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解决 Elasticsearch 修改密码报错 master_not_discovered_exception

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[root@bec9c25743ab bin]# elasticsearch-setup-passwords interactive

Failed to determine the health of the cluster running at http://172.18.0.4:9200
Unexpected response code [503] from calling GET http://172.18.0.4:9200/_cluster/health?pretty
Cause: master_not_discovered_exception

It is recommended that you resolve the issues with your cluster before running elasticsearch-setup-passwords.
It is very likely that the password changes will fail when run against an unhealthy cluster.

Do you want to continue with the password setup process [y/N]y

Initiating the setup of passwords for reserved users elastic,apm_system,kibana,logstash_system,beats_system,remote_monitoring_user.
You will be prompted to enter passwords as the process progresses.
Please confirm that you would like to continue [y/N]y


Enter password for [elastic]: 
Reenter password for [elastic]: 
Enter password for [apm_system]: 
Reenter password for [apm_system]: 
Enter password for [kibana]: 
Reenter password for [kibana]: 
Enter password for [logstash_system]: 
Reenter password for [logstash_system]: 
Enter password for [beats_system]: 
Reenter password for [beats_system]: 
Enter password for [remote_monitoring_user]: 
Reenter password for [remote_monitoring_user]: 

Unexpected response code [503] from calling PUT http://172.18.0.4:9200/_security/user/apm_system/_password?pretty
Cause: Cluster state has not been recovered yet, cannot write to the [null] index

Possible next steps:
* Try running this tool again.
* Try running with the --verbose parameter for additional messages.
* Check the elasticsearch logs for additional error details.
* Use the change password API manually. 

ERROR: Failed to set password for user [apm_system].

原因

没有设置 ElasticSearch 的主节点配置。

解决方法

在 elasticsearch.yml 配置文件中设置单节点或者集群节点的主节点名称即可。如：

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cluster.initial_master_nodes: ["node-1"]

如果为单节点，注意是否配置 node.name，二者要保持一致：

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node.name: node-1
cluster.initial_master_nodes: ["node-1"]

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