es启动

访问http://120.27.16.18:9200/，访问不到
需要添加
network.publish_host: 120.27.16.18配置 ip为服务器地址；

[2020-04-13T18:22:04,183][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [iZm5e4lh6e5qfekreixzfoZ] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root

是没设置elsearch权限

遇到得问题

http://ip:9200/ 无法访问
vim config/elasticsearch.yml

增加
network.host: 0.0.0.0

重启 es 异常

ERROR: [5] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
[2]: max number of threads [1024] for user [es] 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]: failed to install; check the logs and fix your configuration or disable system call filters at your own risk
[5]: 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
[2019-04-09T09:51:29,228][INFO ][o.e.n.Node ] [localhost.localdomain] stopping ...
[2019-04-09T09:51:29,264][INFO ][o.e.n.Node ] [localhost.localdomain] stopped
[2019-04-09T09:51:29,265][INFO ][o.e.n.Node ] [localhost.localdomain] closing ...
[2019-04-09T09:51:29,320][INFO ][o.e.n.Node ] [localhost.localdomain] closed
[2019-04-09T09:51:29,323][INFO ][o.e.x.m.p.NativeController] [localhost.localdomain] Native controller process has stopped - no new native processes can be started

主要出现下面三个错误
切换root用户
[root@localhost ~]# vi /etc/security/limits.conf
在文件的末尾加上
elsearch soft nofile 65536
elsearch hard nofile 65536
elsearch soft nproc 4096
elsearch hard nproc 4096

重启es 异常

ERROR: [3] bootstrap checks failed
[1]: max number of threads [1024] for user [es] is too low, increase to at least [4096]
[2]: system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk
[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

vi /etc/security/limits.d/90-nproc.conf
修改

```
     soft    nproc     1024
```

为

```
     soft    nproc     4096
```

修改下面文件加上内容
[root@localhost security]# vi /etc/sysctl.conf
vm.max_map_count = 655360
对于上面的内容让其生效
[root@localhost security]# sysctl -p
vm.max_map_count = 655360

重启es 异常

ERROR: [2] bootstrap checks failed
[1]: system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk
[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

在 elasticsearch.yml中添加配置项：bootstrap.system_call_filter为false：

bootstrap.memory_lock: false
bootstrap.system_call_filter: false

然后启动./elasticsearch