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elasticsearch安装与集群配置.md

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目标

一台主节点,一台从节点

ES安装与配置

注意,集群配置完成前建议不要启动单个ES实例。 原因:默认参数启动会以单实例方式启动,创建各种文件夹、文件,可能干扰后续集群配置。

配置集群

修改配置文件

cluster.name: tipdm-es #es集群名称
node.name: es-node1    #es节点名称,每个节点的名称不能相同
node.master: true      #指定该节点是否有资格被选举成为master,默认是true
node.data: true        #指定该节点是否存储索引数据,默认为true。

network.host: 192.168.111.76  #节点的ip地址

## 下面这两个参数应该是旧版本配置参数,我安装的是7.2版本,对应参数是discovery.seed_hosts 和 cluster.initial_master_nodes 
#设置集群中master节点的初始列表,可以通过这些节点来自动发现新加入集群的节点
discovery.zen.ping.unicast.hosts: ["192.168.111.75", "192.168.111.76", "192.168.111.77"]
#设置这个参数来保证集群中的节点可以知道其它N个有master资格的节点。默认为1,对于大的集群来说,可以设置大一点的值(2-4)
discovery.zen.minimum_master_nodes: 2 

#如果要使用head,那么需要设置下面2个参数,使head插件可以访问es
http.cors.enabled: true
http.cors.allow-origin: "*"

#这是Centos6不支持SecComp,而ES默认bootstrap.system_call_filter为true进行检测,所以导致检测失败,失败后直接导致ES不能启动。
bootstrap.memory_lock: false
bootstrap.system_call_filter: false

建议新建一个linux用户,用于管理elasticsearch

useradd elasticsearch
passwd elasticsearch
chown -R elasticsearch:elasticsearch elasticsearch文件夹

此时即可启动ES

sudo su - elasticsearch
cd elasticsearch文件夹
./bin/elasticsearch

测试

浏览器中输入服务器:9200 ,显示ES参数,类似

{
  "name" : "节点名称",
  "cluster_name" : "集群名称",
  "cluster_uuid" : "YC13LOmlQna2k0okesNMxQ",
  "version" : {
    "number" : "7.2.0",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "508c38a",
    "build_date" : "2019-06-20T15:54:18.811730Z",
    "build_snapshot" : false,
    "lucene_version" : "8.0.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

说明配置成功。

将配置好的ES文件夹拷贝到其他节点,修改:

  • node.name 必须与其他节点不一样
  • network.host 与节点ip

配置head插件,图形化管理ES集群

安装head前需要先安装nodejs和npm

此处给出centos 6上yum安装方式

[root@c6-23 ~]# curl --silent --location https://rpm.nodesource.com/setup_9.x | bash -
[root@c6-23 ~]# yum install nodejs -y
[root@c6-23 ~]# node -v
v9.11.2
[root@c6-23 ~]# npm -v
5.6.0
### npm 升级
[root@c6-23 ~]# npm i -g npm
/usr/bin/npm -> /usr/lib/node_modules/npm/bin/npm-cli.js
/usr/bin/npx -> /usr/lib/node_modules/npm/bin/npx-cli.js
+ [email protected]
added 314 packages, removed 364 packages and updated 52 packages in 22.254s

其他可以参考 centos6.6 安装nodejs和npm

分别执行node -v和“npm -v,显示nodejs版本和npm版本,则说明安装成功。

安装head插件

下载head插件

wget https://github.com/mobz/elasticsearch-head/archive/master.zip

解压

unzip master.zip

安装grunt

npm install -g grunt-cli
npm install [email protected] --ignore-scripts
cd elasticsearch-head-master
npm install

执行成功后会在当前目录(elasticsearch-head-master)下生成node_modules文件夹。

修改Gruntfile.js文件:增加hostname属性,设置为*。

connect: {
    server: {
        options: {
            port: 9100,
            hostname: '*',
            base: '.',
            keepalive: true
        }
    }
}

打开_site/app.js 文件:修改head的连接地址,将this.base_uri = this.config.base_uri || this.prefs.get(“app-base_uri”) || “http://localhost:9200”;这条语句,修改为如下

this.base_uri = this.config.base_uri || this.prefs.get(“app-base_uri”) || “http://ES节点IP:9200”;

启动head插件,在elasticsearch-head-master下启动服务。在启动前要确认es集群是正常启动了的,然后才能启动head 执行命令grunt server &即可在后台启动head插件。 在浏览器访问“head部署服务器:9100”,即可看到管理界面,类似这样:

问题

elasticsearch-head 无法连接ES集群

配置问题,修改elasticsearch.yml文件,添加

http.cors.enabled: true
http.cors.allow-origin: "*"

分析原因: 可能是因为elasticsearch-head发送请求的时候,跨域了,所以变成options,让options去发现有什么可以请求的方法,而options请求没有返回结果。

主从节点配置的区别

区别一:

# 节点角色  Master
 node.master: true
 node.data: false
 node.ingest: false

# 节点角色  Data
 node.master: false
 node.data: true
 node.ingest: false

区别二: Master 设置了HTTP 相关参数,如果不设置,将无法通过HEAD能插件来访问集群

#
# ------------------------ HTTP ----------------------------
#
# 是否支持跨域访问资源
 http.cors.enabled: true
#
#
#允许访问资源的类型
 http.cors.allow-origin: "*"
#
#
# 允许HTTP请求的方法类型 
 http.cors.allow-methods: OPTIONS,HEAD,GET,POST,PUT,DELETE
#
# 允许HTTP请求头返回类型
 http.cors.allow-headers: X-Requested-With,Content-Type,Content-Length,Authorization,Content-Encoding,Accept-Encoding
#
# 支持HTTP访问API 总开关
 http.enabled: true

参见如何运行一个elasticsearch集群

failure when sending a validation request to node

启动从节点时无法加入到集群,报错信息

Caused by: java.lang.IllegalStateException: failure when sending a validation request to node
        at org.elasticsearch.cluster.coordination.Coordinator$3.onFailure(Coordinator.java:500) ~[elasticsearch-7.2.0.jar:7.2.0]
        at org.elasticsearch.cluster.coordination.JoinHelper$5.handleException(JoinHelper.java:359) ~[elasticsearch-7.2.0.jar:7.2.0]
        at org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleException(TransportService.java:1111) ~[elasticsearch-7.2.0.jar:7.2.0]
        at org.elasticsearch.transport.InboundHandler.lambda$handleException$2(InboundHandler.java:246) ~[elasticsearch-7.2.0.jar:7.2.0]
        at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:688) ~[elasticsearch-7.2.0.jar:7.2.0]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_111]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_111]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_111]
Caused by: org.elasticsearch.transport.RemoteTransportException: [node-m162p235][192.168.162.235:9300][internal:cluster/coordination/join/validate]
Caused by: org.elasticsearch.cluster.coordination.CoordinationStateRejectedException: join validation on cluster state with a different cluster uuid YC13LOmlQna2k0okesNMxQ than local cluster uuid 7eMjkdLIRjaC9XYU5GA2bg, rejecting
        at org.elasticsearch.cluster.coordination.JoinHelper.lambda$new$4(JoinHelper.java:147) ~[elasticsearch-7.2.0.jar:7.2.0]
        at org.elasticsearch.xpack.security.transport.SecurityServerTransportInterceptor$ProfileSecuredRequestHandler$1.doRun(SecurityServerTransportInterceptor.java:250) ~[?:?]
        at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.2.0.jar:7.2.0]
        at org.elasticsearch.xpack.security.transport.SecurityServerTransportInterceptor$ProfileSecuredRequestHandler.messageReceived(SecurityServerTransportInterceptor.java:308) ~[?:?]
        at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:63) ~[elasticsearch-7.2.0.jar:7.2.0]
        at org.elasticsearch.transport.InboundHandler$RequestHandler.doRun(InboundHandler.java:267) ~[elasticsearch-7.2.0.jar:7.2.0]
        at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:758) ~[elasticsearch-7.2.0.jar:7.2.0]
        at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.2.0.jar:7.2.0]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_111]

原因:推测是因为该节点之前启动过ES,已经创建了data文件夹,与要加入的集群冲突。 解决:删除data文件夹

参见该文章 ElasticSearch 开发总结—— failed to send join request to master[...] reason RemoteTransportException ElasticSearch集群节点扩容提示Failed to send join request to master

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参考资料