I’m trying to setup an evcc’s docker compose setup.
They do recommend the following configuration:
services:
evcc:
command:
- evcc
container_name: evcc
image: evcc/evcc:latest
ports:
- 7070:7070/tcp
- 8887:8887/tcp
- 7090:7090/udp
- 9522:9522/udp
volumes:
- /etc/evcc.yaml:/etc/evcc.yaml
- /home/[user]/.evcc:/root/.evcc
restart: unless-stopped
In my case, I want to bind all the volumes of my docker instances to my NAS(like this if it fails, my data & configuration are safe) through NFS(and also configure it for traefik):
version: "3.9"
services:
evcc:
command:
- evcc
image: evcc/evcc:latest
ports:
- 7070:7070/tcp
- 8887:8887/tcp
- 7090:7090/udp
- 9522:9522/udp
volumes:
- evcc-config/evcc.yaml:/etc/evcc.yaml
- evcc-config/.evcc:/root/.evcc
labels:
- "traefik.enable=true"
- "traefik.http.routers.evcc.rule=Host(`evcc.mydomain.com`)"
- "traefik.http.routers.evcc.entrypoints=websecure"
- "traefik.http.routers.evcc.tls.certresolver=myresolver"
- "traefik.http.services.evcc.loadbalancer.server.port=7070"
volumes:
evcc-config:
driver_opts:
type: "nfs"
o: "addr=192.168.0.60,nolock,rw,soft"
device: ":/volume2/apps/config/evcc"
But it doesn’t seems to like the volume with a file, I get the following error:
service evcc: undefined volume “evcc-config/evcc.yaml”
My guess is that I cannot bind a path with a named binding? But then, how to do similar with it?
I cannot bind the whole ETC to my NAS, same for the whole root?
The short syntax for specifying a volume mount is either:
- <volume_name>:<mountpoint>
Or:
- <source path>:<mountpoint>
The only way Docker can differentiate between a volume name and a path is whether or not the string includes a directory separator (/). Since you’re trying to do this:
evcc-config/evcc.yaml:/etc/evcc.yaml
Docker assumes you’re referring to a local filesystem path.
You’re looking for a subpath mount, which is supported in recent versions of Docker and Docker Compose. You need to use the long format for volume mounts, which permits you to set a subpath option.
The syntax would look like this:
services:
evcc:
command:
- evcc
image: evcc/evcc:latest
volumes:
- type: volume
source: evcc-config
target: /etc/evcc.yaml
volume:
nocopy: true
subpath: evcc.yaml
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