Docker

Updating container using docker-compose

To list all containers:

Setting up Apache Guacamole using Docker

Visit: https://github.com/boschkundendienst/guacamole-docker-compose

Follow instructions which in short are:

  1. git clone "https://github.com/boschkundendienst/guacamole-docker-compose.git"
  2. cd guacamole-docker-compose
  3. Edit docker-compose.yml to suite your environment
  4. ./prepare.sh
  5. docker compose up -d

If you want to add TOTP then do the following:

  1.  In your docker-compose.yml file add
    • Environment variable: GUACAMOLE_HOME=/config/guacamole
    • Mount ./guacamole:/config/guacamole
  2. Create in your docker directory

After adding the above extension, restart the container.

 

Troubleshooting Docker

Check Environment Variables Inside the Container: 

sudo docker exec -it container-name env

Review Logs:

sudo docker logs container-name
sudo docker-compose up -d && sudo docker-compose logs -f

 

Paperless: ProtonMail Bridge

Source code: shenxn/protonmail-bridge-docker: ProtonMail IMAP/SMTP Bridge Docker container (github.com)

Change to the Paperless docker directory

sudo docker compose down
sudo docker run --rm -it -v protonmail:/root shenxn/protonmail-bridge init

Enter "login" to connect the ProtonMail account. Once complete, type "info" to get the login details that will be used in the Paperless mail interface.

Exit the instance (using control-c if necessary).

Bring paperless up again.

sudo docker compose up -d

Configure and test the mail settings

image.png

Your URLS

 

version: '3.1'

services:

  yourls:
    image: yourls
    restart: always
    ports:
      - 8080:80
    volumes:
      - /home/sysadmin/yourls:/var/www/html
    environment:
      YOURLS_DB_PASS: dbpwd
      YOURLS_SITE: https://192.168.20.40:8080/
      YOURLS_USER: osgadmin
      YOURLS_PASS: yourlspwd

  mysql:
    image: mysql
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: dbpwd
      MYSQL_DATABASE: yourls

Cloudflare

version: "3.9"
services:

  tunnel:
    container_name: cloudflared-tunnel
    image: cloudflare/cloudflared
    restart: unless-stopped
    command: tunnel run
    environment:
      - TUNNEL_TOKEN=token................


Updating a docker container running on QNAP using SSH

SSH enabled on your QNAP NAS

1. Identify the Container and Image Name

Option A: Using Container Station GUI

  1. Open Container Station.

  2. Navigate to the Containers tab.

  3. Click on the target container to view details.

  4. Locate the Image field — this is the image used (e.g., linuxserver/nextcloud:latest).

Option B: Using SSH

ssh admin@<your-nas-ip> docker ps

Copy the container name (e.g., nextcloud) and run:

docker inspect --format='{{.Config.Image}}' <container-name>

This returns the image name, e.g.:

linuxserver/nextcloud:latest

2. Back Up Container Volumes (Optional but Recommended)

Check volume mappings:

docker inspect <container-name> | grep -A 10 "Mounts"

Back up the volume path if necessary. For example, if a volume is mounted to /share/Container/nextcloud/config, back that up using QNAP File Station or rsync.

3. Pull the Latest Docker Image

docker pull <image-name>

Example:

docker pull linuxserver/nextcloud:latest

4. Stop and Remove the Old Container

docker stop <container-name> docker rm <container-name>

Example:

docker stop nextcloud docker rm nextcloud

⚠️ This does not delete the image or volume data.

5. Recreate the Container with Same Settings

Get Existing Settings (Ports, Volumes, Env Vars)

Use:

docker inspect <container-name>

Note the following:

Re-run the Container

Example:

docker run -d \ --name nextcloud \ -e PUID=1000 \ -e PGID=1000 \ -e TZ=Europe/London \ -p 8080:80 \ -v /share/Container/nextcloud/config:/config \ -v /share/Container/nextcloud/data:/data \ linuxserver/nextcloud:latest

Replace volume paths, ports, and environment variables based on what you had before.

6. Verify Everything Works

7. (Optional) Remove Old Images

List unused images:

docker images

Clean up dangling images:

docker image prune

Or remove a specific old image manually:

docker rmi <image-id>
Bonus: Automatically Extract and Re-run a Container

To automatically generate a docker run command:

docker run --rm \ -v /var/run/docker.sock:/var/run/docker.sock \ red5d/docker-autocompose <container-name> > recreate-container.yml

Then review or convert the output back into a run command.