一起养成写作习惯！这是我参与「掘金日新计划 · 4 月更文挑战」的第1天，点击查看活动详情。
一、安装Elasticsearch
ElasticSearch: mirrors.huaweicloud.com/elasticsear…
选择需要下载的版本
# 这里我选择7.14.0版本
wget https://mirrors.huaweicloud.com/elasticsearch/7.14.0/elasticsearch-7.14.0-linux-x86_64.tar.gz
# 解压
tar xvf elasticsearch/7.14.0/elasticsearch-7.14.0-linux-x86_64.tar.gz
注意：elasticsearch运行要求java版本最低为java8
jdk国内镜像下载：mirrors.huaweicloud.com/java/jdk
wget https://mirrors.huaweicloud.com/java/jdk/8u152-b16/jdk-8u152-linux-x64.tar.gz
tar xvf jdk-8u152-linux-x64.tar.gz
因为我要部署的机器是jdk1.7 所以我需要指定下启动的jdk环境，大家如果已经是java8以上的，可以忽略这个步骤
/home/appadmin/jdk/jdk1.8.0_152/
# 修改启动时 指定Java版本
vim bin/elasticsearch
# 添加如下配置
export JAVA_HOME=/home/appadmin/jdk/jdk1.8.0_152
export PATH=$JAVA_HOME/bin:$PATH
修改配置文件
network.host: 0.0.0.0
http.port: 9200
discovery.seed_hosts: ["host1", "host2"]
cluster.initial_master_nodes: ["node-1", "node-2"]
启动服务
./elasticsearch
启动过程中报错
ERROR: [1] bootstrap checks failed. You must address the points described in the following [1] lines before starting Elasticsearch.
bootstrap check failure [1] of [1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
ERROR: Elasticsearch did not exit normally - check the logs at /home/appadmin/elk/elasticsearch-7.14.0/logs/my-application.log
# 使用vmstat查看内存使用状况
vmstat
# 使用命令查看sysctl vm.max_map_count
sysctl vm.max_map_count
解决：
# 切换root用户
su root
vim /etc/sysctl.conf
# 添加配置 保存
vm.max_map_count=655360
# 使配置生效
sysctl -p
# elasticsearch不能以root用户启动，切换用户
再次启动elasticsearch服务
再次报错
max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
max number of threads [3773] for user [liangkeke] is too low, increase to at least [4096]
解决：
vim /etc/security/limits.conf
# 添加配置
* soft nofile 65535
* hard nofile 65537
* soft nproc 4096
* hard nproc 4096
配置完，切换用户启动elasticsearch服务即可
访问本机ip+9200端口号
二、安装管理插件elasticsearch-head
如果是本机安装，直接使用google插件就好，很方便。
远程的话安装麻烦一点
git clone https://github.com/mobz/elasticsearch-head.git
# 远程丢到服务器上
cd elasticsearch-head/
npm install
logstash: mirrors.huaweicloud.com/logstash/?C…
