解决：Elasticsearch外网访问的问题

一、外网访问问题
默认情况下，是不支持外网访问，如果你的Elasticsearch安装在其他机器上，你从外网去访问的时候，访问不到，不通。
那么需要修改配置。
进入文件夹：

elasticsearch-7.0.0/config$

修改：elasticsearch.yml文件
添加

network.host: 0.0.0.0

二、会报错

ERROR: [2] bootstrap checks failed
[1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
[2]: 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

三、解决方案

1.针对问题1

[1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

使用sudo用户修改文件：sudo vim /etc/sysctl.conf

添加一行配置：

vm.max_map_count=655360

查看是否生效：

sudo sysctl -p

2.针对问题2

[2]: 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

放开：

cluster.initial_master_nodes: ["node-1", "node-2"]

然后就启动elasticsearch，就可以通过外网访问了。