ElasticSearch学习三 集群安装
一、准备工作
1.1、下载ES安装包
到ElasticSearch 官网下载相应的版本：https://www.elastic.co/cn/downloads/past-releases#elasticsearch
Alt + p 打开SecureCRT的SFTP，使用put命令，把本地的elasticsearch-7.4.2-linux-x86_64.tar.gz上传到Linux服务器。
创建安装目录，并解压到 /usr/local目录
[root@localhost ~]# mkdir /usr/local/
[root@localhost ~]# tar -zxvf elasticsearch-7.4.2-linux-x86_64.tar.gz -C /usr/local/
1.2、创建用于启动ES的普通用户
ES不允许用root用户启动，因此需要创建一个用于启动ElasticSearch的普通用户，在此例子中，普通用于名为es，并把es用户添加到es组中
[root@localhost bin]# groupadd es
[root@localhost bin]# useradd es -g es
[root@localhost bin]# chown -Rf es:es /usr/local/elasticsearch-7.4.21.3、配置es用户的最大文件数与最大线程数
/etc/security/limits.conf在limits.conf文件末尾添加如下配置：
es soft nofile 65535
es hard nofile 65535
es soft nproc 4096
es hard nproc 4096因为我们是用es启动，因此需要修改es用户的
1.4、修改一个进程可以用户最大虚拟机内存
#修改/etc/sysctl.conf 文件
vi /etc/sysctl.conf
vm.max_map_count=262144
vm.swappiness=1
#让sysctl.conf重新生效
sysctl -p
1.5、防火墙的关闭
#查看开放了哪些服务端口
firewall-cmd --list-all
#开放端口号命令,永久生效
firewall-cmd --add-port=9200/tcp --permanent
#重启防火墙,使配置生效
systemctl restart firewalld.service二、设置配置文件
2.1、设置虚拟机参数
在ES解压目录下的config目录下的jvm.options中，打开G1垃圾回收期，关闭CMS垃圾回收器
#-XX:+UseConcMarkSweepGC
-XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly
-XX:+UseG1GC
2.2、修改JDK目录
在ES解压目录下的config目录下的bin目录中，修改elasticsearch-env
export JAVA_HOME=/usr/local/elasticsearch-7.4.2/jdk
2.3、配置elasticsearch.yml
搭建的集群有两个服务器：
192.168.2.135
192.168.2.128
135服务器
# ---------------------------------- Cluster -----------------------------------
#
# Use a descriptive name for your cluster:
#
cluster.name: es
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#
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):
#
#
path.data: /usr/local/elasticsearch-7.4.2/data
# Path to log files:
#
#path.logs: /path/to/logs
#
path.logs: /usr/local/elasticsearch-7.4.2/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):
#
network.host: 0.0.0.0
#
# Set a custom port for HTTP:
#
http.port: 9200
transport.profiles.default.port: 9301
#
# 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]"]
#
#discovery.seed_hosts: ["host1", "host2"]
discovery.seed_hosts: ["192.168.2.128:9302", "192.168.2.135:9301"]
# Bootstrap the cluster using an initial set of master-eligible nodes:
#
cluster.initial_master_nodes: ["node-1", "node-2"]
http.cors.enabled: true
http.cors.allow-origin: "*"
#
# 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
128服务器
# ======================== 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: es
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#
node.name: node-2
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
#
# ----------------------------------- Paths ------------------------------------
#
# Path to directory where to store the data (separate multiple locations by comma):
#
path.data: /usr/local/elasticsearch-7.4.2/data
#
# Path to log files:
#
path.logs: /usr/local/elasticsearch-7.4.2/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):
#
network.host: 0.0.0.0
#
# Set a custom port for HTTP:
#
http.port: 9200
transport.profiles.default.port: 9302
#
# 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]"]
#
discovery.seed_hosts: ["192.168.2.128:9302", "192.168.2.135:9301"]
#
# Bootstrap the cluster using an initial set of master-eligible nodes:
#
cluster.initial_master_nodes: ["node-1", "node-2"]
http.cors.enabled: true
http.cors.allow-origin: "*"
#
# 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
三、运行结果
在浏览器中输入
http://192.168.2.128:9200/_cat/nodes?pretty
出现
192.168.2.135 6 94 3 0.72 0.66 0.37 dilm - node-1
192.168.2.128 18 96 1 0.13 0.17 0.12 dilm * node-2
