Elasticsearch 负载均衡集群

Elasticsearch 负载均衡集群


前言:
master node #维护集群状态和配置集群,负载应尽量小
data node #处理数据(CRUD, search, and aggregations)
client node #负载均衡器(route requests, handle the search reduce phase, and distribute bulk indexing)
tribe node #特殊的client node, 可以在客户端和多个集群间交叉作业


环境:
CentOS7.1 x64
elasticsearch-2.3.2

说明:小集群或本地测试可以不用区分master node,data node,client node。
但生产环境为了保证最大的可伸缩性，官方建议不同的类型节点加以区分，默认情况的elasticsearch既是master node,也是data node。

官方推荐至少3节点以避免脑裂
By default, each index in Elasticsearch is allocated 5 primary shards and 1 replica which means that if you have at least two nodes in your cluster, your index will have 5 primary shards and another 5 replica shards (1 complete replica) for a total of 10 shards per index.

本实验采用不同类型的节点集群(client x1, master x3, data x2)
ela-client.example.com:192.168.8.10(client node)
ela-master1.example.com:192.168.8.101(master node)
ela-master2.example.com:192.168.8.102(master node)
ela-master3.example.com:192.168.8.103(master node)
ela-data1.example.com:192.168.8.201(data node)
ela-data2.example.com:192.168.8.202(data node)


一.安装(略)
在所有节点上安装相同版本的elasticsearch 


二.系统资源配置(所有节点)
1.调整内核参数
swapoff -a #同时修改/etc/fstab

cat >>/usr/lib/sysctl.d/00-system.conf <<HERE


vm.swappiness = 1

vm.max_map_count = 262144

HERE

sysctl -p /usr/lib/sysctl.d/00-system.conf

2.调整资源限制

https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-configuration.html


JMX内存大小

cat >>/etc/profile <<HERE

export ES_MIN_MEM=1g

export ES_MAX_MEM=1g

HERE

source /etc/profile

或直接修改环境变更定义脚本/opt/elasticsearch-2.3.2/bin/elasticsearch.in.sh


文件描述符数量及memlock

cat >>/etc/security/limits.conf <<HERE

elasticsearch soft nofile 65536

elasticsearch hard nofile 65536

elasticsearch soft memlock unlimited

elasticsearch hard memlock unlimited

HERE


 

三.elasticsearch配置(config/elasticsearch.yml)

创建集群名为elasticsearch_cluster的集群(默认的集群名为elasticsearch)
1.client node
ela-client.example.com:192.168.8.10(client node)

mv /opt/elasticsearch-2.3.2/config/elasticsearch.yml{,.default}

cat >/opt/elasticsearch-2.3.2/config/elasticsearch.yml <<HERE

cluster.name: elasticsearch_cluster

node.name: ${HOSTNAME}

node.master: false

node.data: false

path.data: /opt/elasticsearch-2.3.2/data

path.logs: /opt/elasticsearch-2.3.2/logs

bootstrap.mlockall: true

network.host: 127.0.0.1,192.168.8.10

http.port: 9200

index.refresh_interval: 5s

script.inline: true

script.indexed: true

HERE


2.master node
ela-master1.example.com:192.168.8.101(master node)

mv /opt/elasticsearch-2.3.2/config/elasticsearch.yml{,.default}

cat >/opt/elasticsearch-2.3.2/config/elasticsearch.yml <<HERE

cluster.name: elasticsearch_cluster

node.name: ${HOSTNAME}

node.master: true

node.data: false

path.data: /opt/elasticsearch-2.3.2/data

path.logs: /opt/elasticsearch-2.3.2/logs

bootstrap.mlockall: true

network.host: 127.0.0.1,192.168.8.101

http.port: 9200

index.refresh_interval: 5s

script.inline: true

script.indexed: true

HERE
ela-master2.example.com:192.168.8.102(master node)

mv /opt/elasticsearch-2.3.2/config/elasticsearch.yml{,.default}

cat >/opt/elasticsearch-2.3.2/config/elasticsearch.yml <<HERE

cluster.name: elasticsearch_cluster

node.name: ${HOSTNAME}

node.master: true

node.data: false

path.data: /opt/elasticsearch-2.3.2/data

path.logs: /opt/elasticsearch-2.3.2/logs

bootstrap.mlockall: true

network.host: 127.0.0.1,192.168.8.102

http.port: 9200

index.refresh_interval: 5s

script.inline: true

script.indexed: true

HERE
ela-master3.example.com:192.168.8.103(master node)

mv /opt/elasticsearch-2.3.2/config/elasticsearch.yml{,.default}

cat >/opt/elasticsearch-2.3.2/config/elasticsearch.yml <<HERE

cluster.name: elasticsearch_cluster

node.name: ${HOSTNAME}

node.master: true

node.data: false

path.data: /opt/elasticsearch-2.3.2/data

path.logs: /opt/elasticsearch-2.3.2/logs

bootstrap.mlockall: true

network.host: 127.0.0.1,192.168.8.103

http.port: 9200

index.refresh_interval: 5s

script.inline: true

script.indexed: true

HERE

3.data node
ela-data1.example.com:192.168.8.201(data node)

mv /opt/elasticsearch-2.3.2/config/elasticsearch.yml{,.default}

cat >/opt/elasticsearch-2.3.2/config/elasticsearch.yml <<HERE

cluster.name: elasticsearch_cluster

node.name: ${HOSTNAME}

node.master: false

node.data: true

path.data: /opt/elasticsearch-2.3.2/data

path.logs: /opt/elasticsearch-2.3.2/logs

bootstrap.mlockall: true

network.host: 127.0.0.1,192.168.8.201

http.port: 9200

index.refresh_interval: 5s

script.inline: true

script.indexed: true

HERE
ela-data2.example.com:192.168.8.202(data node)

mv /opt/elasticsearch-2.3.2/config/elasticsearch.yml{,.default}

cat >/opt/elasticsearch-2.3.2/config/elasticsearch.yml <<HERE

cluster.name: elasticsearch_cluster

node.name: ${HOSTNAME}

node.master: false

node.data: true

path.data: /opt/elasticsearch-2.3.2/data

path.logs: /opt/elasticsearch-2.3.2/logs

bootstrap.mlockall: true

network.host: 127.0.0.1,192.168.8.202

http.port: 9200

index.refresh_interval: 5s

script.inline: true

script.indexed: true

HERE

提示: 配置文件还可以如下格式
cluster:
    name: elasticsearch_cluster
node:
    name: ${HOSTNAME}

node:

    master: true

node:

    data: false

path:

    data: /opt/elasticsearch-2.3.2/data

path:

    logs: /opt/elasticsearch-2.3.2/logs

bootstrap:

    mlockall: true

network:

    host: 192.168.8.101

http:

    port: 9200

index:
    refresh_interval: 5s
敏感关键词可以通过指定${prompt.text} or ${prompt.secret}等，在elasticsearch启动时手动输入
如node.name: ${prompt.text}


四.启动Elasticsearch节点

su - elasticsearch -c "/opt/elasticsearch-2.3.2/bin/elasticsearch -d -p /tmp/elasticsearch.pid"

停止
kill $(cat /tmp/elasticsearch.pid)

还可以通过命令行传参
su - elasticsearch -c "/opt/elasticsearch-2.3.2/bin/elasticsearch -Des.cluster.name=elasticsearch_cluster -Des.node.name=elastic1.example.com -Des.path.data=/opt/elasticsearch-2.3.2/data -Des.path.logs=/opt/elasticsearch-2.3.2/logs -Des.bootstrap.mlockall=true -Des.network.host="127.0.0.1,192.168.8.101" -Des.http.port=9200 -Des.index.refresh_interval=5s"
或
su - elasticsearch -c "/opt/elasticsearch-2.3.2/bin/elasticsearch 

--cluster.name elasticsearch_cluster --node.name elastic1.example.com --path.data /opt/elasticsearch-2.3.2/data --path.logs /opt/elasticsearch-2.3.2/logs --bootstrap.mlockall true --network.host "127.0.0.1,192.168.8.101" --http.port 9200 --index.refresh_interval 5s"


集群模式下默认监听在9300端口

[root@ela-master1 ~]# netstat -tunlp|grep java

tcp        0      0 192.168.8.101:9200      0.0.0.0:*               LISTEN      2739/java           

tcp        0      0 127.0.0.1:9200          0.0.0.0:*               LISTEN      2739/java           

tcp        0      0 192.168.8.101:9300      0.0.0.0:*               LISTEN      2739/java           

tcp        0      0 127.0.0.1:9300          0.0.0.0:*               LISTEN      2739/java 


[root@ela-master1 ~]# curl 'http://localhost:9200/_nodes/process?pretty'

{

  "cluster_name" : "elasticsearch_cluster",

  "nodes" : {

    "hT7NA2G9S72TW3G_Xhip8A" : {

      "name" : "ela-master1.example.com",

      "transport_address" : "192.168.8.101:9300",

      "host" : "192.168.8.101",

      "ip" : "192.168.8.101",

      "version" : "2.3.2",

      "build" : "b9e4a6a",

      "http_address" : "192.168.8.101:9200",

      "attributes" : {

        "data" : "false",

        "master" : "true"

      },

      "process" : {

        "refresh_interval_in_millis" : 1000,

        "id" : 2739,

        "mlockall" : true

      }

    }

  }

}

[root@ela-master1 ~]# curl 'http://localhost:9200/_nodes/stats/process?pretty'

{

  "cluster_name" : "elasticsearch_cluster",

  "nodes" : {

    "hT7NA2G9S72TW3G_Xhip8A" : {

      "timestamp" : 1462608578095,

      "name" : "ela-master1.example.com",

      "transport_address" : "192.168.8.101:9300",

      "host" : "192.168.8.101",

      "ip" : [ "192.168.8.101:9300", "NONE" ],

      "attributes" : {

        "data" : "false",

        "master" : "true"

      },

      "process" : {

        "timestamp" : 1462608578095,

        "open_file_descriptors" : 113,

        "max_file_descriptors" : 65536,

        "cpu" : {

          "percent" : 0,

          "total_in_millis" : 14120

        },

        "mem" : {

          "total_virtual_in_bytes" : 3714117632

        }

      }

    }

  }

}

提示:JMX调大后，如果进程被OOM，请检查虚机内存大小，本人测试是使用的512MB内存的主机，JMX最小最大都设置的1GB，结果一启动就OOM，后来增加内存后就正常了，更多的报错请查看日志/opt/elasticsearch-2.3.2/logs/elasticsearch_cluster.log


启动其它节点(略)




五.创建集群(unicast模式)

 

提示:multicast组播模式需要安装插件

/opt/elasticsearch-2.3.2/bin/plugin install discovery-multicast


通过discovery模块来将节点加入集群

在以上节点的配置文件/opt/elasticsearch-2.3.2/config/elasticsearch.yml中加入如下行后重启

cat >>/opt/elasticsearch-2.3.2/config/elasticsearch.yml <<HERE

discovery.zen.ping.timeout: 100s

discovery.zen.fd.ping_timeout: 100s

discovery.zen.ping.multicast.enabled: false

discovery.zen.ping.unicast.hosts: ["192.168.8.10:9300","192.168.8.101:9300", "192.168.8.102:9300", "192.168.8.103:9300", "192.168.8.201:9300", "192.168.8.202:9300"]

discovery.zen.minimum_master_nodes: 2

gateway.recover_after_nodes: 2

HERE


This setting should be set to a quorum of master-eligible nodes:


(master_eligible_nodes / 2) + 1

In other words, if there are three master-eligible nodes, then minimum master nodes should be set to (3 / 2) + 1 or 2:


discovery.zen.minimum_master_nodes: 2

Defaults to 1.

This setting can also be changed dynamically on a live cluster with the cluster update settings API:


PUT _cluster/settings
{
  "transient": {
    "discovery.zen.minimum_master_nodes": 2
  }
}
Tip

An advantage of splitting the master and data roles between dedicated nodes is that you can have just three master-eligible nodes and set minimum_master_nodes to 2. You never have to change this setting, no matter how many dedicated data nodes you add to the cluster.

节点全部启动完成后，在任意节点上都可以查看集群状态

[root@ela-master3 ~]# curl 'http://localhost:9200/_nodes/process?pretty'

{

  "cluster_name" : "elasticsearch_cluster",

  "nodes" : {

    "RImoGoyDQue5PxKjjuGXJA" : {

      "name" : "ela-master2.example.com",

      "transport_address" : "192.168.8.102:9300",

      "host" : "192.168.8.102",

      "ip" : "192.168.8.102",

      "version" : "2.3.2",

      "build" : "b9e4a6a",

      "http_address" : "192.168.8.102:9200",

      "attributes" : {

        "data" : "false",

        "master" : "true"

      },

      "process" : {

        "refresh_interval_in_millis" : 1000,

        "id" : 2103,

        "mlockall" : true

      }

    },

    "h_jajHU_Rea7EUjKtQUnDA" : {

      "name" : "ela-master3.example.com",

      "transport_address" : "192.168.8.103:9300",

      "host" : "192.168.8.103",

      "ip" : "192.168.8.103",

      "version" : "2.3.2",

      "build" : "b9e4a6a",

      "http_address" : "192.168.8.103:9200",

      "attributes" : {

        "data" : "false",

        "master" : "true"

      },

      "process" : {

        "refresh_interval_in_millis" : 1000,

        "id" : 1073,

        "mlockall" : true

      }

    },

    "dAp0lnpVTPavfTuiabM-hg" : {

      "name" : "ela-data1.example.com",

      "transport_address" : "192.168.8.201:9300",

      "host" : "192.168.8.201",

      "ip" : "192.168.8.201",

      "version" : "2.3.2",

      "build" : "b9e4a6a", 

      "http_address" : "192.168.8.201:9200",

      "attributes" : {

        "master" : "false"

      },

      "process" : {

        "refresh_interval_in_millis" : 1000,

        "id" : 984,

        "mlockall" : true

      }

    },

    "TMN4Rr72TTaWpPdve8H5dQ" : {

      "name" : "localhost.localdomain",

      "transport_address" : "192.168.8.202:9300",

      "host" : "192.168.8.202",

      "ip" : "192.168.8.202",

      "version" : "2.3.2",

      "build" : "b9e4a6a",

      "http_address" : "192.168.8.202:9200",

      "attributes" : {

        "master" : "false"

      },

      "process" : { 

        "refresh_interval_in_millis" : 1000,

        "id" : 1020,

        "mlockall" : true

      }

    },

    "gi3kX3IXTJiC0PdUf0KH1A" : {

      "name" : "ela-master1.example.com",

      "transport_address" : "192.168.8.101:9300",

      "host" : "192.168.8.101",

      "ip" : "192.168.8.101",

      "version" : "2.3.2",

      "build" : "b9e4a6a",

      "http_address" : "192.168.8.101:9200",

      "attributes" : { 

        "data" : "false",

        "master" : "true"

      },

      "process" : {

        "refresh_interval_in_millis" : 1000,

        "id" : 1139,

        "mlockall" : true

      }

    },

    "PMmbEGuoTyCR54FbGt5bpg" : {

      "name" : "ela-client.example.com",

      "transport_address" : "192.168.8.10:9300",

      "host" : "192.168.8.10",

      "ip" : "192.168.8.10",

      "version" : "2.3.2",

      "build" : "b9e4a6a",

      "http_address" : "192.168.8.10:9200",

      "attributes" : {

        "data" : "false",

        "master" : "false"

      },

      "process" : {

        "refresh_interval_in_millis" : 1000,

        "id" : 986,

        "mlockall" : true

      }

    }

  }

}

  

日志中也有类似信息

tail -f /opt/elasticsearch-2.3.2/logs/elasticsearch_cluster.log

detected_master {ela-master2.example.com}{RImoGoyDQue5PxKjjuGXJA}{192.168.8.102}{192.168.8.102:9300}{data=false, master=true},

added {{ela-master2.example.com}{RImoGoyDQue5PxKjjuGXJA}{192.168.8.102}{192.168.8.102:9300}{data=false, master=true},

{ela-master3.example.com}{h_jajHU_Rea7EUjKtQUnDA}{192.168.8.103}{192.168.8.103:9300}{data=false, master=true},},

reason: zen-disco-receive(from master [{ela-master2.example.com}{RImoGoyDQue5PxKjjuGXJA}{192.168.8.102}{192.168.8.102:9300}{data=false, master=true}])

[2016-05-07 17:08:57,679][INFO ][cluster.service          ] [ela-master1.example.com] 

added {{ela-client.example.com}{PMmbEGuoTyCR54FbGt5bpg}{192.168.8.10}{192.168.8.10:9300}{data=false, master=false},},

reason: zen-disco-receive(from master [{ela-master2.example.com}{RImoGoyDQue5PxKjjuGXJA}{192.168.8.102}{192.168.8.102:9300}{data=false, master=true}])

[2016-05-07 17:10:14,944][INFO ][cluster.service          ] [ela-master1.example.com] 

added {{ela-data1.example.com}{dAp0lnpVTPavfTuiabM-hg}{192.168.8.201}{192.168.8.201:9300}{master=false},}, 

reason: zen-disco-receive(from master [{ela-master2.example.com}{RImoGoyDQue5PxKjjuGXJA}{192.168.8.102}{192.168.8.102:9300}{data=false, master=true}])

[2016-05-07 17:11:14,109][INFO ][cluster.service          ] [ela-master1.example.com] 

added {{ela-data2.example.com}{TMN4Rr72TTaWpPdve8H5dQ}{192.168.8.202}{192.168.8.202:9300}{master=false},}, 

reason: zen-disco-receive(from master [{ela-master2.example.com}{RImoGoyDQue5PxKjjuGXJA}{192.168.8.102}{192.168.8.102:9300}{data=false, master=true}])


六.导入示例数据

[root@ela-client ~]# curl 'localhost:9200/_cat/indices?v'

health status index               pri rep docs.count docs.deleted store.size pri.store.size 

green  open   shakespeare           5   1     111396            0     36.5mb         18.2mb 

green  open   logstash-2015.05.20   5   1       4750            0     72.9mb         35.9mb 

green  open   bank                  5   1       1000            0    890.5kb        442.6kb 

green  open   .kibana               1   1          4            0     47.9kb         25.2kb 

green  open   logstash-2015.05.18   5   1       4631            0     64.9mb         34.7mb 

green  open   logstash-2015.05.19   5   1       4624            0     66.7mb         35.3mb 


[root@ela-client ~]# 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 

1462623617 20:20:17  elasticsearch_cluster green             6         2     52  26    0    0       32             0                  -                 100% 


提示:通过client node导入可以实现数据分片负载，Kibana中可以指定client node类型的Elasticsearch节点来实现负载均衡，如
elasticsearch.url: "http://192.168.8.10:9200"


补充: 3“平型”节点集群
elastic1.example.com:192.168.8.101(master & data node)
elastic1.example.com:192.168.8.102(master & data node)
elastic1.example.com:192.168.8.103(master & data node)

保持默认节点类型(node.master:true,node.data:true)
elastic1.example.com:192.168.8.101

mv /opt/elasticsearch-2.3.2/config/elasticsearch.yml{,.default}

cat >/opt/elasticsearch-2.3.2/config/elasticsearch.yml <<HERE

cluster.name: elasticsearch_cluster

node.name: ${HOSTNAME}

path.data: /opt/elasticsearch-2.3.2/data

path.logs: /opt/elasticsearch-2.3.2/logs

bootstrap.mlockall: true

network.host: 127.0.0.1,192.168.8.101

http.port: 9200

index.refresh_interval: 5s

script.inline: true

script.indexed: true

HERE
elastic2.example.com:192.168.8.102

mv /opt/elasticsearch-2.3.2/config/elasticsearch.yml{,.default}

cat >/opt/elasticsearch-2.3.2/config/elasticsearch.yml <<HERE

cluster.name: elasticsearch_cluster

node.name: ${HOSTNAME}

path.data: /opt/elasticsearch-2.3.2/data

path.logs: /opt/elasticsearch-2.3.2/logs

bootstrap.mlockall: true

network.host: 127.0.0.1,192.168.8.102

http.port: 9200

index.refresh_interval: 5s

script.inline: true

script.indexed: true

HERE
elastic3.example.com:192.168.8.103

mv /opt/elasticsearch-2.3.2/config/elasticsearch.yml{,.default}

cat >/opt/elasticsearch-2.3.2/config/elasticsearch.yml <<HERE

cluster.name: elasticsearch_cluster

node.name: ${HOSTNAME}

path.data: /opt/elasticsearch-2.3.2/data

path.logs: /opt/elasticsearch-2.3.2/logs

bootstrap.mlockall: true

network.host: 127.0.0.1,192.168.8.103

http.port: 9200

index.refresh_interval: 5s

script.inline: true

script.indexed: true

HERE
启动后因节点与节点之间没有通信，各自为政，启动后可能出现如下状态

[root@elastic1 ~]# curl 'http://192.168.8.101:9200/_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 

1462205047 00:04:07  elasticsearch_cluster green          1         1      0   0    0    0        0             0                  -                100.0% 

[root@elastic1 ~]# curl 'http://192.168.8.102:9200/_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 

1462205053 00:04:13  elasticsearch_cluster green           1         1      0   0    0    0        0             0                  -                100.0% 

[root@elastic1 ~]# curl 'http://192.168.8.103:9200/_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 

1462205057 00:04:17  elasticsearch_cluster green           1         1      0   0    0    0        0             0                  -                100.0% 


在以上节点的配置文件/opt/elasticsearch-2.3.2/config/elasticsearch.yml中加入如下行后重启

cat >>/opt/elasticsearch-2.3.2/config/elasticsearch.yml <<HERE

discovery.zen.ping.timeout: 100s

discovery.zen.fd.ping_timeout: 100s

discovery.zen.ping.multicast.enabled: false

discovery.zen.ping.unicast.hosts: ["192.168.8.101:9300", "192.168.8.102:9300", "192.168.8.103:9300"]

discovery.zen.minimum_master_nodes: 2 

gateway.recover_after_nodes: 2

HERE

192.168.8.103重启后日志的一段，可以看到192.168.8.101被当作了master

[2016-05-03 00:29:47,837][INFO ][env            ] [elastic3.example.com] heap size [990.7mb], compressed ordinary object pointers [true]

[2016-05-03 00:29:49,165][INFO ][node           ] [elastic3.example.com] initialized

[2016-05-03 00:29:49,165][INFO ][node           ] [elastic3.example.com] starting ...

[2016-05-03 00:29:49,231][INFO ][transport      ] [elastic3.example.com] publish_address {192.168.8.103:9300}, bound_addresses {192.168.8.103:9300}

[2016-05-03 00:29:49,236][INFO ][discovery      ] [elastic3.example.com] elasticsearch_cluster/eTXMSH77SLynRTNtKKXaHA

[2016-05-03 00:29:52,357][INFO ][cluster.service] [elastic3.example.com] detected_master {elastic1.example.com}{VbXED9YbQ7qQGcSZ0TlKPQ}{192.168.8.101}{192.168.8.101:9300}, 

added {{elastic2.example.com}{v_yQRvrYT9GHumJ7kIzpUQ}{192.168.8.102}{192.168.8.102:9300},{elastic1.example.com}{VbXED9YbQ7qQGcSZ0TlKPQ}{192.168.8.101}{192.168.8.101:9300},},

reason: zen-disco-receive(from master [{elastic1.example.com}{VbXED9YbQ7qQGcSZ0TlKPQ}{192.168.8.101}{192.168.8.101:9300}])

[2016-05-03 00:29:52,401][INFO ][http           ] [elastic3.example.com] publish_address {192.168.8.103:9200}, bound_addresses {192.168.8.103:9200}

[2016-05-03 00:29:52,401][INFO ][node           ] [elastic3.example.com] started


https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-health.html

[root@elastic3 ~]# curl 'http://192.168.8.101:9200/_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 

1462207733 00:48:53  elasticsearch_cluster green           3         3     10   5    0    0        0             0                  -                100.0% 

[root@elastic3 ~]# curl 'http://192.168.8.102:9200/_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 

1462207744 00:49:04  elasticsearch_cluster green           3         3     10   5    0    0        0             0                  -                100.0% 

[root@elastic3 ~]# curl 'http://192.168.8.103:9200/_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 

1462207751 00:49:11  elasticsearch_cluster green           3         3     10   5    0    0        0             0                  -                100.0% 

再看状态就对了

[root@elastic3 ~]# curl-XGET 'http://192.168.8.101:9200/_cluster/health/192.168.8.*'

{"cluster_name":"elasticsearch_cluster","status":"green","timed_out":false,"number_of_nodes":3,

"number_of_data_nodes":3,"active_primary_shards":0,"active_shards":0,"relocating_shards":0,

"initializing_shards":0,"unassigned_shards":0,"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":100.0}



至此，Elasticsearch集群搭建完成，更多集群相关的参数，请参看官方说明


补充:

https://github.com/mobz/elasticsearch-head

https://www.elastic.co/guide/en/marvel/current/introduction.html

head,Marvel等监控可视化插件有兴趣的朋友可以试下
Elasticsearch <wbr>负载均衡集群
Elasticsearch <wbr>负载均衡集群

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原文地址：https://www.cnblogs.com/lixuebin/p/10814098.html