Question

我已经启动了ElasticSearch服务，并且在我执行ps aux --sort -rss时可以看到它正在运行。但是，当我使用Python3.4 manage.py loaddata backup.json更新我的数据库时，Haystack和ElasticSearch会从以下开始引发连接错误：

GET http://www.example.com:9200/haystack/_mapping [status:N/A request:0.173s]
Traceback (most recent call last):
  File "/home/myuser/lib/python3.4/urllib3/connectionpool.py", line 544, in urlopen
    body=body, headers=headers)
  File "/home/myuser/lib/python3.4/urllib3/connectionpool.py", line 349, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/usr/local/lib/python3.4/http/client.py", line 1090, in request
    self._send_request(method, url, body, headers)
  File "/usr/local/lib/python3.4/http/client.py", line 1128, in _send_request
    self.endheaders(body)
  File "/usr/local/lib/python3.4/http/client.py", line 1086, in endheaders
    self._send_output(message_body)
  File "/usr/local/lib/python3.4/http/client.py", line 924, in _send_output
    self.send(msg)
  File "/usr/local/lib/python3.4/http/client.py", line 859, in send
    self.connect()
  File "/home/myuser/lib/python3.4/urllib3/connection.py", line 155, in connect
    conn = self._new_conn()
  File "/home/myuser/lib/python3.4/urllib3/connection.py", line 134, in _new_conn
    (self.host, self.port), self.timeout, **extra_kw)
  File "/home/myuser/lib/python3.4/urllib3/util/connection.py", line 88, in create_connection
    raise err
  File "/home/myuser/lib/python3.4/urllib3/util/connection.py", line 78, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

是什么导致这个？我在某处读到了相互矛盾的Java版本可能导致这种情况，并且我确实有多个Java版本，但是当我运行java -version和javac -version时，它们都会根据需要返回1.8.0_45。

settings.py

HAYSTACK_CONNECTIONS = {
    'default': {
        'ENGINE': 'haystack.backends.elasticsearch_backend.ElasticsearchSearchEngine',
        'URL': 'http://www.example.com:9200/',
        'INDEX_NAME': 'haystack',
    },
}

Answer 1

看起来Java Elasticsearch守护程序不活动。您可以通过以下方式查看：

nmap localhost -p 9200

端口状态必须为open。如果它是closed，则您的Java Elasticsearch守护程序现在不起作用。您可以在/var/log/elasticsearch中查看日志中的错误。

此时（2016年11月）在Ubuntu 16.04服务器上运行Elasticsearch守护进程，您需要：openjdk-8-jre和elasticsearch v.2.3.1守护进程。使用openjdk-9-jre Elasticeasrch守护程序将无法启动，Elasticsearch守护程序版本＆gt; = 5也将无法启动。

为什么在服务运行时我为ElasticSearch / Haystack拒绝连接？

1 个答案: