elasticsearch集群部署

前提是先安装jdk，最好是jdk11（部署略过，可以参考https://blog.youkuaiyun.com/qq_41788609/article/details/108361975）

1、下载安装包：

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.9.0-linux-x86_64.tar.gz

2、部署：

#创建部署目录
mkdir -p /home/elk
#解压   
tar -xf elasticsearch-7.9.0-linux-x86_64.tar.gz
mv elasticsearch-7.9.0 /home/elk/
#创建用户
groupadd elasticsearch
useradd elasticsearch -g elasticsearch
#创建数据存储路劲和日志存放路径
mkdir -p /data/elasticsearch/{data,logs}

3、修改配置：

vim /home/elk/elasticsearch-7.9.0/config/elasticsearch.yml
配置内容在后面

4、启动（不能用root启动）：

chown -R elasticsearch. /data/elasticsearch/
chown -R elasticsearch. /home/elk/
su - elasticsearch
cd /home/elk/elasticsearch-7.9.0/bin
./elasticsearch -d

5、查询集群状态：

curl 'localhost:9200/_cluster/health?pretty'

6、查看端口号，分别为9200和9300

ss -ntulp| egrep "9200|9300"

7、配置文件内容：
节点1：

cluster.name: elk
node.name: node1
node.master: true
node.data: true
http.cors.enabled: true
http.cors.allow-origin: /.*/
path.data: /data/elasticsearch/data
path.logs: /data/elasticsearch/logs
network.host: 0.0.0.0
http.port: 9200
discovery.seed_hosts: ["192.168.245.233", "192.168.245.237", "192.168.245.238"]
cluster.initial_master_nodes: ["node1", "node2","node3"]

节点2：

cluster.name: elk
node.name: node2
node.master: true
node.data: true
http.cors.enabled: true
http.cors.allow-origin: /.*/
path.data: /data/elasticsearch/data
path.logs: /data/elasticsearch/logs
network.host: 0.0.0.0
http.port: 9200
discovery.seed_hosts: ["192.168.245.233", "192.168.245.237", "192.168.245.238"]
cluster.initial_master_nodes: ["node1", "node2","node3"]

节点3

cluster.name: elk
node.name: node3
node.master: true
node.data: true
http.cors.enabled: true
http.cors.allow-origin: /.*/
path.data: /data/elasticsearch/data
path.logs: /data/elasticsearch/logs
network.host: 0.0.0.0
http.port: 9200
discovery.seed_hosts: ["192.168.245.233", "192.168.245.237", "192.168.245.238"]
cluster.initial_master_nodes: ["node1", "node2","node3"]

8、启动报错：

[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

需要配置/etc/security/limits.conf和/etc/sysctl.conf，在末尾加上如下内容

vim /etc/security/limits.conf

* soft nofile 65536
* hard nofile 65536
* soft nproc 4096
* hard nproc 4096

vim /etc/sysctl.conf

vm.max_map_count=262144

配置重新生效

sysctl -p

9、安装elasticsearch-head插件
安装nodejs：

wget https://nodejs.org/dist/v16.13.0/node-v16.13.0-linux-x64.tar.xz
tar -xvf node-v16.13.0-linux-x64.tar.xz
mv node-v16.13.0-linux-x64 /usr/local/

vim /etc/profile
#加上环境变量
export PATH=$PATH:/usr/local/node-v16.13.0-linux-x64/bin

#验证
 node -v

安装elasticsearch-head

yum install git
git clone https://github.com/mobz/elasticsearch-head.git
mv elasticsearch-head/ /home/elk/
cd  /home/elk/elasticsearch-head/
cd elasticsearch-head/
npm install  
#可能报错，执行下面语句
npm install phantomjs-prebuilt@2.1.16 --ignore-scripts
#启动
nohup npm run start &

网页访问9100端口即可