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
23 Nov 20:45:52 ntpdate[16005]: 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 = 655360
[root@node2 ~]# cat /etc/security/limits.conf
* soft nofile 65536 * hard nofile 131072 * soft nproc 2048 * hard nproc 4096
[root@node2 ~]# cat /etc/security/limits.d/20-nproc.conf
* soft nproc 4096 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 "^$|[#;]" /usr/local/elasticsearch/config/elasticsearch.yml
cluster.name: my-elktest-cluster node.name: node-1 network.host: 0.0.0.0 http.port: 9200 discovery.seed_hosts: ["192.168.132.131","192.168.132.132","192.168.132.133"] cluster.initial_master_nodes: ["node-1","node-2","node-3"] http.cors.enabled: true http.cors.allow-origin: "*"
[root@node2 ~]# grep -Ev "^$|[#;]" /usr/local/elasticsearch/config/elasticsearch.yml
cluster.name: my-elktest-cluster node.name: node-2 network.host: 0.0.0.0 http.port: 9200 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-3 network.host: 0.0.0.0 http.port: 9200 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-1 192.168.132.132 node-2 192.168.132.133 node-3
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-2
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 32 95 0 0.00 0.01 0.05 dilm - node-3 192.168.132.131 35 80 0 0.00 0.01 0.05 dilm - node-1 192.168.132.132 29 96 0 0.00 0.01 0.05 dilm * node-2
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" : 3, "number_of_data_nodes" : 3, "active_primary_shards" : 5, "active_shards" : 15, "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 }
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