seleniumのwebdriver(chromedriver)が起動しない。

前提・実現したいこと

webブラウザーで対象のURLを渡して、VPS上でseleniumを起動して渡されたURLのスクリーンショットを取ろうとしているのですが
エラーが出て起動しません。起動するための助言をお願いいたします。

環境

VPS(CentOS7)
nginx 1.12.2
uWSGI
python3.6
flask
ChromeDriver 2.36.540471

発生している問題・エラーメッセージ

Traceback (most recent call last):
  File "/usr/local/pyenv/versions/3.6.1/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/pyenv/versions/3.6.1/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/pyenv/versions/3.6.1/lib/python3.6/site-packages/flask_cors/extension.py", line 161, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/usr/local/pyenv/versions/3.6.1/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/pyenv/versions/3.6.1/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/usr/local/pyenv/versions/3.6.1/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/pyenv/versions/3.6.1/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "./api/route_api_walls.py", line 56, in create_walls_data
    selenium_util = libs.SeleniumUtility(request_form_dict['url'])
  File "./libs/seleniumutility.py", line 35, in __init__
    self.driver = webdriver.Chrome(chrome_options=opts,executable_path=self.driver_location,service_log_path=self.service_log_path)
  File "/usr/local/pyenv/versions/3.6.1/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 86, in __init__
    desired_capabilities=desired_capabilities)
  File "/usr/local/pyenv/versions/3.6.1/lib/python3.6/site-packages/selenium/webdriver/remote/webdriver.py", line 155, in __init__
    self.start_session(desired_capabilities, browser_profile)
  File "/usr/local/pyenv/versions/3.6.1/lib/python3.6/site-packages/selenium/webdriver/remote/webdriver.py", line 244, in start_session
    response = self.execute(Command.NEW_SESSION, parameters)
  File "/usr/local/pyenv/versions/3.6.1/lib/python3.6/site-packages/selenium/webdriver/remote/webdriver.py", line 318, in execute
    self.error_handler.check_response(response)
  File "/usr/local/pyenv/versions/3.6.1/lib/python3.6/site-packages/selenium/webdriver/remote/errorhandler.py", line 246, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: unknown error: Chrome failed to start: exited abnormally
  (Driver info: chromedriver=2.36.540471 (9c759b81a907e70363c6312294d30b6ccccc2752),platform=Linux 3.10.0-693.17.1.el7.x86_64 x86_64)

該当のソースコード

python
1# -*- coding: utf-8 -*-
2
3from __future__ import absolute_import, division, print_function
4from pyvirtualdisplay import Display
5from selenium import webdriver
6from selenium.webdriver.chrome.options import Options
7from datetime import datetime
8from PIL import Image
9import time,os
10
11class SeleniumUtility:
12    chromeservice = None
13    driver = ""
14    display = ""
15
16    screen_shot_path = "/var/www/xxxxx/xxxxxx/static/img/thumbnails/"
17    view_image_path = "/static/img/thumbnails/"
18    browser_path = '/usr/bin/google-chrome'
19    driver_location = '/usr/local/bin/chromedriver'
20    service_log_path = '/var/log/selenium_service.log'
21
22    def __init__(self, url):
23        self.display = Display(visible=0, size=(1366, 768))
24        self.display.start()
25
26        os.environ["HOME"] = "/home/chrome"
27
28        opts = Options()
29        opts.binary_location = self.browser_path
30        opts.add_argument('--headless')
31        opts.add_argument('--disable-gpu')
32        opts.add_argument('--no-sandbox')
33        #opts.add_argument('user-data-dir=/var/www/xxxxx/xxxxxx/chrome_tmp')
34        self.driver = webdriver.Chrome(chrome_options=opts,executable_path=self.driver_location,service_log_path=self.service_log_path)
35        self.driver.get(url)
36        time.sleep(2)
37
38    def screenshot(self, screen_shot_path=None):
39        file_name = datetime.now().strftime("%Y%m%d%H%M%S") + ".png"
40        if screen_shot_path is None:
41            screen_shot_path = self.screen_shot_path + file_name
42
43        self.driver.save_screenshot(screen_shot_path)
44
45        img = Image.open(screen_shot_path, 'r')
46        img.thumbnail((455, 256), Image.ANTIALIAS)
47        img.save(self.screen_shot_path + "th_" + file_name, 'PNG', quality=100, optimize=True)
48        return self.view_image_path + "th_" + file_name
49
50    def title(self):
51        return self.driver.title
52
53    def contents(self):
54        return self.driver.page_source
55
56    def close(self):
57        self.driver.close()
58        self.driver.quit()
59        self.display.stop()

nginx
1   location / {
2        include uwsgi_params;
3        uwsgi_read_timeout 3000;
4        uwsgi_pass unix:/var/www/xxxxx/xxxxxx/xxxxxx.sock;
5    }

uwsgi
1[uwsgi]
2uid =nginx
3gid = nginx
4
5chdir = /var/www/xxxxx/xxxxxx
6
7app = index:app
8
9module = %(app)
10
11callable = app
12
13logto = /var/log/uwsgi/%n.log
14
15master = true
16processes = 5
17
18socket = xxxxxx.sock
19chmod-socket =666
20vacuum = true
21
22die-on-term = true
23

試したこと

成功

Supervisorを立ち上げて、flaskのサーバーで試してみたところ問題なく実行できました。
pythonのクラスを直接呼び出し試してみたところ問題なく実行できました。(sudo -u nginx class_selenium_test.py)

失敗

nginxがhttpsで動かしていてwebdriverのlocalserverがhttpがデフォルトになっていたのでhttpsに書き換えても実行できませんでした。
Xvfbをpyvirtualdisplayではなく常にバックグラウンドで動かしDISPLAY番号をexportしても実行できませんでした。
webdriverをRemote経由で呼び出しても実行できませんでした。ただし、クラス直接呼び出しだとをChomeで直接呼び出した時と同様に実行できました。

補足情報（FW/ツールのバージョンなど）

nginx経由だとlocalhostが見つけられてない感じがします。
SELinuxはdisabledにしています。
Supervisorはhttpですが、nginxはhttpsで動かしています。

class_selenium_test.py

python
1import sys,os
2sys.path.append(os.pardir)
3import libs
4
5selenium =libs.SeleniumUtility('https://www.google.co.jp/')
6print(selenium.title())
7selenium.close()