Dockerfile COPY： “lchown ......不是一个目录”

Question

试图建立这个Dockerfile：

FROM dockerfile/ubuntu 

RUN apt-get update && apt-get install -y apache2 

COPY proxypass.conf /etc/apache2/sites-available 
COPY caching.conf /etc/apache2/conf-available 
RUN a2ensite proxypass \ 
    && a2enconf caching \ 
    && a2disconf serve-cgi-bin 

EXPOSE 80 

CMD ["/usr/sbin/apache2ctl", "-D", "FOREGROUND"] 

的proxypass.conf和caching.conf文件位于apache目录与Dockerfile一起。

运行docker build给出了这样的输出：

$ sudo docker build -t me/apache apache 
Sending build context to Docker daemon 29.7 kB 
Sending build context to Docker daemon 
Step 0 : FROM dockerfile/ubuntu 
---> 77f8745ed183 
Step 1 : RUN apt-get update && apt-get install -y apache2 
---> Using cache 
---> d62d92d91591 
Step 2 : COPY proxypass.conf /etc/apache2/sites-available 
2014/10/16 09:02:32 lchown /u01/docker/devicemapper/mnt/38bcd5cca695b4e9ac9af77e0342f85dea9fb10a238f7bd5173289bb956cf5c8/rootfs/etc/apache2/sites-available/proxypass.conf: not a directory 

这是Oracle的Linux 6.5（基本的CentOS 6.5）。

$ sudo docker info 
Containers: 1 
Images: 113 
Storage Driver: devicemapper 
Pool Name: docker-8:2-1308404-pool 
Data file: /u01/docker/devicemapper/devicemapper/data 
Metadata file: /u01/docker/devicemapper/devicemapper/metadata 
Data Space Used: 4307.1 Mb 
Data Space Total: 102400.0 Mb 
Metadata Space Used: 5.5 Mb 
Metadata Space Total: 2048.0 Mb 
Execution Driver: native-0.2 
Kernel Version: 2.6.32-358.23.2.el6.x86_64 
Username: kgutwin 
Registry: [https://index.docker.io/v1/] 

Answer 1

为Dockerfile COPY指令的文件说：

如果<DEST>不以斜线结尾，将被视为普通文件和<SRC>的内容将是写在。

所以只需添加的目标目录一个/，你将能够建立你的形象：

COPY proxypass.conf /etc/apache2/sites-available/ 
COPY caching.conf /etc/apache2/conf-available/