为什么docker容器会立即退出 [英] Why docker container exits immediately

问题描述

我使用

 docker run -d --name hadoop h_Service

它很快退出.但是如果我在前台运行，它工作正常.我使用

it exits quickly. But if I run in the foreground, it works fine. I checked logs using

docker logs hadoop

没有错误.有什么想法吗?

there was no error. Any ideas?

DOCKERFILE

 FROM java_ubuntu_new
 RUN wget http://archive.cloudera.com/cdh4/one-click-install/precise/amd64/cdh4-repository_1.0_all.deb
 RUN dpkg -i cdh4-repository_1.0_all.deb
 RUN curl -s http://archive.cloudera.com/cdh4/ubuntu/precise/amd64/cdh/archive.key | apt-key add -
 RUN  apt-get update
 RUN apt-get install -y hadoop-0.20-conf-pseudo
 RUN dpkg -L hadoop-0.20-conf-pseudo
 USER hdfs
 RUN hdfs namenode -format
 USER root
 RUN apt-get install -y sudo
 ADD . /usr/local/
 RUN chmod 777 /usr/local/start-all.sh
 CMD ["/usr/local/start-all.sh"]

start-all.sh

start-all.sh

 #!/usr/bin/env bash
 /etc/init.d/hadoop-hdfs-namenode start
 /etc/init.d/hadoop-hdfs-datanode start
 /etc/init.d/hadoop-hdfs-secondarynamenode start
 /etc/init.d/hadoop-0.20-mapreduce-tasktracker start
 sudo -u hdfs hadoop fs -chmod 777 /
 /etc/init.d/hadoop-0.20-mapreduce-jobtracker start
 /bin/bash

推荐答案

Docker 容器在其主进程完成时退出.

A docker container exits when its main process finishes.

在这种情况下，它会在您的 start-all.sh 脚本结束时退出.我对 hadoop 了解得不够多，无法告诉您在这种情况下如何执行此操作，但是您需要让某些程序在前台运行，或者使用诸如 runit 或 supervisord 之类的进程管理器来运行这些进程.

In this case it will exit when your start-all.sh script ends. I don't know enough about hadoop to tell you how to do it in this case, but you need to either leave something running in the foreground or use a process manager such as runit or supervisord to run the processes.

如果你不指定-d，我认为你一定误会了它的工作原理；它应该具有完全相同的效果.我怀疑你使用稍微不同的命令或使用 -it 启动它，这会改变事情.

I think you must be mistaken about it working if you don't specify -d; it should have exactly the same effect. I suspect you launched it with a slightly different command or using -it which will change things.

一个简单的解决方案可能是添加如下内容:

A simple solution may be to add something like:

虽然为真；睡1000；完毕

到脚本的结尾.然而，我不喜欢这样，因为脚本应该真正监控它启动的进程.

to the end of the script. I don't like this however, as the script should really be monitoring the processes it kicked off.

(我应该说我从 https://github.com/sequenceiq/窃取了该代码hadoop-docker/blob/master/bootstrap.sh)

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