Install and configure node-red on synology dsm 6 with docker

The main problem : the node-red instance does not use any dns server by default.

I managed to map /etc/resolv.conf of the container with a custom resolv.conf, but after that, the container can not communicate with another container easily.

In my case, i want to use in Node-red another container influxdb by its « influxdb1 » name, but influxdb1 as a hostname was not found by node-red with a mapped /etc/resolv.conf.

I had to re-create a node-red container with the -dns parameter for the command line.
(impossible to update this setting after the container is created)