eck logtash 8 version needs ca.crt of eck Elasticsearch. But i dont know how to access this ca.crt file using logstash. my log stash file has cacert location. but I don't know how to access ca.crt file.
You can get ca.cer in Elasticsearch pod. You might have to get the file from Elasticsearch pod and mount the same in logstash pod under some path and refer the same in logstash output plugin.
You also have option to skip SSL. However this is not recommended.
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