Issue mounting docker volume with docker-compose

问题:

My Scenario

I am trying to build docker swarm with docker-compose.yml file

version: '3'

services:
  myapp-nginx:
    image: nginx:1.10
    volumes:
     - ./nginx/certs:/etc/nginx/certs
    ports:
      - 80:80
      - 443:443

using build command as below

$ docker stack deploy --compose-file docker-compose.yml myapp

Creating network myapp_default
Creating service myapp_myapp-nginx

My system have Docker Version 17.03.1-ce-mac5 (16048)

Problem

Volumes mounts are not working, If I comment out volumes: - ./nginx/certs:/etc/nginx/certs then everything works fine.

Otherwise nginx doesn't work at all, I see

CAGTAM1059934:docker iskumar$ docker stack ps myapp
ID            NAME                  IMAGE       NODE      DESIRED STATE  CURRENT STATE            ERROR                             PORTS
efjia8b7y6jd  myapp_myapp-nginx.1      nginx:1.10  manager1  Ready          Rejected 5 seconds ago   "invalid mount config for type…"  
c9c6ogh11osi   \_ myapp_myapp-nginx.1  nginx:1.10  worker2   Shutdown       Rejected 10 seconds ago  "invalid mount config for type…"  
iveikxpnbq6x   \_ myapp_myapp-nginx.1  nginx:1.10  worker1   Shutdown       Rejected 15 seconds ago  "invalid mount config for type…"  

Is there any special way to mount volumes in docker-compose v3?

回答1:

You must use absolute paths when mounting volumes, also with docker run.

$ docker run --rm -it -v ./eos:/eos:ro ubuntu 
docker: Error response from daemon: create ./eos: "./eos" includes invalid characters for a local volume name, only "[a-zA-Z0-9][a-zA-Z0-9_.-]" are allowed. If you intented to pass a host directory, use absolute path.
See 'docker run --help'

回答2:

I was running docker stack deploy from my macbook instead on boot2docker VMs. Which is why system couldn't find those network mount source, even though I had manager1 activated using eval $(docker-machine env manager1)

First I used --no-trunc argument to view full error message.

$> docker node ps --no-trunc
---
Showed "invalid mount config for type "bind": bind source path does not exist"  
---

After that copies the files from host system (My MacBook) to VM and launching stack worked fine.

Credit to https://github.com/docker/docker/issues/31202#issuecomment-281312704