ElasticSearch 启动报错

修改 elasticsearch.yml 配置文件，允许外网访问。

VIM config/elasticsearch.yml

network.host: 0.0.0.0

启动失败，检查没有通过，报错

[2018-05-18T17:44:59,658][INFO ][o.e.b.BootstrapChecks ] [gFOuNlS] bound or publishing to a non-loopback address, enforcing bootstrap checks
ERROR: [2] bootstrap checks failed
[1]: max file descriptors [4096] for Elasticsearch process is too low, increase to at least [65536]

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

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

编辑 /etc/security/limits.conf，追加以下内容；
* soft nofile 4096
* hard nofile 65536
此文件修改后需要重新登录用户，才会生效

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

编辑 /etc/sysctl.conf，追加以下内容：
vm.max_map_count=655360
保存后，执行：

sysctl -p

重新启动，成功。

bin/elasticsearch

启动不能使用 root 账号，需要新建一个账号。

然后解决下权限问题：chown -R elastic:elastic /opt/soft/es
-R 是循环设置