ELK学习实验003：Elasticsearch 集群安装

前面已经介绍了Elasticsearch这个工具，并对单机安装做了简单介绍，现在使用三台机器做一个elasticsearch集群

一 环境准备

1.1 机器准备

1.2 同步时间

[root@node* ~]# ntpdate ntp1.aliyun.com

 Nov :: ntpdate[]: adjust time server 120.25.115.20 offset -0.015719 sec

[root@node1 ~]# crontab -l

* * * * * /usr/sbin/ntpdate    ntp1.aliyun.com

1.3 检查其他配置

比如内核，文件连接等参数是否配置完成，三个节点都必须检查

[root@node2 ~]# sysctl -a|grep vm.max_map_count

vm.max_map_count = 

[root@node2 ~]# cat /etc/security/limits.conf

* soft  nofile
* hard  nofile
* soft  nproc
* hard  nproc   

[root@node2 ~]# cat /etc/security/limits.d/20-nproc.conf

*          soft    nproc
root       soft    nproc     unlimited

根据上篇文章下载并解压elasticsearch软件下面直接进入配置

二 各节点配置

2.1 主要配置文件

[root@node1 ~]# grep -Ev "^$|[#;]" /usr/local/elasticsearch/config/elasticsearch.yml

cluster.name: my-elktest-cluster
node.name: node-
network.host: 0.0.0.0
http.port:
discovery.seed_hosts: ["192.168.132.131","192.168.132.132","192.168.132.133"]
cluster.initial_master_nodes: ["node-1","node-2","node-3"]
http.cors.enabled: true
http.cors.allow-origin: "*"

[root@node2 ~]# grep -Ev "^$|[#;]" /usr/local/elasticsearch/config/elasticsearch.yml

cluster.name: my-elktest-cluster
node.name: node-
network.host: 0.0.0.0
http.port:
discovery.seed_hosts: ["192.168.132.131","192.168.132.132","192.168.132.133"]
cluster.initial_master_nodes: ["node-1","node-2","node-3"]
http.cors.enabled: true
http.cors.allow-origin: "*"

[root@node3 ~]# grep -Ev "^$|[#;]" /usr/local/elasticsearch/config/elasticsearch.yml

cluster.name: my-elktest-cluster
node.name: node-
network.host: 0.0.0.0
http.port:
discovery.seed_hosts: ["192.168.132.131","192.168.132.132","192.168.132.133"]
cluster.initial_master_nodes: ["node-1","node-2","node-3"]
http.cors.enabled: true
http.cors.allow-origin: "*"

[root@node* ~]# vi /etc/hosts

192.168.132.131   node-
192.168.132.132   node-
192.168.132.133   node-

2.2 启动服务

[root@node1 ~]# systemctl restart elasticsearch

[root@node2 ~]# systemctl restart elasticsearch

[root@node3 ~]# systemctl restart elasticsearch

2.3 检查服务状态

[root@node* ~]# systemctl status elasticsearch

三个节点都启动，出现以上状态，说明三个服务已经起来了

2.4 使用elasticsearch-head检查

新建一个索引

结果

三 集群简单测试

3.1 测试slave节点

关掉node2节点

[root@node2 ~]# systemctl stop elasticsearch

数据还在，开启node2

[root@node2 ~]# systemctl start elasticsearch

观察

集群回复正常状态

3.2 测试主节点宕机，对集群影响

关闭主节点

五角星代表是主节点，圆点代表从节点

[root@node1 ~]# systemctl stop elasticsearch

可以看到node-1节点不在，master节点已经转移到node-2上，数据也分不到node-2和node-3上

恢复node-1

[root@node1 ~]# systemctl start  elasticsearch

集群回复正常

四 使用curl简单的查看集群信息

4.1 查看master节点

[root@node1 ~]# curl http://192.168.132.131:9200/_cat/master

9qVjdVSvSAGlZ7lpB9O78g 192.168.132.132 192.168.132.132 node-

4.2 查看数据节点

[root@node1 ~]# curl -XGET http://127.0.0.1:9200/_cat/nodes?pretty

192.168.132.133    0.00 0.01 0.05 dilm - node-
192.168.132.131    0.00 0.01 0.05 dilm - node-
192.168.132.132    0.00 0.01 0.05 dilm * node-

4.3 查看集群健康状态

[root@node1 ~]# curl localhost:9200/_cluster/health?pretty

{
  "cluster_name" : "my-elktest-cluster",
  "status" : "green",
  "timed_out" : false,
  "number_of_nodes" : ,
  "number_of_data_nodes" : ,
  "active_primary_shards" : ,
  "active_shards" : ,
  "relocating_shards" : ,
  "initializing_shards" : ,
  "unassigned_shards" : ,
  "delayed_unassigned_shards" : ,
  "number_of_pending_tasks" : ,
  "number_of_in_flight_fetch" : ,
  "task_max_waiting_in_queue_millis" : ,
  "active_shards_percent_as_number" : 100.0
}

4.4其他的查看命令

[root@node1 ~]# curl localhost:9200/_cat

=^.^=
/_cat/allocation
/_cat/shards
/_cat/shards/{index}
/_cat/master
/_cat/nodes
/_cat/tasks
/_cat/indices
/_cat/indices/{index}
/_cat/segments
/_cat/segments/{index}
/_cat/count
/_cat/count/{index}
/_cat/recovery
/_cat/recovery/{index}
/_cat/health
/_cat/pending_tasks
/_cat/aliases
/_cat/aliases/{alias}
/_cat/thread_pool
/_cat/thread_pool/{thread_pools}
/_cat/plugins
/_cat/fielddata
/_cat/fielddata/{fields}
/_cat/nodeattrs
/_cat/repositories
/_cat/snapshots/{repository}
/_cat/templates

实验基本完成，后续在做关于集群的其他实验