Elasticsearch Cluster 安装与配置 

2017-08-15 景峯 Netkiller

本文节选自《Netkiller Database 手札》作者：netkiller 网站: http://www.netkiller.cn

23.1.2. Elasticsearch Cluster

集群模式需要两个以上的节点，通常是一个 master 节点，多个 data 节点

首先在所有节点上安装 elasticsearch，然后配置各节点的配置文件，对于 5.5.1 不需要配置决定哪些节点属于 master 节点 或者 data 节点。

curl -s https://raw.githubusercontent.com/oscm/shell/master/search/elasticsearch/elasticsearch-5.x.sh | bash

配置文件

cluster.name: elasticsearch-cluster # 配置集群名称,所有服务器服务器保持一致  node.name: node-1 # 每个节点唯一标识，每个节点只需改动这里，一次递增 node-1, node-2, node-3 ...  network.host: 0.0.0.0  discovery.zen.ping.unicast.hosts: ["172.16.0.20", "172.16.0.21","172.16.0.22"]  # 所有节点的IP 地址写在这里  discovery.zen.minimum_master_nodes: 3 # 可以作为master的节点总数，有多少个节点就写多少  http.cors.enabled: true http.cors.allow-origin: "*"

查看节点状态，使用curl工具: curl 'http://localhost:9200/_nodes/process?pretty'

root@netkiller /var/log/elasticsearch % curl 'http://localhost:9200/_nodes/process?pretty' {   "_nodes" : {     "total" : 2,     "successful" : 2,     "failed" : 0   },   "cluster_name" : "my-application",   "nodes" : {     "-lnKCmBXRpiwExLns0jc9g" : {       "name" : "node-1",       "transport_address" : "10.104.3.2:9300",       "host" : "10.104.3.2",       "ip" : "10.104.3.2",       "version" : "5.5.1",       "build_hash" : "19c13d0",       "roles" : [         "master",         "data",         "ingest"       ],       "process" : {         "refresh_interval_in_millis" : 1000,         "id" : 23669,         "mlockall" : false       }     },     "WVsgYi2HT8GWnZU1kUwFwA" : {       "name" : "node-2",       "transport_address" : "10.186.7.221:9300",       "host" : "10.186.7.221",       "ip" : "10.186.7.221",       "version" : "5.5.1",       "build_hash" : "19c13d0",       "roles" : [         "master",         "data",         "ingest"       ],       "process" : {         "refresh_interval_in_millis" : 1000,         "id" : 12641,         "mlockall" : false       }     }   } }

启动节点后回生成 cluster.name 为文件名的日志文件。

谁先启动谁讲成为master

[2017-08-11T17:42:46,018][INFO ][o.e.c.s.ClusterService   ] [node-1] new_master {node-1}{-lnKCmBXRpiwExLns0jc9g}{rZcJDIynSzq2Td3yP2kN5A}{10.104.3.2}{10.104.3.2:9300}, added {{node-2}{WVsgYi2HT8GWnZU1kUwFwA}{X13ShUpAQa2zA1Mgcsm3bQ}{10.186.7.221}{10.186.7.221:9300},}, reason: zen-disco-elected-as-master ([1] nodes joined)[{node-2}{WVsgYi2HT8GWnZU1kUwFwA}{X13ShUpAQa2zA1Mgcsm3bQ}{10.186.7.221}{10.186.7.221:9300}]

如果master出现故障，其他节点会接管

[2017-08-11T17:44:52,797][INFO ][o.e.c.s.ClusterService   ] [node-2] master {new {node-2}{WVsgYi2HT8GWnZU1kUwFwA}{vl8kQx8sQdGVVohrNQnZOQ}{10.186.7.221}{10.186.7.221:9300}}, removed {{node-1}{-lnKCmBXRpiwExLns0jc9g}{rZcJDIynSzq2Td3yP2kN5A}{10.104.3.2}{10.104.3.2:9300},}, added {{node-1}{-lnKCmBXRpiwExLns0jc9g}{odnoG9kpQpeX1ltx5KYTSw}{10.104.3.2}{10.104.3.2:9300},}, reason: zen-disco-elected-as-master ([1] nodes joined)[{node-1}{-lnKCmBXRpiwExLns0jc9g}{odnoG9kpQpeX1ltx5KYTSw}{10.104.3.2}{10.104.3.2:9300}] [2017-08-11T17:44:53,184][INFO ][o.e.c.r.DelayedAllocationService] [node-2] scheduling reroute for delayed shards in [59.5s] (11 delayed shards) [2017-08-11T17:44:53,929][INFO ][o.e.c.r.a.AllocationService] [node-2] Cluster health status changed from [RED] to [YELLOW] (reason: [shards started [[information][0]] ...]).

master 节点恢复上线会提示

[2017-08-11T17:44:52,855][INFO ][o.e.c.s.ClusterService   ] [node-1] detected_master {node-2}{WVsgYi2HT8GWnZU1kUwFwA}{vl8kQx8sQdGVVohrNQnZOQ}{10.186.7.221}{10.186.7.221:9300}, added {{node-2}{WVsgYi2HT8GWnZU1kUwFwA}{vl8kQx8sQdGVVohrNQnZOQ}{10.186.7.221}{10.186.7.221:9300},}, reason: zen-disco-receive(from master [master {node-2}{WVsgYi2HT8GWnZU1kUwFwA}{vl8kQx8sQdGVVohrNQnZOQ}{10.186.7.221}{10.186.7.221:9300} committed version [44]])

23.1.3. 负载均衡配置

因为 elasticsearch 没有用户认证机制我们通常在内网访问他。如果对外提供服务需要增加用户认证。

$ printf "john:$(openssl passwd -crypt s3cr3t)n" > /etc/nginx/passwords

创建 nginx 配置文件 /etc/nginx/conf.d/elasticsearch.conf

upstream elasticsearch { 	server 172.16.0.10:9200; 	server 172.16.0.20:9200; 	server 172.16.0.30:9200;  	keepalive 15; }  server { 	listen 9200; 	auth_basic "Protected Elasticsearch"; 	auth_basic_user_file passwords;  	location ~* ^(/_cluster|/_nodes) { 		return 403; 		break; 	}   	location / {      		if ($request_filename ~ _shutdown) { 		    return 403; 		    break; 		}  		proxy_pass http://elasticsearch; 		proxy_http_version 1.1; 		proxy_set_header Connection "Keep-Alive"; 		proxy_set_header Proxy-Connection "Keep-Alive"; 	}  }

反复使用下面方法请求，最终你会发现 total_opened 会达到你的nginx 配置数量

$ curl 'http://test:test@localhost:9200/_nodes/stats/http?pretty' | grep total_opened # "total_opened" : 15

23.2.1. elasticsearch-analysis-ik

安装插件

root@netkiller ~ % /usr/share/elasticsearch/bin/elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v5.5.1/elasticsearch-analysis-ik-5.5.1.zip -> Downloading https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v5.5.1/elasticsearch-analysis-ik-5.5.1.zip [=================================================] 100%    -> Installed analysis-ik

curl -XPOST http://localhost:9200/index/fulltext/_mapping -d' {         "properties": {             "content": {                 "type": "text",                 "analyzer": "ik_max_word",                 "search_analyzer": "ik_max_word"             }         }      }'

23.3. 节点管理

23.3.1. 查看索引

root@netkiller ~ % curl 'http://localhost:9200/_cat/indices?v'          health status index        uuid                   pri rep docs.count docs.deleted store.size pri.store.size yellow open   information  oygxIi-dR1eB9NoIZtJrxQ   5   1         45           42      731kb          731kb green  open   .kibana      9jBBaOomTO2EakZlZqnE-g   1   1          5            1     62.5kb         31.2kb green  open   logstash-api WHXZhn3vRWiuVbhR8rGoEg   5   1        565            0      3.8mb          1.9mb

23.3.2. 节点健康状态

root@netkiller ~ % curl 'http://localhost:9200/_cat/health?v'  epoch      timestamp cluster        status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent 1502445967 18:06:07  my-application yellow          2         2     17  11    0    0        5             0                  -                 77.3%

root@netkiller ~ % curl 'http://localhost:9200/_cluster/health'   {"cluster_name":"my-application","status":"yellow","timed_out":false,"number_of_nodes":2,"number_of_data_nodes":2,"active_primary_shards":11,"active_shards":17,"relocating_shards":0,"initializing_shards":0,"unassigned_shards":5,"delayed_unassigned_shards":0,"number_of_pending_tasks":0,"number_of_in_flight_fetch":0,"task_max_waiting_in_queue_millis":0,"active_shards_percent_as_number":77.27272727272727}

23.3.3. 节点http状态

root@VM_3_2_centos ~ % curl 'localhost:9200/_nodes/stats/http?pretty' {   "_nodes" : {     "total" : 2,     "successful" : 2,     "failed" : 0   },   "cluster_name" : "my-application",   "nodes" : {     "-lnKCmBXRpiwExLns0jc9g" : {       "timestamp" : 1502446878773,       "name" : "node-1",       "transport_address" : "10.104.3.2:9300",       "host" : "10.104.3.2",       "ip" : "10.104.3.2:9300",       "roles" : [         "master",         "data",         "ingest"       ],       "http" : {         "current_open" : 4,         "total_opened" : 29       }     },     "WVsgYi2HT8GWnZU1kUwFwA" : {       "timestamp" : 1502446878782,       "name" : "node-2",       "transport_address" : "10.186.7.221:9300",       "host" : "10.186.7.221",       "ip" : "10.186.7.221:9300",       "roles" : [         "master",         "data",         "ingest"       ],       "http" : {         "current_open" : 0,         "total_opened" : 2       }     }   } }