FlashPaper is a one-time encrypted zero-knowledge password/secret sharing application focused on simplicity and security. No database or complicated setup required. In this step by step guide I will show you how to install FlashPaper on your Synology NAS using Docker.

💡Note: This guide works perfectly with the latest FlashPaper v2.2.4 release.

• STEP 1

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• STEP 2

Install Portainer using my step by step guide. If you already have Portainer installed on your Synology NAS, skip this STEP. Attention: Make sure you have installed the latest Portainer version.

• STEP 3

Make sure you have a synology.me Wildcard Certificate. Follow my guide to get a Wildcard Certificate. If you already have a synology.me Wildcard certificate, skip this STEP.

• STEP 4

Go to Control Panel / Login Portal / Advanced Tab / click Reverse Proxy. Follow the instructions in the image below.

• STEP 5

Now click the “Create” button. Follow the instructions in the image below.

• STEP 6

After you click the Create button, the window below will open. Follow the instructions in the image below.

On the General area, set the Reverse Proxy Name description: type in FlashPaper. After that, add the following instructions:

Source:
Protocol: HTTPS
Hostname: flashpaper.yourname.synology.me
Port: 443

Check Enable HSTS

Destination:
Protocol: HTTP
Hostname: localhost
Port: 6800

• STEP 7

On the Reverse Proxy Rules click the Custom Header tab. Click Create and then, from the drop-down menu, click WebSocket. After you click on WebSocket, two Header Names and two Values will be automatically added. Click Save. Follow the instructions in the image below.

• STEP 8

Go to Control Panel / Network / Connectivity tab/ Check Enable HTTP/2 then click Apply. Follow the instructions in the image below.

• STEP 9

Go to Control Panel / Security / Advanced tab/ Check Enable HTTP Compression then click Apply. Follow the instructions in the image below.

• STEP 10

Go to File Station and open the docker folder. Inside the docker folder, create one new folder and name it flashpaper. Follow the instructions in the image below.
Note: Be careful to enter only lowercase, not uppercase letters.

• STEP 11

Log into Portainer using your username and password. On the left sidebar in Portainer, click on Stacks then + Add stack. Follow the instructions in the image below.

• STEP 12

In the Name field type in flashpaper. Follow the instructions in the image below.

Note: Copy Paste the code below in the Portainer Stacks Web editor.

version: "3.9"
services:
  flashpaper:
    image: ghcr.io/andrewpaglusch/flashpaper:v2
    container_name: FlashPaper
    restart: on-failure:5
    volumes:
      - /volume1/docker/flashpaper:/var/www/html/data:rw
    ports:
      - 6800:80
    environment:
      SITE_TITLE: MariusHosting Self-Destructing Message
      RETURN_FULL_URL: true
      MAX_SECRET_LENGTH: 300000
      ANNOUNCEMENT:
      MESSAGES_ERROR_SECRET_TOO_LONG: Input Length Too Long
      MESSAGES_SUBMIT_SECRET_HEADER: Create A Self-Destructing Message
      MESSAGES_SUBMIT_SECRET_SUBHEADER:
      MESSAGES_SUBMIT_SECRET_BUTTON: Encrypt Message
      MESSAGES_VIEW_CODE_HEADER: Self-Destructing URL
      MESSAGES_VIEW_CODE_SUBHEADER: Share this URL Link via Email, Chat, or another Messaging Service. It will Self-destruct after being viewed once.
      MESSAGES_CONFIRM_VIEW_SECRET_HEADER: View This Message?
      MESSAGES_CONFIRM_VIEW_SECRET_BUTTON: View Message
      MESSAGES_VIEW_SECRET_HEADER: Self-Destructing Message
      MESSAGES_VIEW_SECRET_SUBHEADER: This Message has been Destroyed!
      PRUNE_ENABLED: true
      PRUNE_MIN_DAYS: 365
      PRUNE_MAX_DAYS: 730

Note: Before you paste the code above in the Web editor area below, change the value for SITE_TITLE and add your own SITE TITLE. MariusHosting is an example of a SITE_TITLE. You should invent your own Site Title.

• STEP 13

Scroll down on the page until you see a button named Deploy the stack. Click on it. Follow the instructions in the image below. The installation process can take up to a few minutes. It will depend on your Internet speed connection.

• STEP 14

If everything goes right, you will see the following message at the top right of your screen: “Success Stack successfully deployed“.

• STEP 15

Go back to STEP 1 or you will deal with karma 🙂.

• STEP 16

Now open your browser and type in your HTTPS/SSL certificate like this https://flashpaper.yourname.synology.me In my case it’s https://flashpaper.mariushosting.synology.me If everything goes right, you will see the flashpaper page. In the message area type in your own message then click Encrypt Message. You also have the option to select a predefined template. Follow the instructions in the image below.

• STEP 17

Copy the URL and Share with Someone! Follow the instructions in the image below.

• STEP 18

See the link you have previously copied at STEP 17 then click View Message to view the message. Once you view the message once, the message is automatically destroyed. This means that, if you access this same link again, you will get a message saying the message has been destroyed.

Enjoy FlashPaper!

Note: Find out how to update the FlashPaper container with the latest image.
Note: How to Back Up Docker Containers on your Synology NAS.
Note: Can I run Docker on my Synology NAS? See the supported models.
Note: How to Free Disk Space on Your NAS if You Run Docker.
Note: How to Schedule Start & Stop For Docker Containers.
Note: How to Activate Email Notifications.
Note: How to Add Access Control Profile on Your NAS.
Note: How to Change Docker Containers Restart Policy.
Note: How to Use Docker Containers With VPN.
Note: Convert Docker Run Into Docker Compose.
Note: How to Clean Docker.
Note: How to Clean Docker Automatically.
Note: Best Practices When Using Docker and DDNS.
Note: Some Docker Containers Need WebSocket.
Note: Find out the Best NAS Models For Docker.
Note: Activate Gmail SMTP For Docker Containers.

This post was updated on Saturday / February 24th, 2024 at 6:42 AM