Linux下搭建Elasticsearch7.6.2集群

使用VMvare创建虚拟机

我的创建的三台分别是：
　　192.168.115.129    node-1
　　192.168.115.130    node-2
　　192.168.115.131    node-3

注意：克隆虚拟机的时候需要修改linux的ip策略为static，否则会导致ip一直在变

1：使用ifconfig命令查看我们Windows的网关

2：编辑虚拟机的ip ，这里只给出一份。其他两个虚拟机在克隆之后修改即可。

vi /etc/sysconfig/network-scripts/ifcfg-ens33

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
IPADDR=192.168.115.130 # 这里自定义ip，192.168不能变
GATEWAY=192.168.3.1  # 这里是前面Windows查到的网关地址
NAME=ens33
UUID=51ee4604-9cf3-40c9-9d7d-cc10e9eb513e
DEVICE=ens33
ONBOOT=yes

3.下载es安装包

https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.6.2-linux-x86_64.tar.gz

创建存放目录，然后使用工具上传

mkdir /usr/local/es/

4.解压

tar -zxvf elasticsearch-7.6.2-linux-x86_64.tar.gz

5. 修改配置文件

cd ./config
vi elasticsearch.yml 

这里给出node1的配置文件

# ======================== 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:
#
cluster.name: my-elasticsearch
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#
node.name: node-1
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
# 表示该节点会不会作为主节点，true表示会；false表示不会
node.master: true
# 当前节点是否用于存储数据，是：true、否：false
node.data: true
#
# ----------------------------------- Paths ------------------------------------
#
# Path to directory where to store the data (separate multiple locations by comma):
#
path.data: /usr/local/es/elasticsearch-7.6.2/data
#
# Path to log files:
#
path.logs: /usr/local/es/elasticsearch-7.6.2/logs
#
# ----------------------------------- Memory -----------------------------------
#
# Lock the memory on startup:
#
bootstrap.memory_lock: false
#
# 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):
#
network.host: 192.168.115.129
#
# Set a custom port for HTTP:
#
http.port: 9200
transport.tcp.port: 9300
#
# 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，写入候选主节点的设备地址，在开启服务后可以被选为主节点
discovery.seed_hosts: ["192.168.115.129","192.168.115.130","192.168.115.131"]
#
# Bootstrap the cluster using an initial set of master-eligible nodes:
discovery.zen.minimum_master_nodes: 2
# 判断结点是否脱离时间配置
discovery.zen.fd.ping_timeout: 60s
# 判断结点是否脱离次数配置
discovery.zen.fd.ping_retries: 5
# 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
# 表示开启蛞蝓访问支持，此值默认为fals
http.cors.enabled: true
# 表示跨域访问允许的域名地址，可使用正则表达式，“*”则表示允许所有域名访问
http.cors.allow-origin: "*"

6. jdk配置，es7.6.2需要依赖jdk11，不过7.0之后es自带jdk，如果我们自己安装的jdk，则会优先使用我们安装的，使用自带的话则需要修改配置。

具体修改可以参考该博客：
https://blog.csdn.net/xiaoxiong_web/article/details/105597150

7.创建普通用户

es无法使用root用户启动，所以我们需要创建一个用户用于es的启动

创建用户组   groupadd esgroup
创建用户     useradd -g esgroup es
设置权限     chown -R es:esgroup /usr/local/es/
设置密码     passwd es

8.修改linux内核参数

需要修改Linux文件打开最大数，否则启动会报错

修改/etc/security/limits.conf 增加下面内容

* soft nproc 65535* hard nproc 65535* soft nofile 65535* hard nofile 131072

修改/etc/sysctl.conf 增加内容： vm.max_map_count=655360

然后执行命令，使配置生效： sysctl -p

9.关闭防火墙

systemctl disable firewalld

完成以上步骤之后，开始克隆虚拟机（克隆完整镜像）

1）克隆完成之后，修改虚拟机的ip（上面有提到）

2）修改es的配置文件 elasticsearch.yml

其他两个节点只需修改node.name和host

node.name: node-2
twork.host: 192.168.115.130

node.name: node-3
twork.host: 192.168.115.131

到这里就大功告成了，切换到 es的 bin目录，启动

cd bin/
切换到之前创建的普通用户
su es
启动
./elasticsearch

注意：我遇到一个很坑的问题，因为我先启动一个节点的elasticsearch，然后再拷贝虚拟机去搭建集群，导致后面虽然配置文件没问题，但是三个节点独立存在，没有形成集群，一直以为是配置出了问题，到时候才知道需要删掉

es的data目录下的数据，否则不会更新节点信息。