2022-04-17 | 标签 Elasticsearch

1. 下载软件

Elasticsearch 的官方地址：https://www.elastic.co/cn/
我选择 7.8.0 版本

2. 安装软件

2.1 将软件从本地上传到Linux

[mhk@hadoop102 software]$ ll

-rw-rw-r--. 1 mhk  mhk  319112561 3月  16 16:22 elasticsearch-7.8.0-linux-x86_64.tar.gz

2.2 解压缩到指定路径

[mhk@hadoop102 software]$ tar -zxvf elasticsearch-7.8.0-linux-x86_64.tar.gz -C /opt/module/

2.3 运行bin目录下的启动脚本

[mhk@hadoop102 elasticsearch-7.8.0]$ bin/elasticsearch
...
[2022-04-16T16:36:09,824][INFO ][o.e.h.AbstractHttpServerTransport] [hadoop102] publish_address {127.0.0.1:9200}, bound_addresses {[::1]:9200}, {127.0.0.1:9200}
[2022-04-16T16:36:09,826][INFO ][o.e.n.Node               ] [hadoop102] started
[2022-04-16T16:36:11,078][INFO ][o.e.l.LicenseService     ] [hadoop102] license [7ee9cff5-bb62-4949-b1b9-86535854a73e] mode [basic] - valid
[2022-04-16T16:36:11,081][INFO ][o.e.x.s.s.SecurityStatusChangeListener] [hadoop102] Active license is now [BASIC]; Security is disabled
[2022-04-16T16:36:11,391][INFO ][o.e.g.GatewayService     ] [hadoop102] recovered [0] indices into cluster_state

2.4 配置远程访问

打开 config/ 目录下的 elasticsearch.yml，修改配置

[mhk@hadoop102 elasticsearch-7.8.0]$ cd config/
[mhk@hadoop102 config]$ ll
总用量 40
-rw-rw----. 1 mhk mhk   199 4月  16 16:24 elasticsearch.keystore
-rw-rw----. 1 mhk mhk  2813 4月  16 17:16 elasticsearch.yml
-rw-rw----. 1 mhk mhk  2301 6月  15 2020 jvm.options
drwxr-x---. 2 mhk mhk     6 6月  15 2020 jvm.options.d
-rw-rw----. 1 mhk mhk 17419 6月  15 2020 log4j2.properties
-rw-rw----. 1 mhk mhk   473 6月  15 2020 role_mapping.yml
-rw-rw----. 1 mhk mhk   197 6月  15 2020 roles.yml
-rw-rw----. 1 mhk mhk     0 6月  15 2020 users
-rw-rw----. 1 mhk mhk     0 6月  15 2020 users_roles

[mhk@hadoop102 config]$ vim elasticsearch.yml

network.host: 0.0.0.0

再次运行启动脚本，发现报错

ERROR: [2] bootstrap checks failed
[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]
[3]: 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
ERROR: Elasticsearch did not exit normally - check the logs at /opt/module/elasticsearch-7.8.0/logs/elasticsearch.log

针对这三点，逐个击破 1、Linux系统的soft、hard值配置过低，至少65535

vim /etc/security/limits.conf
#*               soft    core            0
#*               hard    rss             10000
*               soft    nofile           65535
*               hard    nofile           65535

建议重启虚拟机

2、Linux系统vm.max_map_count值配置过低，至少262144

vim /etc/sysctl.conf
vm.max_map_count=262144
#sysctl -p   生效
[mhk@hadoop102 etc]$ sysctl -p
vm.max_map_count = 262144

3、缺少默认配置 至少需要配置 discovery.seed_hosts、discovery.seed_providers、cluster.initial_master_nodes 中的一个参数.

discovery.seed_hosts: 集群主机列表
discovery.seed_providers: 基于配置文件配置集群主机列表
cluster.initial_master_nodes: 启动时初始化的参与选主的node，生产环境必填 ```shell vim config/elasticsearch.yml

#添加配置 discovery.seed_hosts: [“hadoop102”]

cluster.initial_master_nodes: [“hadoop102”]

## 2.5 重启软件，访问web界面
[http://10.211.55.11:9200/](http://10.211.55.11:9200/)
```shell
[mhk@hadoop102 elasticsearch-7.8.0]$ bin/elasticsearch
...
[2022-04-16T17:46:23,701][INFO ][o.e.h.AbstractHttpServerTransport] [hadoop102] publish_address {10.211.55.11:9200}, bound_addresses {[::]:9200}
[2022-04-16T17:46:23,725][INFO ][o.e.n.Node               ] [hadoop102] started
[2022-04-16T17:46:25,348][INFO ][o.e.l.LicenseService     ] [hadoop102] license [7ee9cff5-bb62-4949-b1b9-86535854a73e] mode [basic] - valid
[2022-04-16T17:46:25,352][INFO ][o.e.x.s.s.SecurityStatusChangeListener] [hadoop102] Active license is now [BASIC]; Security is disabled
[2022-04-16T17:46:25,496][INFO ][o.e.g.GatewayService     ] [hadoop102] recovered [0] indices into cluster_state