最近启用filebeat连ES的时候报错：couldn't connect to any of the configured Elasticsearch hosts
提示无法连接，原因有2个:
原因一： ES配置了密码认证，filebeat里面也需要配置对应的将账号密码配置进去；
output.elasticsearch: hosts: [""] username: "elastic" password: " " setup.kibana: host: " "
原因二：从库使用命令行请求ES，发现连接拒绝；
查看配置发现是ES 默认localhost访问，其他机器要访问需要修改配置
ES elasticsearch.yml 末尾添加配置
network.host: 0.0.0.0
Kibana也需要添加配置
server.host: "0.0.0.0"
重启生效后curl访问测试：
启动filebeat:
filebeat setup Overwriting ILM policy is disabled. Set `setup.ilm.overwrite: true` for enabling. Index setup finished. Loading dashboards (Kibana must be running and reachable) Loaded dashboards Setting up ML using setup --machine-learning is going to be removed in 8.0.0. Please use the ML app instead. See more: https://www.elastic.co/guide/en/machine-learning/current/index.html Loaded machine learning job configurations Loaded Ingest pipelines
ES日志可以看到已经成功加载
[2021-11-17T10:19:27,234][INFO ][o.e.x.i.a.TransportPutLifecycleAction] [xxxxL] adding index lifecycle policy [filebeat]
[2021-11-17T10:19:29,564][INFO ][o.e.c.m.metadataIndexTemplateService] [xxxxL] adding template [filebeat-7.15.1] for index patterns [filebeat-7.15.1-*]
[2021-11-17T10:19:29,934][INFO ][o.e.c.m.metadataCreateIndexService] [xxxxL] [filebeat-7.15.1-2021.11.17-000001] creating index, cause [api], templates [filebeat-7.15.1], shards [1]/[1]
[2021-11-17T10:19:30,206][INFO ][o.e.x.i.IndexLifecycleTransition] [xxxxL] moving index [filebeat-7.15.1-2021.11.17-000001] from [null] to [{"phase":"new","action":"complete","name":"complete"}] in policy [filebeat]
[2021-11-17T10:19:30,366][INFO ][o.e.x.i.IndexLifecycleTransition] [xxxxL] moving index [filebeat-7.15.1-2021.11.17-000001] from [{"phase":"new","action":"complete","name":"complete"}] to [{"phase":"hot","action":"unfollow","name":"branch-check-unfollow-prerequisites"}] in policy [filebeat]
[2021-11-17T10:19:30,642][INFO ][o.e.x.i.IndexLifecycleTransition] [xxxxL] moving index [filebeat-7.15.1-2021.11.17-000001] from [{"phase":"hot","action":"unfollow","name":"branch-check-unfollow-prerequisites"}] to [{"phase":"hot","action":"rollover","name":"check-rollover-ready"}] in policy [filebeat]
[INFO ][o.e.c.m.metadataIndexTemplateService] [xxxxL] adding template [filebeat-7.15.1] for index patterns [filebeat-7.15.1-*]
