bash – Docker中的Logstash – 通过卷挂载时找不到配置文件

我正在尝试在Docker容器中启动logstash但是当我将配置文件作为卷挂载时,它似乎找不到它.有趣的是,如果我用bash启动容器,我可以在那里看到配置文件并运行与docker相同的命令,它可以工作.

Docker文件

FROM ubuntu:14.04
MAINTAINER cvallance

RUN apt-get update
RUN apt-get -yqq install openjdk-7-jre
RUN apt-get -yqq install curl
RUN mkdir /opt/logstash 
  && cd /opt/logstash 
  && curl -O https://download.elastic.co/logstash/logstash/logstash-1.4.2.tar.gz 
  && tar zxvf logstash-1.4.2.tar.gz

CMD ["/opt/logstash/logstash-1.4.2/bin/logstash","agent","--verbose","-f","/etc/logstash/sample.conf"]

位于$(pwd)/config/sample.conf的配置文件

input {
  stdin { }
}

output {
  stdout {
    codec => rubydebug
  }
}

Docker构建命令：

docker build -t cvallance/logstash .

Docker运行命令：

docker run -ti -v $(pwd)/config:/etc/logstash cvallance/logstash

错误：

Error: No config files found:  /etc/logstash/sample.conf
Can you make sure this path is a logstash config file?

但是,如果我从bash会话中运行相同的命令,就像这样…

docker run -ti -v $(pwd)/config:/etc/logstash cvallance/logstash bash
...
root@d3fd885903dd:/# /opt/logstash/logstash-1.4.2/bin/logstash agent --verbose -f /etc/logstash/sample.conf

一切都按预期工作.即输入和输出

testing
{
       "message" => "testing","@version" => "1","@timestamp" => "2015-04-10T00:06:33.878Z","host" => "d3fd885903dd"
}