [TF Grid Tester Community](https://t.me/threefoldtesting) Telegram channel.