FluentD. How to send logs via https?

Question

System administration

Lord, welcome. I set up sending logs to ES with Kibana. The logs will be sent as hhtp packets over https to the FluentD host. After that, Fluent forwards them to the host with Elastic and Kibana. On the same host, FluentD is also installed, which will "accept" the logs and pack them locally in ES. Question on FlunetD configs, maybe someone came across. To forward logs over https, the secure_forward plugin is used. In which you need to specify:
*Pieces of the config from the docks*
ca_path /path/to/ca_file
cert_path /path/to/cert_path (the path to the certificate, in my case LetsEncryt, everything is clear with this, I specify the path to fullchain.pem)
private_key_path / path/to/priv_key (path to privkey.pem file)
private_key_passphrase "passphrase"
Where is "passphrase" written? ca_file in the context of LetsEncypt, what is this? Fluent won't start without these options

Answer 1

I probably already answered you in the cart, but I'll duplicate it, try two quotes if the software requires the "passphrase" parameter