Logstash could not be started because there is already another instance using the configured data directory. If you wish to run multiple instances, you must change the "path.data" setting.

 

问题原因是：

之前运行的instance有缓冲，默认保存在data目录下

 

解决方法：

cd data

ls -a

rm -f .lock

[elk@k8s-node data]$ ls -a
.  ..  dead_letter_queue  .lock  plugins  queue  uuid
[elk@k8s-node data]$ rm -f .lock