Log files are not being created when running fluentd as 1.12 swarm mode service about fluentd-docker-image HOT 4 CLOSED

@mapk0y using 127.0.0.1 instead of localhost works as expected for me as well. and is indeed a simple solution - thanks a lot!

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Does anyone know the differences between normal run and swarm?
I don't have docker swarm experience, so I don't have a fix idea in mind...

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I was also able to reproduce the same problem.
In my case "IPv6" had caused.

Not Swarm

[docker daemon] - (IPv6 localhost = ::1) -> [docker-proxy] - (IPv4) -> [fluentd container]

"docker-proxy" is userland TCP Proxy for localhost and hairpin NAT.
This also acts as Proxy between IPv6-IPv4.
Bind container ports to the host - Docker

Swarm

[docker daemon] - (IPv6 localhost = ::1) -> [NAT] -> [swarm load balancer] - [fluentd container]

This "NAT" is not likely support NAT64(IPv6 to IPv4), so packets have lost in "NAT".

There are some solutions

1. To use "127.0.0.1" instead of "localhost". Simple!!
2. Remove ::1 localhost ip6-localhost ip6-loopback from /etc/hosts.
3. Disable IPv6 on Linux?

Not examined about Why "docker daemon" is to give priority to "IPv6".

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Thanks @mapk0y !! Awesome answer 👍

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