CentOS 7/8 部署Elasticsearch集群

首先要安装JDK，参考 https://www.cnblogs.com/dotqin/p/13560419.html

环境说明：三台百度云服务器，内网IP分别为: 192.168.32.36、192.168.32.37、192.168.32.38, 不开放公网IP访问

分别在三台服务器上执行以下操作：

1.创建目录及下载解压（下载速度很慢）

cd /usr/local/
mkdir elasticsearch
cd elasticsearch
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.9.1-linux-x86_64.tar.gz
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.9.1-linux-x86_64.tar.gz.sha512
yum install perl-Digest-SHA
shasum -a 512 -c elasticsearch-7.9.1-linux-x86_64.tar.gz.sha512
tar -xzf elasticsearch-7.9.1-linux-x86_64.tar.gz
mkdir -p /data/elasticsearch/data
mkdir -p /data/elasticsearch/logs

2.设置用户和权限

groupadd elasticsearch
useradd elasticsearch -g elasticsearch
chown -R elasticsearch:elasticsearch /usr/local/elasticsearch/
chown -R elasticsearch:elasticsearch /data/elasticsearch/

3.编辑配置文件

cd /usr/local/elasticsearch/elasticsearch-7.9.1/config
vim elasticsearch.yml
# 添加或修改以下内容
cluster.name: elsearch-cluster
node.name: node-1 # 每台不一样
path.data: /data/elasticsearch/data
path.logs: /data/elasticsearch/logs
bootstrap.memory_lock: true
network.host: 192.168.32.36 # 每台不一样
http.port: 9200
discovery.seed_hosts: ["192.168.32.36", "192.168.32.37", "192.168.32.38"]
cluster.initial_master_nodes: ["node-1", "node-2", "node-3"]

vim jvm.options
# 修改以下内容 建议为服务器内存的一半
-Xms8g
-Xmx8g

4.设置一些其他参数

echo "elasticsearch - nofile 65535" >> /etc/security/limits.conf
echo "elasticsearch soft memlock unlimited" >> /etc/security/limits.conf
echo "elasticsearch hard memlock unlimited" >> /etc/security/limits.conf
echo "vm.swappiness=1" >> /etc/sysctl.conf
echo "vm.max_map_count=262144" >> /etc/sysctl.conf
设置完成后需要重启

5.添加到服务管理

vim /usr/lib/systemd/system/elasticsearch.service
# 添加以下内容
[Unit]
Description=elasticsearch-7.9.1 service
After=syslog.target network.target

[Service]
Restart=always
RestartSec=1
Type=forking
TimeoutSec=120

User=elasticsearch
Environment=JAVA_HOME=/usr/local/java/jdk1.8.0_261
LimitMEMLOCK=infinity

ExecStart=/usr/local/elasticsearch/elasticsearch-7.9.1/bin/elasticsearch -d -p /usr/local/elasticsearch/elasticsearch-7.9.1/elsearch.pid
ExecStop=/usr/bin/pkill -F /usr/local/elasticsearch/elasticsearch-7.9.1/elsearch.pid

[Install]
WantedBy=multi-user.target

6.设置服务生效及开机自启动

systemctl daemon-reload
systemctl enable elasticsearch.service

7.启动elasticsearch

systemctl start elasticsearch
systemctl status elasticsearch