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Proxy環境下でpipが[Errno 8] nodename nor servname provided, or not knownで失敗

f:id:lirlia:20170707110613p:plain

Proxy配下でpipを使用した時に発生したエラーの回避策を書いておきます。

環境情報

  • Mac OSX 10.11.3(15D21)
  • python 2.7.11
  • pip 8.1.2

発生した問題

$ sudo pip install virtualenv --proxy http://[user]:[password]@[server]:[port] -vvv

The directory '/Users/User/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/User/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting virtualenv
  1 location(s) to search for versions of virtualenv:
  * https://pypi.python.org/simple/virtualenv/
  Getting page https://pypi.python.org/simple/virtualenv/
  Looking up "https://pypi.python.org/simple/virtualenv/" in the cache
  No cache entry available
  Starting new HTTPS connection (1): pypi.python.org
  Incremented Retry for (url='/simple/virtualenv/'): Retry(total=4, connect=None, read=None, redirect=None)
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x10a623a10>: Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known',))': /simple/virtualenv/

pipでproxy設定をするときは--proxyをつけておけば良いと公式ドキュメントにも書かれていたのですが、どうも自分の環境だとうまくいかず-vvvオプションをつけて確認してみました。

すると、こんなエラーが出てきてきました。

Collecting virtualenv
  1 location(s) to search for versions of virtualenv:
  * https://pypi.python.org/simple/virtualenv/
  Getting page https://pypi.python.org/simple/virtualenv/
  Looking up "https://pypi.python.org/simple/virtualenv/" in the cache
  No cache entry available
  Starting new HTTPS connection (1): pypi.python.org
  Incremented Retry for (url='/simple/virtualenv/'): Retry(total=4, connect=None, read=None, redirect=None)

よくよーく注目するとアクセスしに行ってるページがhttpsでは…?

もしかして--proxyってhttp_proxyと同じでhttp向け通信しかproxy経由にしない?

そんなバカな・・・と思いながらも試してみます。

$ sudo https_proxy=http://[user]:[password]@[server]:[port] pip install virtualenv
The directory '/Users/User/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/User/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting virtualenv
  Downloading virtualenv-15.1.0-py2.py3-none-any.whl (1.8MB)
    100% |████████████████████████████████| 1.8MB 605kB/s
Installing collected packages: virtualenv
Successfully installed virtualenv
You are using pip version 8.1.2, however version 9.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

できた・・・

え、そういうことなのか。