Certificate verification failed, e.g. CRL, CA or signature check

[gjcarneiro]

In a normal config, I keep getting this error, I have no idea why. I have applied all the relevant configuration.

[2019/04/08 17:01:31] [error] [io_tls] flb_io_tls.c:304 X509 - Certificate verification failed, e.g. CRL, CA or signature check
[2019/04/08 17:01:31] [error] [filter_kube] upstream connection error

I had to configure with tls.verify Off to make it work, now I get [2019/04/08 17:03:01] [ info] [filter_kube] API server connectivity OK.

[gjcarneiro]

It turns out that I had to change the URL to:

        Kube_URL            https://kubernetes.default

I discovered this thanks to this comment: fluent/fluent-bit#367 (comment)