Elasticsearch错误卷曲:(7)无法连接到Localhost端口9200:连接拒绝但Localhost:920

Question

我正在尝试将Elasticsearch 5.5.2连接到本教程之后的Django 2项目：

运行时：终端上的curl -X GET 'http://localhost:9200'时，我得到了此错误：curl: (7) Failed to connect to localhost port 9200: Connection refused时localhost:9200在我的浏览器上运行良好。

这是我的elasticsearch.yml文件的概述：

# Use a descriptive name for your cluster:
#
#cluster.name: my-application
#
# Use a descriptive name for the node:
#
#node.name: node-1
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
#
# Path to directory where to store the data (separate multiple locations by comma):
#
#path.data: /path/to/data
#
# Path to log files:
#
#path.logs: /path/to/logs
#
# Lock the memory on startup:
#
#bootstrap.memory_lock: true
# Elasticsearch performs poorly when the system is swapping the memory.
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: 0.0.0.0
#
# Set a custom port for HTTP:
#
#http.port: 9200
#
# Pass an initial list of hosts to perform discovery when new node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
#discovery.zen.ping.unicast.hosts: ["host1", "host2"]
#
# Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):
#
#discovery.zen.minimum_master_nodes: 3
#
# For more information, consult the zen discovery module documentation.
#
# ---------------------------------- Gateway -----------------------------------
#
# Block initial recovery after a full cluster restart until N nodes are started:
#
#gateway.recover_after_nodes: 3
#
# For more information, consult the gateway module documentation.
#
# ---------------------------------- Various -----------------------------------
#
# Require explicit names when deleting indices:
#
#action.destructive_requires_name: true

/var/log/elasticsearch/是空的。

请卷曲有什么问题？

Answer 1

好的eureka！，您有一个Java堆空间错误。查看该错误：

# There is insufficient memory for the Java Runtime Environment to continue

您可以增加/减少 - 我不知道问题是否出现，因为您的机器的RAM太少，ES无法启动，或者您将RAM太少分配给ES-用于Java虚拟机中弹性的空间编辑此文件/etc/elasticsearch/jvm.options 要分配2 GB的RAM，您应该更改：

# Xms represents the initial size of total heap space
# Xmx represents the maximum size of total heap space
 -Xms2g
 -Xmx2g

然后您必须重新启动服务

sudo service elasticsearch restart

，然后用卷曲

Answer 2

在我的情况下，问题是在Java版本中，我先前安装了Open-jdk 11。在开始服务时创建问题。我更改了Open-jdk 8，它开始工作

curl localhost:9200
{
  "name" : "My First Node",
  "cluster_name" : "mycluster1",
  "version" : {
    "number" : "2.3.1",
    "build_hash" : "bd980929010aef404e7cb0843e61d0665269fc39",
    "build_timestamp" : "2016-04-04T12:25:05Z",
    "build_snapshot" : false,
    "lucene_version" : "5.5.0"
  },
  "tagline" : "You Know, for Search"
}

Answer 3

我遇到了相同的问题，但与lupanoide回答的原因不同。为他人添加我的发现。

我也在IP上拒绝了连接：9200，但Localhost：9200正在工作。当我尝试" Network.Host：0.0.0.0"时，服务将无法启动。我将值更改为" http. -host"，如下所示，这允许该服务启动并通过IP调用。

/etc/elasticsearch/elasticsearch.yml

# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
http.host: 192.168.1.199
#
# Set a custom port for HTTP:
#
http.port: 9200
#

之前：

[root@Loki-03 ~]# curl localhost:9200
    "name" : "Loki-03"
[root@Loki-03 ~]# curl 192.168.1.199:9200
curl: (7) Failed to connect to 192.168.1.199 port 9200: Connection refused

之后：

[root@Loki-03 ~]# systemctl restart elasticsearch.service 
[root@Loki-03 ~]# curl 192.168.1.199:9200
    {
      "name" : "Loki-03",

希望这会有所帮助。另外，我正在运行：

  "version" : {
    "number" : "7.4.0",
    "build_flavor" : "default",
    "build_type" : "rpm",
    "build_hash" : "22e1767283e61a198cb4db791ea66e3f11ab9910",
    "build_date" : "2019-09-27T08:36:48.569419Z",
    "build_snapshot" : false,
    "lucene_version" : "8.2.0",