docker-compose 图像卷

Question

我正在使用 docker-machine、Mac OS X、驱动程序 digitalocean 和默认 virtualbox。

Dockerfile：

FROM ruby:2.2.0
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev
RUN mkdir /myapp-web-api
WORKDIR /myapp-web-api
ADD Gemfile /myapp-web-api/Gemfile
ADD Gemfile.lock /myapp-web-api/Gemfile.lock
RUN bundle install
ADD . /myapp-web-api

docker-compose.yml:

db:
  image: postgres
  ports:
    - "5432:5432"
web:
  build: .
  command: rails s -p 3000 -b '0.0.0.0'
  volumes:
    - .:/myapp-web-api
  ports:
    - "3000:3000"
  links:
    - db

当我使用本地虚拟盒驱动程序卷映射时很好。但是当我将 env 切换到 digitalocean 时，图像开始出现一些问题。

docker-compose 构建没问题

Boriss-MacBook-myapp-web-api wwtlf$ docker-compose ps
Name                    Command               State    Ports 
------------------------------------------------------------------
myappwebapi_db_1    /docker-entrypoint.sh postgres   Exit 0         
myappwebapi_web_1   rails s -p 3000 -b 0.0.0.0       Exit 1         
Boriss-MacBook-myapp-web-api wwtlf$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
myappwebapi_web      latest              4c95e37708ff        22 minutes ago      927 MB
postgres            latest              b305a133422a        13 days ago         265.1 MB
ruby                2.2.0               ac90cee00759        10 months ago       774.7 MB
Boriss-MacBook-Pro:myapp-web-api wwtlf$ 

当我尝试启动容器时：

Boriss-MacBook-Pro:myapp-web-api wwtlf$ docker-compose up
Starting myappwebapi_db_1
Starting myappwebapi_web_1
Attaching to myappwebapi_db_1, myappwebapi_web_1
db_1  | LOG:  database system was shut down at 2015-12-19 07:34:21 UTC
db_1  | LOG:  MultiXact member wraparound protections are now enabled
db_1  | LOG:  database system is ready to accept connections
db_1  | LOG:  autovacuum launcher started
web_1 | /usr/local/bundle/gems/bundler-1.7.12/lib/bundler/definition.rb:22:in `build': /myapp-web-api/Gemfile not found (Bundler::GemfileNotFound)
web_1 |     from /usr/local/bundle/gems/bundler-1.7.12/lib/bundler.rb:155:in `definition'
web_1 |     from /usr/local/bundle/gems/bundler-1.7.12/lib/bundler.rb:118:in `setup'
web_1 |     from /usr/local/bundle/gems/bundler-1.7.12/lib/bundler/setup.rb:17:in `<top (required)>'
web_1 |     from /usr/local/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:128:in `require'
web_1 |     from /usr/local/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:128:in `rescue in require'
web_1 |     from /usr/local/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:39:in `require'
web_1 |     from /usr/local/bundle/bin/rails:14:in `<main>'
myappwebapi_web_1 exited with code 1

嗯，让我们检查一下音量：

docker-compose run web /bin/bash
Starting myappwebapi_db_1
root@155e09fc57ac:/myapp-web-api# ls
root@155e09fc57ac:/myapp-web-api# 

空:( 让我们尝试另一种方式：

Boriss-MacBook-Pro:myapp-web-api wwtlf$ docker run -i -t myappwebapi_web /bin/bash
root@ee53fea29f97:/myapp-web-api# ls
Dockerfile  Gemfile  Gemfile.lock  README.rdoc  Rakefile  app  bin  config  config.ru  db  docker-compose.yml  lib  log  public  test  tmp  vendor
root@ee53fea29f97:/myapp-web-api# 

docker-compose run 和 docker run 有什么区别？？？

看起来我连接到不同图像的线...

更新：

我发现 docker-compose 运行 web /bin/bash 文件夹 /myapp-web-api 已映射到 digitalocean VM 上的 root@myapp-prod:/Users/wwtlf/Projects/MYAPP/myapp-web-api 文件夹，但是不接待。

Answer 1

docker-compose run和docker run有什么区别？？？

不同之处在于 docker-compose.yml 文件的卷部分：

volumes:
    - .:/myapp-web-api

此命令将主机目录 . 挂载到位于 /myapp-web-api 的容器中。
如果路径 /myapp-web-api 已存在于容器映像中，则 ./ 挂载会覆盖但不会不删除预先存在的内容。

docker-compose up 命令临时覆盖 Dockerfile ADD 指令中指定的 /myapp-web-api 的内容。

docker run -i -t myappwebapi_web /bin/bash 命令不是这种情况，它不会挂载任何主机文件夹。