之前項目中用過ElasticSearch，是一個不錯的搜索引擎，現在想深入的學習一下，嘗試自己安裝，遇到不少困難，踩了不少坑，參考網上很多優秀的文章得以解決，下面對自己的安裝過程做一個記錄：
一、環境準備
- 虛擬機、jdk還用原先準備好的，環境準備可以參考另一篇文章環境搭建
- 下載elasticsearch安裝包
下載鏈接：https://pan.baidu.com/s/1G9AmQ3iflTl4R7hJvjVbPA
提取碼：jjg6
二、安裝es
1、將壓縮包上傳到虛擬機指定目錄，並解壓，整體命令如下：
[root@localhost ~]# cd /usr
[root@localhost usr]# mkdir elastic
[root@localhost usr]# cd elastic
[root@localhost elastic]# rz
[root@localhost elastic]# tar -zxvf elasticsearch-7.1.1-linux-x86_64.tar.gz
[root@localhost elastic]# ls
elasticsearch-7.1.1 elasticsearch-7.1.1-linux-x86_64.tar.gz
三、啓動
啓動遇到很多問題，需要做很多配置：
1、不支持root用戶啓動
需要創建其他用戶登錄，賦予權限，並啓動
- 添加並切換用戶
user add zrk
tail -1 /etc/passwd
passwd zrk
chown -R zrk elasticsearch-7.1.1
su - zrk
- 啓動
cd /usr/elastic/elasticsearch-7.1.1/bin
./elasticsearch
#後臺啓動
./elasticsearch -d
2、bootstrap checks failed
報錯信息：
ERROR: [4] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
[2]: max number of threads [3891] for user [zrk] is too low, increase to at least [4096]
[3]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
[4]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured
解決方法：參考鏈接
3、外網無法訪問
通過瀏覽器無法訪問到虛擬機的9200端口
解決辦法：參考鏈接
四、訪問
[root@localhost elastic]# curl localhost:9200
{
"name" : "localhost.localdomain",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "Z3U7OMa7QDOEmP9Cdw69dg",
"version" : {
"number" : "7.1.1",
"build_flavor" : "default",
"build_type" : "tar",
"build_hash" : "7a013de",
"build_date" : "2019-05-23T14:04:00.380842Z",
"build_snapshot" : false,
"lucene_version" : "8.0.0",
"minimum_wire_compatibility_version" : "6.8.0",
"minimum_index_compatibility_version" : "6.0.0-beta1"
},
"tagline" : "You Know, for Search"
}
虛擬機、瀏覽器(postman代替)皆可訪問