Managing FastAPI Projects with Poetry: A Step-by-Step Guide

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This guide will walk you through how to use Poetry to manage dependencies and structure your project in FastAPI . It includes detailed explanations of Poetry's core concepts and commands to help prevent issues that can arise during team collaboration and deployment. 1. What is Poetry? Poetry is a dependency management and packaging tool for Python. It goes beyond simply installing libraries by allowing you to clearly declare the dependencies your project needs and ensuring that all developers on the project have the same library versions. Clarity in Dependency Management : Explicitly manage your project's basic information and required libraries through the pyproject.toml file. Reproducible Builds : By locking all dependency versions in the poetry.lock file, it fundamentally prevents "it works on my machine" problems. Integrated Development Environment : It automatically creates and manages isolated virtual environments for each project and handles mo...
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Resolving Key Exchange Failure When Connecting with SecureCRT to OpenSSH

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Recently, after installing OpenSSH on my Ubuntu 22.04 laptop, I encountered a challenge while trying to establish a connection using SecureCRT.

An error message appeared:

Key exchange failed.
No compatible key-exchange method. The server supports these methods:
  curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,sntrup761x25519-sha512@openssh.com,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,kex-strict-s-v00@openssh.com
The following key-exchange method(s) are supported but not currently allowed for this session:
  curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,sntrup761x25519-sha512@openssh.com,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,kex-strict-s-v00@openssh.com,curve25519-sha256
Key-exchange methods can be turned on in the Session Options dialog in the Connection/SSH2 Category.

This error indicates a mismatch in the key-exchange algorithms supported by the server (OpenSSH in this case) and the client (SecureCRT).

Root Cause:

The root of this issue lies in the key exchange method. SecureCRT and OpenSSH must agree on a method to securely establish a communication channel. When they don't support a common method, you'll encounter this error.

Solution:

To resolve this issue, you need to modify the session settings in SecureCRT to include a key exchange method compatible with your OpenSSH server. Here are the steps:

  1. Open SecureCRT and navigate to the session options for the connection in question.
  2. Go to the SSH2 category.
  3. In the 'Key Exchange' section, add "diffie-hellman-group14-sha256" to the list of methods.

This addition ensures that SecureCRT includes a key exchange algorithm that is compatible with the OpenSSH server, specifically one that the server supports.

You can use SSH client commands to attempt a connection to the server and have it display the list of supported key exchange algorithms. This method is useful when the server is running.

jason@GU502DU:~$ ssh -Q KexAlgorithms
diffie-hellman-group1-sha1
diffie-hellman-group14-sha1
diffie-hellman-group14-sha256 -> (*)
diffie-hellman-group16-sha512
diffie-hellman-group18-sha512
diffie-hellman-group-exchange-sha1
diffie-hellman-group-exchange-sha256

Conclusion:

Key exchange errors can be a common hurdle in setting up secure connections, but they are usually resolvable through configuring the client to support the server's protocols. By understanding and aligning the key exchange methods between your client and server, you can establish a secure and reliable SSH connection.






Location: Coquitlam, BC, Canada

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