如何将多行附加到dockerfile中的文件？

Question

我有一个dockerfile，似乎无法将nginx配置文件嵌入到它中，因此它可以附加到/etc/nginx/nginx.conf。

我尝试了以下格式：

RUN cat <<EOT >> /etc/nginx/nginx.conf
user                            www;
worker_processes                auto; # it will be determinate automatically by the number of core

error_log                       /var/log/nginx/error.log warn;
pid                             /var/run/nginx.pid; # it permit you to use /etc/init.d/nginx reload|restart|stop|start

events {
    worker_connections          1024;
}

http {
    include                     /etc/nginx/mime.types;
    default_type                application/octet-stream;
    sendfile                    on;
    access_log                  /var/log/nginx/access.log;
    keepalive_timeout           3000;
    server {
        listen                  80;
        root                    /usr/local/www;
        index                   index.html index.htm;
        server_name             localhost;
        client_max_body_size    32m;
        error_page              500 502 503 504  /50x.html;
        location = /50x.html {
              root              /var/lib/nginx/html;
        }
    }
}
EOT

和

RUN echo $
'user                            www; \n
worker_processes                auto; # it will be determinate automatically by the number of core \n

error_log                       /var/log/nginx/error.log warn; \n
pid                             /var/run/nginx.pid; # it permit you to use /etc/init.d/nginx reload|restart|stop|start \n

events { \n
    worker_connections          1024; \n
} \n

http { \n
    include                     /etc/nginx/mime.types; \n
    default_type                application/octet-stream; \n
    sendfile                    on; \n
    access_log                  /var/log/nginx/access.log; \n
    keepalive_timeout           3000; \n
    server { \n
        listen                  80; \n
        root                    /usr/local/www; \n
        index                   index.html index.htm; \n
        server_name             localhost; \n
        client_max_body_size    32m; \n
        error_page              500 502 503 504  /50x.html; \n
        location = /50x.html { \n
              root              /var/lib/nginx/html; \n
        } \n
    } \n
}' 
> /etc/nginx/nginx.conf

但是，无论是两个示例中的任何一个，我都会收到以下错误，有点看起来像docker试图将nginx配置文件视为自己的变量：

Sending build context to Docker daemon 33.28 kB
Error response from daemon: Unknown instruction: WORKER_PROCESSES

Docker版本是1.13.1，构建07f3374 / 1.13.1，我使用的发行版是CentOS Atomic Host 7.1902，而docker基础图像是alpinelinux。

谢谢

Answer 1

这应该够了吧：

RUN echo $'first line \n\
second line \n\
third line' > /etc/nginx/nginx.conf

基本上它包裹在$''并使用\n\为新线。