elasticsearch-head 无法使用 http://localhost:9200 连接到 elasticsearch答案

【问题标题】：elasticsearch-head can't connection to elasticsearch with http://localhost:9200elasticsearch-head 无法使用 http://localhost:9200 连接到 elasticsearch
【发布时间】：2017-07-03 13:41:15
【问题描述】：

elasticsearch 版本：elasticsearch-5.2.0

elasticsearch-head 版本：最新版本

启动服务成功：

#### node1 ####
deMacBook-Pro:bin yyq$ ./elasticsearch
[2017-02-15T13:08:57,174][INFO ][o.e.n.Node               ] [yml-es-node-1] initializing ...
[2017-02-15T13:08:57,303][INFO ][o.e.e.NodeEnvironment    ] [yml-es-node-1] using [1] data paths, mounts [[/ (/dev/disk1)]], net usable_space [21.4gb], net total_space [232.6gb], spins? [unknown], types [hfs]
[2017-02-15T13:08:57,304][INFO ][o.e.e.NodeEnvironment    ] [yml-es-node-1] heap size [1.9gb], compressed ordinary object pointers [true]
[2017-02-15T13:08:57,355][INFO ][o.e.n.Node               ] [yml-es-node-1] node name [yml-es-node-1], node ID [hqVAcDOdRu-LXuAgUEX9oQ]
[2017-02-15T13:08:57,358][INFO ][o.e.n.Node               ] [yml-es-node-1] version[5.2.0], pid[93922], build[24e05b9/2017-01-24T19:52:35.800Z], OS[Mac OS X/10.11.6/x86_64], JVM[Oracle Corporation/Java HotSpot(TM) 64-Bit Server VM/1.8.0_25/25.25-b02]
[2017-02-15T13:08:58,802][INFO ][o.e.p.PluginsService     ] [yml-es-node-1] loaded module [aggs-matrix-stats]
[2017-02-15T13:08:58,803][INFO ][o.e.p.PluginsService     ] [yml-es-node-1] loaded module [ingest-common]
[2017-02-15T13:08:58,803][INFO ][o.e.p.PluginsService     ] [yml-es-node-1] loaded module [lang-expression]
[2017-02-15T13:08:58,803][INFO ][o.e.p.PluginsService     ] [yml-es-node-1] loaded module [lang-groovy]
[2017-02-15T13:08:58,803][INFO ][o.e.p.PluginsService     ] [yml-es-node-1] loaded module [lang-mustache]
[2017-02-15T13:08:58,803][INFO ][o.e.p.PluginsService     ] [yml-es-node-1] loaded module [lang-painless]
[2017-02-15T13:08:58,803][INFO ][o.e.p.PluginsService     ] [yml-es-node-1] loaded module [percolator]
[2017-02-15T13:08:58,804][INFO ][o.e.p.PluginsService     ] [yml-es-node-1] loaded module [reindex]
[2017-02-15T13:08:58,804][INFO ][o.e.p.PluginsService     ] [yml-es-node-1] loaded module [transport-netty3]
[2017-02-15T13:08:58,804][INFO ][o.e.p.PluginsService     ] [yml-es-node-1] loaded module [transport-netty4]
[2017-02-15T13:08:58,805][INFO ][o.e.p.PluginsService     ] [yml-es-node-1] no plugins loaded
[2017-02-15T13:09:02,610][INFO ][o.e.n.Node               ] [yml-es-node-1] initialized
[2017-02-15T13:09:02,610][INFO ][o.e.n.Node               ] [yml-es-node-1] starting ...
[2017-02-15T13:09:02,953][INFO ][o.e.t.TransportService   ] [yml-es-node-1] publish_address {127.0.0.1:9300}, bound_addresses {[fe80::1]:9300}, {[::1]:9300}, {127.0.0.1:9300}
[2017-02-15T13:09:06,125][INFO ][o.e.c.s.ClusterService   ] [yml-es-node-1] detected_master {yml-es-node-2}{FWhiCkI7TV6hJOlmT_fgQg}{URIaxsK2T0aP7jRRe6TDfg}{127.0.0.1}{127.0.0.1:9301}, added {{yml-es-node-2}{FWhiCkI7TV6hJOlmT_fgQg}{URIaxsK2T0aP7jRRe6TDfg}{127.0.0.1}{127.0.0.1:9301},}, reason: zen-disco-receive(from master [master {yml-es-node-2}{FWhiCkI7TV6hJOlmT_fgQg}{URIaxsK2T0aP7jRRe6TDfg}{127.0.0.1}{127.0.0.1:9301} committed version [385]])
[2017-02-15T13:09:06,175][INFO ][o.e.h.HttpServer         ] [yml-es-node-1] publish_address {127.0.0.1:9200}, bound_addresses {[fe80::1]:9200}, {[::1]:9200}, {127.0.0.1:9200}
[2017-02-15T13:09:06,175][INFO ][o.e.n.Node               ] [yml-es-node-1] started

#### node2 ####
deMacBook-Pro:bin yyq$ ./elasticsearch
[2017-02-15T10:31:03,936][INFO ][o.e.n.Node               ] [yml-es-node-2] initializing ...
[2017-02-15T10:31:04,087][INFO ][o.e.e.NodeEnvironment    ] [yml-es-node-2] using [1] data paths, mounts [[/ (/dev/disk1)]], net usable_space [19.3gb], net total_space [232.6gb], spins? [unknown], types [hfs]
[2017-02-15T10:31:04,087][INFO ][o.e.e.NodeEnvironment    ] [yml-es-node-2] heap size [1.9gb], compressed ordinary object pointers [true]
[2017-02-15T10:31:04,104][INFO ][o.e.n.Node               ] [yml-es-node-2] node name [yml-es-node-2], node ID [FWhiCkI7TV6hJOlmT_fgQg]
[2017-02-15T10:31:04,112][INFO ][o.e.n.Node               ] [yml-es-node-2] version[5.2.0], pid[85158], build[24e05b9/2017-01-24T19:52:35.800Z], OS[Mac OS X/10.11.6/x86_64], JVM[Oracle Corporation/Java HotSpot(TM) 64-Bit Server VM/1.8.0_25/25.25-b02]
[2017-02-15T10:31:05,830][INFO ][o.e.p.PluginsService     ] [yml-es-node-2] loaded module [aggs-matrix-stats]
[2017-02-15T10:31:05,830][INFO ][o.e.p.PluginsService     ] [yml-es-node-2] loaded module [ingest-common]
[2017-02-15T10:31:05,830][INFO ][o.e.p.PluginsService     ] [yml-es-node-2] loaded module [lang-expression]
[2017-02-15T10:31:05,830][INFO ][o.e.p.PluginsService     ] [yml-es-node-2] loaded module [lang-groovy]
[2017-02-15T10:31:05,830][INFO ][o.e.p.PluginsService     ] [yml-es-node-2] loaded module [lang-mustache]
[2017-02-15T10:31:05,830][INFO ][o.e.p.PluginsService     ] [yml-es-node-2] loaded module [lang-painless]
[2017-02-15T10:31:05,831][INFO ][o.e.p.PluginsService     ] [yml-es-node-2] loaded module [percolator]
[2017-02-15T10:31:05,831][INFO ][o.e.p.PluginsService     ] [yml-es-node-2] loaded module [reindex]
[2017-02-15T10:31:05,831][INFO ][o.e.p.PluginsService     ] [yml-es-node-2] loaded module [transport-netty3]
[2017-02-15T10:31:05,831][INFO ][o.e.p.PluginsService     ] [yml-es-node-2] loaded module [transport-netty4]
[2017-02-15T10:31:05,832][INFO ][o.e.p.PluginsService     ] [yml-es-node-2] no plugins loaded
[2017-02-15T10:31:09,871][INFO ][o.e.n.Node               ] [yml-es-node-2] initialized
[2017-02-15T10:31:09,871][INFO ][o.e.n.Node               ] [yml-es-node-2] starting ...
[2017-02-15T10:31:10,171][INFO ][o.e.t.TransportService   ] [yml-es-node-2] publish_address {127.0.0.1:9301}, bound_addresses {[fe80::1]:9301}, {[::1]:9301}, {127.0.0.1:9301}
[2017-02-15T10:31:13,327][INFO ][o.e.c.s.ClusterService   ] [yml-es-node-2] detected_master {yml-es-node-1}{hqVAcDOdRu-LXuAgUEX9oQ}{VrY6MUvhQNetUmbzcRnKMg}{127.0.0.1}{127.0.0.1:9300}, added {{yml-es-node-1}{hqVAcDOdRu-LXuAgUEX9oQ}{VrY6MUvhQNetUmbzcRnKMg}{127.0.0.1}{127.0.0.1:9300},}, reason: zen-disco-receive(from master [master {yml-es-node-1}{hqVAcDOdRu-LXuAgUEX9oQ}{VrY6MUvhQNetUmbzcRnKMg}{127.0.0.1}{127.0.0.1:9300} committed version [223]])
[2017-02-15T10:31:13,388][INFO ][o.e.h.HttpServer         ] [yml-es-node-2] publish_address {127.0.0.1:9201}, bound_addresses {[fe80::1]:9201}, {[::1]:9201}, {127.0.0.1:9201}
[2017-02-15T10:31:13,388][INFO ][o.e.n.Node               ] [yml-es-node-2] started

deMacBook-Pro:elasticsearch-head-master yyq$ grunt server
Running "connect:server" (connect) task
Waiting forever...
Started connect web server on http://localhost:9100

当我打开url：http://localhost:9100并点击[连接]按钮时，我无法连接到elasticsearch。有人可以帮我吗？这是screenshot

【问题讨论】：

标签： elasticsearch elastic-stack elasticsearch-head

【解决方案1】：

在您的elasticsearch.yml 配置中，您可能有以下设置：

http.port: 9201

这在您的日志中也可见：

[...] publish_address {127.0.0.1:9201}, bound_addresses {[fe80::1]:9201}, {[::1]:9201}, {127.0.0.1:9201}
                                  ^
                                  |
                            your HTTP port

所以在您的elasticsearch-head 接口中，您需要连接到localhost:9201 而不是localhost:9200。

更新

您还需要在您的elasticsearch.yml 配置中添加http.cors.enabled: true 并重新启动您的ES 服务器

【讨论】：

在我的电脑里，有两个实例，[yml-es-node-1]的端口是9200，[yml-es-node-2]的端口是9201。我改的时候到localhost:9201，也连接不上。
yml-es-node-1 运行了吗？
如果您打开浏览器的开发者控制台，您会在“网络”窗格中看到什么？
XMLHttpRequest 无法加载 localhost:9200/_cluster/health。 Access-Control-Allow-Origin 不允许来源localhost:9100。
那么你需要在你的elasticsearch.yml配置中添加http.cors.enabled: true并重启你的ES服务器

【解决方案2】：

如前文所述，为了能够运行 head 插件检查 ElastiSearch 集群的健康状态，您需要启用 CORS 的环境变量。一种方法是按照here 的描述安装 ES 的配置文件。或者，您可以直接在 docker-compose 中定义环境变量，如this GitHub 问题中所述。为了完整起见，我添加了下面的代码，这对我有用：

version: '3'
services:
    # search engine
    elasticsearch:
        image: docker.elastic.co/elasticsearch/elasticsearch-oss:7.0.1
        container_name: elasticsearch
        environment:
            - discovery.type=single-node
            - http.port=9200
            - http.cors.enabled=true
            - http.cors.allow-origin=http://localhost:1358,http://127.0.0.1:1358
            - http.cors.allow-headers=X-Requested-With,X-Auth-Token,Content-Type,Content-Length,Authorization
            - http.cors.allow-credentials=true
            - bootstrap.memory_lock=true
            - 'ES_JAVA_OPTS=-Xms512m -Xmx512m'
        ports:
            - '9200:9200'
            - '9300:9300'
    # elasticsearch browser
    dejavu:
        image: appbaseio/dejavu:3.2.3
        container_name: dejavu
        ports:
            - '1358:1358'
        links:
            - elasticsearch

请注意，使用 - http.cors.allow-origin=* 可以工作，并且对于某些开发设置可能很方便。

【讨论】：