traefik with systemd don't see containers docker - traefik

Question

I want to start traefik trough systemd, but I don't have the same results with systemd vs manual start.
Here is an example of when I start traefik manually:
$ traefik --web \
--docker \
--docker.domain=docker
$ docker ps -q
164f73add870
$ # check traefik api
$ http http://localhost:8080/api/providers
http http://localhost:8080/api/providers
HTTP/1.1 200 OK
Content-Length: 377
Content-Type: application/json; charset=UTF-8
Date: Sun, 15 Oct 2017 10:26:09 GMT
{
"docker": {
"backends": {
"backend-rancher": {
"loadBalancer": {
"method": "wrr"
},
"servers": {
"server-rancher": {
"url": "http://172.17.0.2:8080",
"weight": 0
}
}
}
},
"frontends": {
"frontend-Host-rancher-docker": {
"backend": "backend-rancher",
"basicAuth": [],
"entryPoints": [
"http"
],
"passHostHeader": true,
"priority": 0,
"routes": {
"route-frontend-Host-rancher-docker": {
"rule": "Host:rancher.docker"
}
}
}
}
}
}
And when I use systemd:
$ sudo systemctl status traefik
● traefik.service - Traefik reverse proxy
Loaded: loaded (/usr/lib/systemd/system/traefik.service; enabled; vendor preset: disabled)
Active: active (running) since Sun 2017-10-15 12:27:35 CEST; 4s ago
Main PID: 12643 (traefik)
Tasks: 9 (limit: 4915)
Memory: 14.6M
CPU: 256ms
CGroup: /system.slice/traefik.service
└─12643 /usr/bin/traefik --web --docker --docker.domain=docker
Oct 15 12:27:35 devbox systemd[1]: Started Traefik reverse proxy.
$ docker ps -q
164f73add870
$ # check traefik api
$ http http://localhost:8080/api/providers
HTTP/1.1 200 OK
Content-Length: 2
Content-Type: application/json; charset=UTF-8
Date: Sun, 15 Oct 2017 10:28:18 GMT
{}
Any idea why I don't see my container docker ?

Answer 1

By adding this with my user/group, it works!
[Service]
User=...
Group=...