Trouble with setting evcc with docker and mounted volumes

[jaytonic]

Hi,

I'm setuping docker in a docker compose file.
The only non-standard thing is that I'm trying to mount all my path on my synology NAS through NFS.

I've the following config:

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:
      - type: volume
        source: evcc-config
        target: /etc/evcc.yaml
        volume:
          nocopy: true
          subpath: evcc.yaml
      - type: volume
        source: evcc-config
        target: /root/.evcc
        volume:
          nocopy: true
          subpath: .evcc

volumes:
  evcc-config:
    driver_opts:
      type: "nfs"
      o: "addr=192.168.0.60,nolock,rw,soft"
      device: ":/volume2/apps/config/evcc"

When I start, I get this info in the logs:

[main ] INFO 2024/09/19 19:26:48 evcc 0.130.11
[main ] INFO 2024/09/19 19:26:48 missing config file - switching into demo mode
[db ] INFO 2024/09/19 19:26:48 using sqlite database: /root/.evcc/evcc.db
[main ] INFO 2024/09/19 19:26:48 listening at :7070

But the mount seems to work, because the evcc.db has been properly initialized by evcc on my NAS. I must admit that I rarely mount directly files, and I'm not sure I've done this properly? I've also treid to configure the subpath to /evcc.yaml but same result.

[mdkeil]

your evcc.yaml is stored at the volumes path under /volume2/apps/config/evcc at your NAS?

[jaytonic]

Yes, exactly, at the same location, I'm finding the evcc.db file.

[coderph0x]

You cannot mount a directory to a file and to another directory.
You should mount the NFS share containing .evcc and evcc.yaml on OS level and bind mount those two into the container separately, and explicitly.

[jaytonic]

Hi,
I'm not totally sure what you mean sorry, I'm not (yet) an expert on docker.
I tried to create two different volume for the directory+file to mount, but I get the same exact result

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-data:/root/.evcc
      - type: volume
        source: evcc-config
        target: /etc/evcc.yaml
        volume:
          nocopy: true
          subpath: /evcc.yaml

volumes:
  evcc-config:
    driver_opts:
      type: "nfs"
      o: "addr=192.168.0.60,nolock,rw,soft"
      device: ":/volume2/apps/config/evcc/config"
  evcc-data:
    driver_opts:
      type: "nfs"
      o: "addr=192.168.0.60,nolock,rw,soft"
      device: ":/volume2/apps/config/evcc/data"

What would you change to my docker file then?

[coderph0x]

You're again mounting a directory to the yaml file inside the container. Since an nfs share cannot be only a file, this doesn't work well with nfs. Plus, you'd have two nfs shares (with overhead).
Mount the nfs share on the operating system and then bind mount from this folder into the container.

[jaytonic]

You're again mounting a directory to the yaml file inside the container. Since an nfs share cannot be only a file, this doesn't work well with nfs. Plus, you'd have two nfs shares (with overhead). Mount the nfs share on the operating system and then bind mount from this folder into the container.

I was not aware of this NFS limitation, that's a shame.
Yes I made 2 nfs share because I taught you meant that one share can only be mapped to a folder or a file, not both.

I would like to avoid mounting on the OS stuff, because the whole point is that when the servers crashes(it runs on a docker swarm with multiple small machines), I can just redeploy it if needed. Also, this might get executed on different machine when I deploy.

Is there a way to configure evcc config file path? Like this I could make a empty folder that I can mount over NFS?

[coderph0x]

Okay, I can understand the reasoning. You can define another config file with the -c (or long --config) switch, but I never tried if the docker image respects it if you place it in your compose file (or whatever you're using).
That way you could put the yaml file into the .evcc share and only mount that one.

Flags:
  -c, --config string   Config file (default "~/evcc.yaml" or "/etc/evcc.yaml")
  -h, --help            Help
      --ignore-db       Run command ignoring service database
  -l, --log string      Log level (fatal, error, warn, info, debug, trace) (default "info")
      --log-headers     Log headers
      --metrics         Expose metrics
      --profile         Expose pprof profiles
  -v, --version         version for evcc

[jaytonic]

So I modified my docker compose:

version: "3.9"

services:      
  evcc:
    command: ["evcc", "-c", "/root/.evcc/evcc.yaml"]
    image: evcc/evcc:latest
    ports:
      - 7070:7070/tcp
      - 8887:8887/tcp
      - 7090:7090/udp
      - 9522:9522/udp
    volumes:
      - evcc-config:/root/.evcc
          

volumes:
  evcc-config:
    driver_opts:
      type: "nfs"
      o: "addr=192.168.0.60,nolock,rw,soft"
      device: ":/volume2/apps/config/evcc"

I had to provide the command in the array format, but it seems to find the configuration file.

Now I've another error:

[main  ] FATAL 2024/09/21 09:46:56 failed configuring loadpoints: missing loadpoints
[main  ] FATAL 2024/09/21 09:46:56 will attempt restart in: 15m0s
[main  ] INFO 2024/09/21 09:46:56 listening at :7070
[db    ] INFO 2024/09/21 09:46:56 using sqlite database: /root/.evcc/evcc.db
[main  ] INFO 2024/09/21 09:46:56 using config file: /root/.evcc/evcc.yaml
[main  ] INFO 2024/09/21 09:46:56 evcc 0.130.11

So a few questions:

1. I'm right to interprete that this is now an error from evcc and not by the docker side?
2. I'm currently evaluating evcc, I don't have yet a car/charger, but I do have the solar PV, could this be the reason it fails? If yes, is there a way to put some kind of simulated car(like the demo mode but with my solar info) ?

my current evcc.yaml:

meters:
  - name: my_grid
    type: template
    template: enphase
    usage: grid
    host: 192.168.0.196 # IP address or hostname
    token: AAA

  - name: my_pv
    type: template
    template: enphase
    usage: pv
    host: 192.168.0.196 # IP address or hostname
    token: BBB

tariffs:
  currency: CHF
  grid:
    type: fixed
    price: 0.3252 # EUR/kWh (default)
    zones:
      - days: Mo-So
        hours: 21-7
        price: 0.2216 # EUR/kWh (weekdays 2-6 hours)

[GrimmiMeloni]

2. I don't have yet a car/charger, but I do have the solar PV, could this be the reason it fails? If yes, is there a way to put some kind of simulated car(like the demo mode but with my solar info) ?

Yes.
Yes. See https://github.com/evcc-io/evcc/blob/master/cmd/demo.yaml

[coderph0x]

Yes, docker works now and this is evcc complaining about missing loadpoints in the config.

[jaytonic]

Thanks that worked!