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
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