Wednesday, April 24, 2024

Better Debugging: How the Signal0ne Docker Extension Uses AI to Simplify Container Troubleshooting

Consider this scenario: You fire up your Docker containers, hit an API endpoint, and … bam! It fails. Now what? The usual drill involves diving into container logs, scrolling through them to understand the error messages, and spending time looking for clues that will help you understand what’s wrong. But what if you could get a summary of what’s happening in your containers and potential issues with the proposed solutions already provided?

In this article, we’ll dive into a solution that solves this issue using AI. AI can already help developers write code, so why not help developers understand their system, too? 

Signal0ne is a Docker Desktop extension that scans Docker containers’ state and logs in search of problems, analyzes the discovered issues, and outputs insights to help developers debug. We first learned about Signal0ne as the winning submission in the 2023 Docker AI/ML Hackathon, and we’re excited to show you how to use it to debug more efficiently. 

2400x1260 debug

Introducing Signal0ne Docker extension: Streamlined debugging for Docker

The magic of the Signal0ne Docker extension is its ability to shorten feedback loops for working with and developing containerized applications. Forget endless log diving — the extension offers a clear and concise summary of what’s happening inside your containers after logs and states are analyzed by an AI agent, pinpointing potential issues and even suggesting solutions. 

Developing applications these days involves more than a block of code executed in a vacuum. It is a complex system of dependencies, and different user flows that need debugging from time to time. AI can help filter out all the system noise and focuses on providing data about certain issues in the system so that developers can debug faster and better. 

Docker Desktop is one of the most popular tools used for local development with a huge community, and Docker features like Docker Debug enhance the community’s ability to quickly debug and resolve issues with their containerized apps.

Signal0ne Docker extension’s suggested solutions and summaries can help you while debugging your container or editing your code so that you can focus on bringing value as a software engineer. The term “developer experience” is often used, but this extension focuses on one crucial aspect: shortening development time. This translates directly to increased productivity, letting you build containerized applications faster and more efficiently.

How does the Docker Desktop extension work?

Between AI co-pilots, highly integrated in IDEs that help write code, and browser AI chats that help understand software development concepts in a Q&A way, there is one piece missing: logs and runtime system data. 

The Signal0ne Docker Desktop extension consists of three components: two hosted on the user’s local system (UI and agent) and one in the Signal0ne cloud backend service. The agent scans the user’s local environment in the search of containers with invalid states, runtime issues, or some warnings or errors in the logs, after issue discovery, it collects additional data from container definition for enhanced analysis. 

After the Signal0ne agent discovery, data is sent to the backend service, where a combination of pre-trained LLM and solution search retrieval service performs the analysis. The analysis of the issues can be seen from the Signal0ne extension UI, including: 

  • Short log summary — Outlines what is happening within a particular container, including logs on which analysis was based can be accessed from the sources dropdown if you wish.
  • Solutions summary — One paragraph about possible solutions to the analyzed issue with some explanation of why this particular solution was proposed.
  • Solution sources — Links to websites where the issue has already been solved by the community (for example, a GitHub issue or StackOverflow post).

Watch this short video demonstration for more details: 

Technical details

The issue analysis pipeline is powered by the LangChain tooling framework, which utilizes open source Mistral 7b LLM with LLM-optimized web search that browses sources of existing solutions on the open web (Figure 1).

 Illustration of Signal0ne architecture showing local development containers, UI, agent, backend service, Mistral 7b LLM, and search API.
Figure 1: Signal0ne architecture overview.

The following section shows sample issue analysis pipeline output:

Logs from Docker container:

“$ irb\n>> \"12341:asdf\"[/\\d+/]\n# => \"12341\"  \n>> \"12341:asdf\"[/\\d*/]\n# => \"12341\"  \n>> \"12341:asdf\"[0..5]\n# => \"12341:\"  \n>> \"12341:asdf\"[0...5]\n# => \"12341\"  \n>> \"12341:asdf\"[0, ':']\nTypeError: can't convert String into Integer\n  from (irb):5:in”


The user is trying to extract a substring from the string 12341:asdf using different Ruby methods, such as [/\\\\d+/], [/\\\\d\\\\*/], [0..5], [0...5], and [0, ':']. However, when attempting to use the indexing method [0, ':'], an error occurs because the method expects an integer argument but receives a string instead.

Predicted solutions: 

“To extract a substring from the given string 12341:asdf without encountering an error when using indexing methods, consider the following options:

1. Using regular expressions:

To extract a substring using regular expressions, you can use the scan method with a regular expression pattern. For instance, to extract the digits before the colon, you can use the following code snippet:

                                str = "12341:asdf"                           
                                substring = str.scan(/[\\\\d]+/)                          
                                puts substring.first
                                # Output: ["12341"]                         
                                puts substring.first[0]                           
                                # Output: 12341

2. Slicing:

Another alternative to indexing is slicing, which allows you to extract a specified range of characters from a string. To extract the digits before the colon using slicing, you can use the following code snippet:

str = "12341:asdf"                       
           substring = str[0...str.index(":")]                         
               puts substring               
           # Output: "12341"                         
           puts substring.to_i                           
           # Output: 12341 

These two methods should help you extract the desired substring from the given string without encountering an error.

Getting started

Getting started with the Signal0ne Docker Desktop extension is a straightforward process that allows developers to leverage the benefits of unified development. 

Here are the steps for installing Signal0ne Docker extension:

1. Install Docker Desktop.

2. Choose Add Extensions in the left sidebar. The Browse tab will appear by default (Figure 2).

Screenshot of Docker Desktop Extensions Marketplace highlighting "Add Extensions" option and "Browse" tab.
Figure 2: Signal0ne extension installation from the marketplace.

3. In the Filters drop-down, select the Utility tools category.

4. Find Signal0ne and then select Install (Figure 3).

Screenshot of Signal0ne installation process.
Figure 3: Extension installation process.

5. Log in after the extension is installed (Figure 4).

Screenshot of Signal0ne login page.
Figure 4: Signal0ne extension login screen.

6. Start developing your apps, and, if you face some issues while debugging, have a look at the Signal0ne extension UI. The issue analysis will be there to help you with debugging.

Make sure the Signal0ne agent is enabled by toggling on (Figure 5):

Screenshot of Signal0ne Agent Settings toggle bar.
Figure 5: Agent settings tab.

Figure 6 shows the summary and sources:

Screenshot of Signal0ne page showing search criteria and related insights.
Figure 6: Overview of the inspected issue.

Proposed solutions and sources are shown in Figures 7 and 8. Solutions sources will redirect you to a webpage with predicted solution:

Screenshot of Signal0ne page showing search criteria and proposed solutions.
Figure 7: Overview of proposed solutions to the encountered issue.
Screenshot of Signal0ne page showing search criteria and related source links.
Figure 8: Overview of the list of helpful links.

If you want to contribute to the project, you can leave feedback via the Like or Dislike button in the issue analysis output (Figure 9).

Screenshot of Signal0ne sources page showing thumbs up/thumbs down feedback options at the bottom.
Figure 9: You can leave feedback about analysis output for further improvements.

To explore Signal0ne Docker Desktop extension without utilizing your containers, consider experimenting with dummy containers using this docker compose to observe how logs are being analyzed and how helpful the output is with the insights:

  broken_bulb: # c# application that cannot start properly
    image: 'Signal0neai/broken_bulb:dev'
  faulty_roger: # 
    image: 'Signal0neai/faulty_roger:dev'
  smoked_server: # nginx server hosting the website with the miss-configuration
    image: 'Signal0neai/smoked_server:dev'
      - '8082:8082'
  invalid_api_call: # python webserver with bug 
   image: 'Signal0neai/invalid_api_call:dev'
    - '5000:5000'
  • broken_bulb: This service uses the image Signal0neai/broken_bulb:dev. It’s a C# application that throws System.NullReferenceException during the startup. Thanks to that application, you can observe how Signal0ne discovers the failed container, extracts the error logs, and analyzes it.
  • faulty_roger: This service uses the image Signal0neai/faulty_roger:dev. It is a Python API server that is trying to connect to an unreachable database on localhost.
  • smoked_server: This service utilizes the image Signal0neai/smoked_server:dev. The smoked_server service is an Nginx instance that is throwing 403 forbidden while the user is trying to access the root path ( Signal0ne can help you debug that.
  • invalid_api_call: API service with a bug in one of the endpoints, to generate an error call  after running the container. Follow the analysis of Signal0ne and try to debug the issue.


Debugging containerized applications can be time-consuming and tedious, often involving endless scrolling through logs and searching for clues to understand the issue. However, with the introduction of the Signal0ne Docker extension, developers can now streamline this process and boost their productivity significantly.

By leveraging the power of AI and language models, the extension provides clear and concise summaries of what’s happening inside your containers, pinpoints potential issues, and even suggests solutions. With its user-friendly interface and seamless integration with Docker Desktop, the Signal0ne Docker extension is set to transform how developers debug and develop containerized applications.

Whether you’re a seasoned Docker user or just starting your journey with containerized development, this extension offers a valuable tool that can save you countless hours of debugging and help you focus on what matters most — building high-quality applications efficiently. Try the extension in Docker Desktop today, and check out the documentation on GitHub.

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