错误描述

我无法在Vagrant或Docker中挂载文件，所以这似乎是由某种权限错误引起的问题。

我的操作系统是 Ubuntu 18.04 LTS (Bionic Beaver) ，据我所知，我没有运行任何像 SELinux 这样的访问控制模块。

与Vagrant相关的错误讨论可以在另一个问题中找到： Unable to mount files in Vagrant

Docker故障排除

我无法使用docker-compose将文件挂载到Docker容器中，我正在尝试构建： https://github.com/fredrikaverpil/saltstack-docker

我将 docker-compose 文件中的卷设置为：

volumes:
  - ${PWD}/assets/master/etc/supervisor:/etc/supervisor
  - ${PWD}/assets/master/etc/salt:/etc/salt
  - ${PWD}/assets/master/var/cache/salt:/var/cache/salt
  - ${PWD}/assets/master/var/log/salt:/var/log/salt
  - ${PWD}/assets/master/srv:/srv

然而，我在运行 docker-compose up 时得到了以下输出

Creating network "saltstack_default" with the default driver
Creating salt_image
Creating salt
Creating minion
Attaching to salt, minion, salt_image
salt      | Error: could not find config file /etc/supervisor/supervisord.conf
salt      | For help, use /usr/bin/supervisord -h
salt exited with code 2
salt_image exited with code 0
minion    | [ERROR   ] DNS lookup of 'salt' failed.
minion    | [ERROR   ] Master hostname: 'salt' not found. Retrying in 30 seconds

对容器执行 docker inspect 命令会显示正确的配置：

   "Mounts": [
            "Type": "bind",
            "Source": "/somedir/saltstack/assets/master/etc/salt",
            "Destination": "/etc/salt",
            "Mode": "rw",
            "RW": true,
            "Propagation": "rprivate"
            "Type": "bind",
            "Source": "/somedir/saltstack/assets/master/var/cache/salt",
            "Destination": "/var/cache/salt",
            "Mode": "rw",
            "RW": true,
            "Propagation": "rprivate"
            "Type": "bind",
            "Source": "/somedir/saltstack/assets/master/etc/supervisor",
            "Destination": "/etc/supervisor",
            "Mode": "rw",
            "RW": true,
            "Propagation": "rprivate"
            "Type": "bind",
            "Source": "/somedir/saltstack/assets/master/var/log/salt",
            "Destination": "/var/log/salt",
            "Mode": "rw",
            "RW": true,
            "Propagation": "rprivate"
            "Type": "bind",
            "Source": "/somedir/saltstack/assets/master/srv",
            "Destination": "/srv",
            "Mode": "rw",
            "RW": true,
            "Propagation": "rprivate"
        }

但是进入容器(使用另一个入口点命令)，会显示应该挂载的文件丢失：

[root@salt /]# ll /etc/supervisor
total 0
[root@salt /]# ll /etc/salt
total 0
[root@salt /]# ll /var/cache/salt
total 0
[root@salt /]# ll /var/log/salt
total 0
[root@salt /]# ll /srv
total 0

结论

当涉及到复制文件时，我的本地计算机上似乎出现了一些非常混乱的情况，可能与我的用户如何配置以及它有权将文件挂载到虚拟机和容器中有关。

如果有人能对此有所了解，我将不胜感激。

更新

更新1

我怀疑这是我将要删除的 /var/lib/docker 中的旧东西的问题，但在此之前，我收到了另一个错误，可能是某种权限错误：

> cat docker-compose.yml 
# based on https://docs.docker.com/samples/library/nginx/#using-environment-variables-in-nginx-configuration
version: '2'
services:
    image: nginx
    volumes:
     - ./testfile.txt:/etc/nginx/
    ports:
     - "8080:80"
    environment:
     - NGINX_HOST=foobar.com
     - NGINX_PORT=80
    command: /bin/bash -c "nginx -g 'daemon off;'"
> docker-compose up
Creating network "docker_compose-mounting_issue_default" with the default driver