为什么不在Dockerfile中工作？ [英] why doesn't chown work in Dockerfile?

问题描述

我的Dockerfile创建一个目录，选择它，然后再列出目录。该目录仍由root拥有。为什么是这样？

这是Dockerfile：

  FROM ubuntu ：精确
 RUN useradd -d / home / testuser -m -s / bin / bash testuser 
运行mkdir -p / var / local / testrunner / logs 
 VOLUME [/ var / local / testrunner / logs] 
运行grep testuser / etc / passwd 
运行grep root / etc / passwd 
 RUN chown -R testuser：testuser / var / local / testrunner / logs 
 RUN ls -ld / var / local / testrunner / logs 
  

这里是docker build ：

 将构建上下文发送到Docker守护程序10.24 kB 
将构建上下文发送到Docker守护程序
步骤0 ：FROM ubuntu：precise 
 ---> ab8e2728644c 
步骤1：运行useradd -d / home / testuser -m -s / bin / bash testuser 
 --->使用缓存
 ---> 640f12671c86 
步骤2：运行mkdir -p / var / local / testrunner / logs 
 --->使用缓存
 ---> bf7756fd5b1f 
步骤3：VOLUME [/ var / local / testrunner / logs] 
 --->使用缓存
 ---> 65c73ee76c20 
步骤4：运行grep testuser / etc / passwd 
 --->使用缓存
 ---> db72fff0b965 
步骤5：运行grep root / etc / passwd 
 --->运行在ebff78df7a9a 
 root：x：0：0：root：/ root：/ bin / bash 
 ---> ead0ff704a59 
删除中间容器ebff78df7a9a 
步骤6：RUN chown -R testuser：testuser / var / local / testrunner / logs 
 --->运行在c925f67b2ab4 
 ---> 253132be935e 
删除中间容器c925f67b2ab4 
步骤7：运行ls -ld / var / local / testrunner / logs 
 --->运行在978bc66aa47e 
 drwxr-xr-x 2根员工4096 Oct 1 15:15 / var / local / testrunner / logs 
  

Docker版本1.2.0，构建fa7b24f

主机运行Ubuntu 12.04，但具有3.13.0-36通用内核。 / p>

解决方案

回答我自己的问题：它被声明为一个卷。如果您取出VOLUME指令，则chown将生效。

此外，如果您在运行chown后声明卷之后的批量设置仍然有效。

My Dockerfile creates a directory, chown's it, and then lists the directory afterwards. The directory is still owned by root. Why is that?

Here is the Dockerfile:

FROM ubuntu:precise
RUN useradd -d /home/testuser -m -s /bin/bash testuser
RUN mkdir -p /var/local/testrunner/logs
VOLUME ["/var/local/testrunner/logs"]
RUN grep testuser /etc/passwd
RUN grep root /etc/passwd
RUN chown -R testuser:testuser /var/local/testrunner/logs
RUN ls -ld /var/local/testrunner/logs 

Here is the output from "docker build":

Sending build context to Docker daemon 10.24 kB
Sending build context to Docker daemon 
Step 0 : FROM ubuntu:precise
 ---> ab8e2728644c
Step 1 : RUN useradd -d /home/testuser -m -s /bin/bash testuser
 ---> Using cache
 ---> 640f12671c86
Step 2 : RUN mkdir -p /var/local/testrunner/logs
 ---> Using cache
 ---> bf7756fd5b1f
Step 3 : VOLUME ["/var/local/testrunner/logs"]
 ---> Using cache
 ---> 65c73ee76c20
Step 4 : RUN grep testuser /etc/passwd
 ---> Using cache
 ---> db72fff0b965
Step 5 : RUN grep root /etc/passwd
 ---> Running in ebff78df7a9a
root:x:0:0:root:/root:/bin/bash
 ---> ead0ff704a59
Removing intermediate container ebff78df7a9a
Step 6 : RUN chown -R testuser:testuser /var/local/testrunner/logs
 ---> Running in c925f67b2ab4
 ---> 253132be935e
Removing intermediate container c925f67b2ab4
Step 7 : RUN ls -ld /var/local/testrunner/logs
 ---> Running in 978bc66aa47e
drwxr-xr-x 2 root staff 4096 Oct  1 15:15 /var/local/testrunner/logs

Docker version 1.2.0, build fa7b24f

The host runs Ubuntu 12.04, but with a 3.13.0-36-generic kernel.

解决方案

Answering my own question: it's declared to be a volume. If you take out the VOLUME instruction, the chown takes effect.

What's more, if you declare the volume after running chown, the chown settings remain in effect.

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