Syslog driver to write log on the docker host is not working

Hi there!

I’m trying to configure the docker to use syslog driver to send the logs from my Docker container ( 7) to the host.

docker run -d --log-driver syslog --log-opt syslog-address=udp://{hostname}:514 -p 8888:80 myapp

container configuration:

"LogConfig": {
      "Type": "syslog",
      "Config": {
          "syslog-address": "udp://{hostname}:514"

The host is configured to listen the incoming logs in port UDP 514…

# Provides UDP syslog reception
$ModLoad imudp
$UDPServerRun 514

Using the following command from inside the docker log correctly the message into the host syslog:

 logger --udp -p -t myapp -n {hostname} -P 514 info some message!

But if I use syslog() and/or error_log() function of php from inside the container nothing happens…