Ruby-on-rails 无法提供 Docker Rails 应用程序 - curl: (56) Recv failure: Connection reset by peer
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Docker Rails app fails to be served - curl: (56) Recv failure: Connection reset by peer
提问by Luca G. Soave
I build a Rails app container with the following Dockerfile:
我使用以下 Dockerfile 构建了一个 Rails 应用程序容器：
$ cat Dockerfile
FROM ruby:2.2
MAINTAINER Luca G. Soave <[email protected]>
RUN apt-get update && apt-get install -y nodejs --no-install-recommends && rm -rf /var/lib/apt/lists/*
RUN apt-get update && apt-get install -y mysql-client postgresql-client sqlite3 --no-install-recommends && rm -rf /var/lib/apt/lists/*
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY . /usr/src/app/
RUN bundle install
EXPOSE 3000
CMD ["rails", "server"]
the build succeed:
构建成功：
$ docker build -t querier .
Sending build context to Docker daemon 46.75 MB
Sending build context to Docker daemon
...
Step 10 : CMD rails server
---> Running in 8eb62f8a579a
---> 65eee929d518
Removing intermediate container 8eb62f8a579a
Successfully built 65eee929d518
the container is running:
容器正在运行：
$ docker logs -f 89ff3bb8c584
=> Booting WEBrick
=> Rails 4.2.0 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
[2015-01-06 19:56:56] INFO WEBrick 1.3.1
[2015-01-06 19:56:56] INFO ruby 2.2.0 (2014-12-25) [x86_64-linux]
[2015-01-06 19:56:56] INFO WEBrick::HTTPServer#start: pid=1 port=3000
and it's exporting 3000/tcp port:
它正在导出 3000/tcp 端口：
$ docker ps -al
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
89ff3bb8c584 querier:latest "rails server" 16 minutes ago Up 16 minutes 0.0.0.0:3000->3000/tcp gloomy_babbage
but the server is not reachable 'internally' or 'externally' Docker:
但是服务器无法“内部”或“外部”访问 Docker：
$ curl 0.0.0.0:3000
curl: (56) Recv failure: Connection reset by peer
$ curl 172.17.0.24:3000
curl: (7) Failed to connect to 172.17.0.24 port 3000: Connection refused
but everything seems ok:
但一切似乎都很好：
$ docker inspect --format '{{ .NetworkSettings.IPAddress }}' 89ff3bb8c584
172.17.0.24
$ netstat -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
default 10.36.32.1 0.0.0.0 UG 0 0 0 wlan0
10.0.3.0 * 255.255.255.0 U 0 0 0 lxcbr0
10.36.32.0 * 255.255.248.0 U 0 0 0 wlan0
172.17.0.0 * 255.255.0.0 U 0 0 0 docker0
$ ping 0.0.0.0
PING 0.0.0.0 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.069 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.061 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.069 ms
^C
--- 0.0.0.0 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1998ms
rtt min/avg/max/mdev = 0.061/0.066/0.069/0.007 ms
$ ping 172.17.0.24
PING 172.17.0.24 (172.17.0.24) 56(84) bytes of data.
64 bytes from 172.17.0.24: icmp_seq=1 ttl=64 time=0.085 ms
64 bytes from 172.17.0.24: icmp_seq=2 ttl=64 time=0.107 ms
64 bytes from 172.17.0.24: icmp_seq=3 ttl=64 time=0.076 ms
^C
I tried also in the browser but nothing. The host sistem is:
我也在浏览器中尝试过，但没有。主机系统是：
$ docker -v
Docker version 1.4.1, build 5bc2ff8
$ uname -a
Linux basenode 3.11.0-18-generic #32-Ubuntu SMP Tue Feb 18 21:11:14 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
Any idea?
任何的想法？
回答by Mykola Gurov
Rails server documentationstates that the server by default binds to localhost, and this usually prevents dockerized application to accept connections. Try changing it to 0.0.0.0.
Rails 服务器文档说明服务器默认绑定到localhost，这通常会阻止 dockerized 应用程序接受连接。尝试将其更改为0.0.0.0.
回答by Luca G. Soave
I just flagged Mykola Gurov answer because is the right 'cause' of my issue, anyway I'd also like to add the solution I implemented to work around that cause, just for tracking pourpose.
我只是标记了 Mykola Gurov 的答案，因为这是我的问题的正确“原因”，无论如何，我还想添加我为解决该原因而实施的解决方案，仅用于跟踪浇注。
I modified config/boot.rb by adding default option:
我通过添加默认选项修改了 config/boot.rb：
$ cat config/boot.rb
# Set up gems listed in the Gemfile.
ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
require 'bundler/setup' if File.exists?(ENV['BUNDLE_GEMFILE'])
######## added lines ########
require 'rails/commands/server'
module Rails
class Server
alias :default_options_alias :default_options
def default_options
default_options_alias.merge!(:Host => '0.0.0.0')
end
end
end
###############################
If you don't want modify config/boot.rb, another solution could be forcing Dockerfile to bind 0.0.0.0 host as an ENTRYPOINT/CMD parameter:
如果您不想修改 config/boot.rb，另一种解决方案可能是强制 Dockerfile 将 0.0.0.0 主机绑定为 ENTRYPOINT/CMD 参数：
$ cat Dockerfile
FROM ruby:2.2
RUN apt-get update && apt-get install -y nodejs --no-install-recommends && rm -rf /var/lib/apt/lists/*
RUN apt-get update && apt-get install -y mysql-client postgresql-client sqlite3 --no-install-recommends && rm -rf /var/lib/apt/lists/*
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
COPY . /usr/src/app/
RUN bundle install
EXPOSE 3000
ENTRYPOINT ["rails", "server", "-b", "0.0.0.0"]
