How to use Nocalhost and enable debugging in Python

Nocalhost is a developer tool that supports debugging and deployment of Kubernetes applications. Using Nocalhost for Python development requires completing the following steps:

• Install Nocalhost CLI. It can be installed through the installation package provided by Nocalhost official website.

• Configure the Kubernetes cluster and install the Nocalhost plug-in. You can refer to the guidance provided in Nocalhost official documentation.

• Install the Python interpreter and debugger on the local computer, such as Python's own pdb or third-party libraries pudb, ipdb, etc.

• Create a Python project and add the debugger calling statement in the code, for example:

import pdb

def my_function():
    x = 1
    y = 2
    pdb.set_trace() # 在这里设置断点
    z = x + y
    return z

my_function()

5. Use the Nocalhost CLI command line The tool creates a local agent and a remote development environment. For example:

$ nhctl debug create your-app-name --image your-image-name:your-tag

where your-app-name is the name of the application you want to debug, and your-image-name:your-tag represents the Docker image you want to debug.

6. Start the local agent and remote development environment. For example:

$ nhctl debug start your-app-name

7. Connect to the remote development environment through an IDE such as VSCode on the local computer.

8. Open your Python project in VSCode and add a launch.json configuration file. For example:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Python: Remote Debug",
            "type": "python",
            "request": "attach",
            "connect": {
                "host": "${command:NH_REMOTE_CONNECT_HOST}",
                "port": ${command:NH_REMOTE_CONNECT_PORT}
            },
            "pathMappings": [
                {
                    "localRoot": "${workspaceFolder}",
                    "remoteRoot": "/app"
                }
            ]
        }
    ]
}

where NH_REMOTE_CONNECT_HOST and NH_REMOTE_CONNECT_PORT are environment variables provided by the Nocalhost CLI command line tool, used to specify the remote connection host and port number.

9. Start debugging in VSCode, and use VSCode debugging tools or debuggers such as pdb, pudb, ipdb, etc. on the local computer to debug.

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