一、集群部署规划
版本选择：
Os版本： CentOS-7-x86_64-DVD-1810
Jdk版本： jdk-8u151
ES版本： elasticsearch-7.3.1
部署节点：
三台虚拟机 ：centos-01、centos-02、centos-03
二、基础环境搭建
2.1虚拟机环境网络配置：
vi /etc/sysconfig/network-scripts/ ifcfg-ens33
先让它动态分配一个ip地址 ：ONBOOT=yes
重启网卡
service network restart
查看动态分配的ip
ip add
再设置静态ip地址
BOOTPROTO=static
IPADDR=192.168.98.128
NETMASK=255.255.255.0
GATEWAY=192.168.98.1
最后再次重启网卡
service network restart
ip add
2.2配置主机和ip的映射关系：
vi /etc/hosts
2.3关闭防火墙：
查看防火墙状态：
firewall-cmd --state
临时关闭防火墙：
Systemctl stop firewalld.service
永久关闭防火墙：
Systemctl disable firewalld
2.4.安装jdk：
上传jdk并解压缩：
tar -zxvf jdk-8u151-linux-x64.tar.gz
配置环境变量
vi /etc/profile
export JAVA_HOME=/usr/local/jdk1.8.0_151
export PATH=$PATH:$JAVA_HOME/bin
使配置文件生效：
source /etc/profile
2.5创建elasticsearch用户
为了安全es不允许使用root用户启动，建议创建一个单独的用户来运行elasticsearch。
创建elasticsearch用户及设置密码：
adduser elasticsearch
passwd elasticsearch
2.6三台机器elasticsearch用户的免密配置
切换到elasticsearch用户
su elasticsearch
生成本机的公钥：
ssh-keygen -t rsa
cd ~/.ssh/
将本地的公钥复制为authorized_keys文件。
cp id_rsa.pub authorized_keys
将本地的公钥复制到其他主机的authorized_keys文件中
ssh-copy-id -i centos-02
三、部署elasticsearch
3.1上传elasticsearch并解压缩
tar -zxvf elasticsearch-7.3.1-linux-x86_64.tar.gz
3.2创建elasticsearch的数据存储目录和日志存储目录
mkdir -p /data/elasticsearch/data
mkdir -p /data/elasticsearch/logs
3.3更改文件的拥有者为elasticsearch用户
chown -R elasticsearch /data/elasticsearch/data
chown -R elasticsearch /data/elasticsearch/logs
chown -R elasticsearch /usr/local/elasticsearch-7.3.1
3.4 修改es集群的配置参数
centos-01节点：
vi config/elasticsearch.yml
# ======================== Elasticsearch Configuration =========================
#
# NOTE: Elasticsearch comes with reasonable defaults for most settings.
# Before you set out to tweak and tune the configuration, make sure you
# understand what are you trying to accomplish and the consequences.
#
# The primary way of configuring a node is via this file. This template lists
# the most important settings you may want to configure for a production cluster.
#
# Please consult the documentation for further information on configuration options:
# https://www.elastic.co/guide/en/elasticsearch/reference/index.html
#
# ---------------------------------- Cluster -----------------------------------
#
# Use a descriptive name for your cluster:
#集群名称
cluster.name: my-elasticsearch
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#节点名称
node.name: node-1
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
#
# ----------------------------------- Paths ------------------------------------
#
# Path to directory where to store the data (separate multiple locations by comma):
#索引数据存放的位置
path.data: /data/elasticsearch/data
#
# Path to log files:
#日志文件存放的位置
path.logs: /data/elasticsearch/logs
#
# ----------------------------------- Memory -----------------------------------
#
# Lock the memory on startup:
#
#bootstrap.memory_lock: true
#
# Make sure that the heap size is set to about half the memory available
# on the system and that the owner of the process is allowed to use this
# limit.
#
# Elasticsearch performs poorly when the system is swapping the memory.
#
# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#监听地址，用于访问该elasticsearch
network.host: 192.168.98.128
#
# Set a custom port for HTTP:
#
#http.port: 9200
#
# For more information, consult the network module documentation.
#
# --------------------------------- Discovery ----------------------------------
#
# Pass an initial list of hosts to perform discovery when this node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#es7.x之后新增的配置，写入候选节点的设备地址，在开启服务后可以被选为主节点
discovery.seed_hosts: ["centos-01", "centos-02","centos-03"]
#
# Bootstrap the cluster using an initial set of master-eligible nodes:
#es7.x之后新增的配置，初始化一个新的集群时需要此配置来选举master
cluster.initial_master_nodes: ["node-1", "node-2", "node-3"]
#
# For more information, consult the discovery and cluster formation module documentation.
#
# ---------------------------------- Gateway -----------------------------------
#
# Block initial recovery after a full cluster restart until N nodes are started:
#
#gateway.recover_after_nodes: 3
#
# For more information, consult the gateway module documentation.
#
# ---------------------------------- Various -----------------------------------
#
# Require explicit names when deleting indices:
#
#action.destructive_requires_name: true
#是否支持跨域
http.cors.enabled: true
#*表示支持所有域名
http.cors.allow-origin: "*"
centos-02节点修改如下配置：
#节点名称
node.name: node-2
#监听地址，用于访问该elasticsearch
network.host: 192.168.98.129
centos-03节点修改如下配置：
#节点名称
node.name: node-3
#监听地址，用于访问该elasticsearch
network.host: 192.168.98.130
3.5 一些特殊配置
因启动报错：
[1]每个进程最大同时打开文件数太小。
解决方法:
vi /etc/security/limits.conf
添加
* soft nofile 65536
* hard nofile 65536
注：“*”表示给所有用户起作用
[2]最大线程个数太低。
解决方法:
vi /etc/security/limits.conf
添加
* soft nproc 4096
* hard nproc 4096
[3]每个进程可以拥有的VMA(虚拟内存区域)的数量太低。
解决办法：
vi /etc/sysctl.conf
添加
vm.max_map_count=262144
记得sysctl –p 生效。
四、启动es
切换到elasticsearch用户
su elasticsearch
在三台机器上分别启动es
./bin/elasticsearch
后台启动方式
./bin/elasticsearch –d
五、访问es
curl -XGET centos-01:9200
curl -XGET centos-01:9200/_cat/nodes?v
六、关闭es
jps | grep Elasticsearch
kill -9 11827
七、遇到的错误：
原因是有两个独立的集群，删除要加入的集群的data目录下的数据。
八、参考
1、https://www.cnblogs.com/remainsu/p/elasticsearch-711-ji-qun-huan-jing-da-jian.html
2、https://www.cnblogs.com/zhi-leaf/p/8484337.html
3、https://blog.51cto.com/860143/2422797?source=dra
4、https://www.cnblogs.com/nr-zhang/p/9084820.html