1. kibana启动报错，kibana_system用户认证

[2022-09-06T19:47:01.491-04:00][ERROR][elasticsearch-service] Unable to retrieve version information from Elasticsearch nodes. security_exception: [security_exception] Reason: unable to authenticate user [kibana_system] for REST request [/_nodes?filter_path=nodes.*.version%2Cnodes.*.http.publish_address%2Cnodes.*.ip]

解决办法：设置kibana_system用户的密码。
[es@goya1 cert]$ elasticsearch-reset-password -u kibana_system -i
warning: ignoring JAVA_HOME=/app/elasticsearch/jdk; using bundled JDK
This tool will reset the password of the [kibana_system] user.
You will be prompted to enter the password.
Please confirm that you would like to continue [y/N]y
Enter password for [kibana_system]: changeit123
Re-enter password for [kibana_system]: changeit123
Password for the [kibana_system] user successfully reset.

修改,确认kibana.yml文件的配置部分：
# If your Elasticsearch is protected with basic authentication, these settings provide
# the username and password that the Kibana server uses to perform maintenance on the Kibana
# index at startup. Your Kibana users still need to authenticate with Elasticsearch, which
# is proxied through the Kibana server.
elasticsearch.username: "kibana_system"
elasticsearch.password: "changeit123"