Elasticsearch报错汇总

一、配置elasticsearch.yml文件错误

1. Elasticsearch8.4.0版本，配置文件中集群通信端口的配置名是transport.port，而7.几的是transport.tcp.port

二、启动ES服务失败报错

1. 问题：max number of threads [3795] for user [es] is too low
   修改配置文件：vim /etc/security/limits.conf，添加如下配置

   * soft nproc 5000
   * hard nproc 5000
   

2. 问题：max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
   修改配置文件：vim /etc/security/limits.conf，添加如下配置

   es soft nofile 65535
   es hard nofile 65537
   

3. 问题：bootstrap check failure [1] of [1]: Transport SSL must be enabled if security is enabled. Please set [xpack.security.transport.ssl.enabled] to [true] or disable security by setting [xpack.security.enabled] to [false]
   修改配置文件：vim /usr/local/elasticsearch-8.4.0/config/elasticsearch.yml，添加如下

   #关闭安全认证，才能访问es
   xpack.security.enabled: false
   xpack.security.http.ssl:
   			   enabled: false
   

4. 问题：“Action failed with [index_not_yellow_timeout] Timeout waiting for the status of the [.kibana_8.1.0_001] index to become “yellow”. Retrying attempt 1 in 2 seconds.”
   Elasticsearch8.3.0和8.4.0版本集群搭建成功后，启动kibana时，报上述异常，kibana无法连接上ES集群服务，等待集群状态变绿，百度搜查一天也没找到真正的解决方法，大概就是说未进行分片操作，但是也不知道怎么操作。搭建7.x版本的ES集群时，集群状态为非绿色，kibana也能连接到ES集群服务。