使用elasticsearch7.3版本在一台主机上部署多个实例组建集群

系统：centos 7.4 x64

主机ip:192.168.0.160

软件包：elasticsearch-7.3.0-linux-x86_64.tar.gz

配置步骤

vim /etc/security/limits.conf
* soft nofile 65537
* hard nofile 65537
* soft nproc 65537
* hard nproc 65537

vim /etc/sysctl.conf
vm.max_map_count = 262144
net.core.somaxconn = 65535
net.ipv4.ip_forward = 1

cd /usr/local/src
tar -zxv -f elasticsearch-7.3.0-linux-x86_64.tar.gz -C /usr/local/
cd /usr/local/
cp elasticsearch-7.3.0 elasticsearch-7.3.0_node1
cp elasticsearch-7.3.0 elasticsearch-7.3.0_node2
cp elasticsearch-7.3.0 elasticsearch-7.3.0_node3
useradd elastic
chown -R elastic:elastic elasticsearch-7.3.0_node1
chown -R elastic:elastic elasticsearch-7.3.0_node2
chown -R elastic:elastic elasticsearch-7.3.0_node3

# 如下是每个节点的配置文件内容
# 1
cluster.name: my-application
node.name: node-1

# 主节点
node.master: true
# 数据节点
node.data: true 

network.host: 192.168.0.160
http.port: 9200
transport.port: 9300

discovery.seed_hosts: ["192.168.0.160:9300", "192.168.0.160:9301","192.168.0.160:9302"]
cluster.initial_master_nodes: ["node-1"] # 确保当前节点是主节点

http.cors.enabled: true
http.cors.allow-origin: "*"

# 2
cluster.name: my-application
node.name: node-2

node.master: false
node.data: true 

network.host: 192.168.0.160
http.port: 9201
transport.port: 9301

discovery.seed_hosts: ["192.168.0.160:9300", "192.168.0.160:9301","192.168.0.160:9302"]
cluster.initial_master_nodes: ["node-1", "node-2","node3"]

http.cors.enabled: true
http.cors.allow-origin: "*"

# 3
cluster.name: my-application
node.name: node-3

node.master: false
node.data: true 

network.host: 192.168.0.160
http.port: 9202
transport.port: 9302

discovery.seed_hosts: ["192.168.0.160:9300", "192.168.0.160:9301","192.168.0.160:9302"]
cluster.initial_master_nodes: ["node-1","node-2","node-3"]

http.cors.enabled: true
http.cors.allow-origin: "*"

若报错说找不到主节点，可以先启动主节点，等主节点集群建立后，再启动从节点，观察从节点日志输出，确保从节点加入集群。

分别启动的话需要先切换到elastic普通用户，然后运行/usr/local/elasticsearch-7.3.0-cluster-node1/bin/elasticsearch

可以先分别启动查看状态，待配置无误后再用脚本启动

启动脚本

#!/bin/bash

/usr/bin/su - elastic -c '/usr/local/elasticsearch-7.3.0-cluster-node1/bin/elasticsearch -p /tmp/elasticsearch_9200_pid -d'
/usr/bin/su - elastic -c '/usr/local/elasticsearch-7.3.0-cluster-node2/bin/elasticsearch -p /tmp/elasticsearch_9201_pid -d'
/usr/bin/su - elastic -c '/usr/local/elasticsearch-7.3.0-cluster-node3/bin/elasticsearch -p /tmp/elasticsearch_9202_pid -d'

关闭脚本

#!/bin/bash

kill -9 `ps -u elastic|awk '{print $1}'`

测试

查看集群主从分配

http://192.168.0.160:9200/_cat/nodes?v

ip            heap.percent ram.percent cpu load_1m load_5m load_15m node.role master name
192.168.0.160           35          97   0    0.04    0.23     0.22 di        -      node-3
192.168.0.160           15          97   0    0.04    0.23     0.22 dim       *      node-1
192.168.0.160           31          97   0    0.04    0.23     0.22 di        -      node-2

查看集群状态

http://192.168.0.160:9200/_cluster/health?pretty

{
  "cluster_name": "my-application",
  "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
}

其他部署方式

还有一种部署方式是创建不同的配置文件路径来进行启动，比较麻烦就不实验了