Red Hat 8下pip3安装docker-compose失败问题求助

Hey there, let's figure out why your pip3 can't connect to PyPI even with the proxy set up. That NewConnectionError: [Errno -2] Name or service not known error tells us pip can't reach or resolve the PyPI servers—and it's affecting all your pip installs, not just docker-compose. Here are actionable steps to fix this:

1. Validate Your Proxy Setup (and Fix Special Characters) #

First, your proxy password includes ++, which are special characters in URLs. These need to be URL-encoded (replace + with %2B) for tools like pip and curl to recognize them correctly.

• Test if your proxy can reach PyPI with curl (use encoded password):

  curl -x http://E10697:xxxxxx%2B%2B@10.162.64.36:8080 https://pypi.org/simple/docker-compose/
  

• If this curl command fails, double-check your proxy server address, port, and account credentials—there’s likely an issue with the proxy itself (e.g., wrong port, expired password).

2. Configure pip to Use the Proxy Directly #

Sometimes system environment variables for proxy don’t get picked up by pip reliably. Create a dedicated pip config file to ensure it uses your proxy:

For your user account (no sudo needed): #

1. Create the pip config directory if it doesn’t exist:

   mkdir -p ~/.config/pip
   

2. Create ~/.config/pip/pip.conf with this content (use your encoded password):

   [global]
   proxy = http://E10697:xxxxxx%2B%2B@10.162.64.36:8080
   

If you need to use sudo: #

Repeat the above steps for the root user—create /root/.config/pip/pip.conf with the same proxy line. This ensures pip uses the proxy even when run with sudo.

3. Check System DNS Resolution #

The "Name or service not known" error can also mean your system can’t resolve PyPI’s domain names. Test this with:

nslookup pypi.org

If this returns an error, check your /etc/resolv.conf file to ensure it has valid DNS servers (ask your system admin for correct DNS settings if needed). Even with a proxy, the proxy server needs to resolve domain names, or your system needs to send DNS queries through the proxy.

4. Try a PyPI Mirror (If Proxy Issues Persist) #

If you still can’t get the proxy working, use a domestic PyPI mirror to bypass the PyPI main server. Install docker-compose with:

pip3 install docker-compose --user -i https://mirrors.aliyun.com/pypi/simple/

Note: The --user flag avoids using sudo (which the warning recommends) and installs the package to your user directory instead of system-wide.

5. Verify the Fix #

After trying the above steps, run the install command again:

pip3 install docker-compose --user

This should now connect to PyPI successfully and install docker-compose.

内容的提问来源于stack exchange，提问作者Arturo29