docker-stack.yml invalid volume type bind

Question

This is my docker-stack.yml file

    version: "3"

    services:
      mysql:
        image: mysql:latest
        deploy:
          replicas: 1
          update_config:
            parallelism: 1
          restart_policy:
            condition: on-failure
        ports:
          - "3306:3306"
        environment:
          MYSQL_ROOT_PASSWORD: <Censored>
          MYSQL_USER: <Censored>
          MYSQL_PASSWORD: <Censored>
        volumes:
          - ./db/data:/var/lib/mysql
          - ./db/logs:/var/log/mysql
          - ./db/config:/etc/mysql/conf.d
      php:
        image: wiput1999/php
        volumes:
          - ./web:/web
      nginx:
        image: nginx:latest
        ports:
          - "80:80"
          - "443:443"
        volumes:
          - ./code:/code:ro
          - ./site.conf:/etc/nginx/conf.d/default.conf
          - /etc/letsencrypt:/etc/letsencrypt
          - ./nginx/log:/var/log/nginx

When I run this following stack I got mysql and nginx with this error "invalid mount config for type "bind": bind source path does not exist"

I have no idea what wrong with my code.

Answer 1

bind is a type of mount that is used to mount a directory (or a file) on the host into the container. All of your volumes are set up like that. So one of your source directories (or files) do not exists on the host. Check each of these:

• ./db/data
• ./db/logs
• ./db/config
• ./web
• ./code
• ./site.conf
• /etc/letsencrypt
• ./nginx/log

You could execute ls -ld ./db/data ./db/logs ./db/config ./web ./code ./site.conf /etc/letsencrypt ./nginx/log >/dev/null and look at the error message to find out which one.

Answer 2

Please consider to use docker configs and docker secrets in place of volumes.

version: "3.3"

services:
  nginx:
    configs:
      - source: nginx_vhost
        target: /etc/nginx/conf.d/default.conf
    secrets:
      - ssl_private_key
...

configs:
  nginx_vhost:
    file: ./site.conf

secrets:
  ssl_private_key:
    file: /etc/letsencrypt/private.key

https://docs.docker.com/engine/swarm/configs/ and https://docs.docker.com/compose/compose-file/#configs