If you are using an outdated pip version, it is possible a prebuilt wheel is available for this package but pip is not able to install from it. Installing from the wheel would avoid the need for a Rust compiler.

    To update pip, run:

        pip install --upgrade pip

    and then retry package installation.

    If you did intend to build this package from source, try installing a Rust compiler from your system package manager and ensure it is on the PATH during installation. Alternatively, rustup (available at https://rustup.rs) is the recommended way to download and update the Rust compiler toolchain.

    This package requires Rust >=1.41.0.

    ----------------------------------------
Command "/usr/local/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-y4avi50u/cryptography/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-epkin13o/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-install-y4avi50u/cryptography/
You are using pip version 18.1, however version 21.3.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
[root@dbmon ~]# pip3 install --upgrade pip3
Collecting pip3
  Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)",)': /simple/pip3/
  Could not find a version that satisfies the requirement pip3 (from versions: )
No matching distribution found for pip3
You are using pip version 18.1, however version 21.3.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

解决方法:
[root@dbmon ~]# python3 -m pip install --upgrade pip -i https://pypi.douban.com/simple

[root@dbmon ~]# python3 -m pip install paramiko