Debug Your Application

When deploying your application on the Phala Cloud UI, you can choose between two types of CVM base images: dstack-<version> and dstack-dev-<version>. The dev image allows you to log in to the CVM in the future for debugging purposes. If you opt for a non-dev image, rest assured that no one will have the ability to access your CVM, either physically or remotely.

The dstack-dev-<version> images are not recommended for production environments.

debug-cvm

For example, to enable the use of tool ttypd for logging into your CVM from a web browser, you need to add a ttypd service to your Docker Compose file as shown below:

services:
  alpine-ttypd:
    build: .
    image: hackinglab/alpine-ttyd-bash:3.2
    environment:
    - AUTHOR=e1
    - HL_USER_USERNAME=root
    - HL_USER_PASSWORD=123QWEasd
    ports:
      - 7681:7681
    volumes:
      - /:/host
    network_mode: host
config-ttyd-service

You can then view a specific endpoint for the ttypd service by navigating to "View Details" → "Network." and if you check the Container tab, you will see there is a container running for the ttypd service.

view-ttyd-container

When you open this endpoint in your browser (in this case, https://7c7629f605a50abe5797e1b6bab115fec6b9e7ac-7681.dstack-prod5.phala.network/), you will see a terminal interface. The next step is to install the openssh-client.

The base image is not Debian-based, so you will not be able to use the apt package manager. Instead, you will use the apk package manager.

ttyd-terminal

You can now log in to the CVM using the command ssh root@localhost. As shown below, you can retrieve information about running Docker containers by executing the command docker ps -a within the CVM.

cvm-login
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