elasticsearch异常问题 discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured

本文使用环境  centos7.x   elasticsearch7.6.2   JDK1.8

错误：文件权限不足      [1]: max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]

再次启动，又出错了：

[1]: max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]

　　

我们用的是新创建的用户，而不是root，所以文件权限不足。

首先用root用户登录。

然后修改配置文件:

vim /etc/security/limits.conf

添加下面的内容：

* soft nofile 65536
​
* hard nofile 131072
​
* soft nproc 4096
​
* hard nproc 4096

错误：线程数不够       [1]: max number of threads [1024] for user [leyou] is too low, increase to at least [4096]

刚才报错中，还有一行：

[1]: max number of threads [1024] for user [leyou] is too low, increase to at least [4096]

这是线程数不够。

继续修改配置：

vim /etc/security/limits.d/20-nproc.conf 

修改下面的内容：

* soft nproc 1024

改为：

* soft nproc 4096

错误：进程虚拟内存     [3]: max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]

vm.max_map_count：限制一个进程可以拥有的VMA(虚拟内存区域)的数量，继续修改配置文件， ：

vim /etc/sysctl.conf 

添加下面内容：

vm.max_map_count=655360

然后执行命令：

sysctl -p

错误   bootstrap checks faile     [1]: 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: [1] bootstrap checks failed
[1]: 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 /home/leyou/elasticsearch/logs/elasticsearch.log
[2020-04-05T17:27:09,233][INFO ][o.e.n.Node               ] [localhost.localdomain] stopping ...
[2020-04-05T17:27:09,313][INFO ][o.e.n.Node               ] [localhost.localdomain] stopped
[2020-04-05T17:27:09,313][INFO ][o.e.n.Node               ] [localhost.localdomain] closing ...
[2020-04-05T17:27:09,345][INFO ][o.e.n.Node               ] [localhost.localdomain] close

修改conf-->elasticsearch.yml

elasticsearch.yml文件
​
node.name: node-1 前面的#打开
​
#network.host: 192.168.0.1
network.host: 192.168.136.110
#network.host: 0.0.0.0
#network.host: localhost
#network.host: 127.0.0.1  这里把network.host 设置为自己的ip地址 也可以设置成0.0.0.0（代表所有ip可以访问）
​
cluster.initial_master_nodes: ["node-1"] 这里一定要这样设置，我就是这里没有这样设置出问题的，弄了好久
这里的   node-1   是上面node.name：后面的对应值
​
在最后加上这两句，要不然，外面浏览器就访问不了哈
​
http.cors.enabled: true
http.cors.allow-origin: "*"