Dockerfile can't copy files. ("cp" command)

Question

My Dockerfile contains some `cp` linux commands. Because some files in project are decalred as sample such as `xxx.php.sample`, and it should be replaced as `xxx.php`. I thought this process should be executed on `Dockerfile`. So i wrote like this. Dockerfile-php-apache ``` FROM php:5.5-apache RUN apt-get update && \ docker-php-ext-install pdo_mysql mysqli mbstring RUN a2enmod rewrite RUN a2enmod substitute ADD . /var/www WORKDIR /var/www RUN cp config.php.sample config.php RUN cp shared_config.php.sample shared_config.php RUN cp vendor/propel/propel1/build.properties.sample vendor/propel/propel1/build.properties RUN sed -i -E "s/host=(.*);/host=mysql-db;/" ./vendor/propel/propel1/build.properties COPY docker-php-apache/php.ini /usr/local/etc/php/ ``` docker-compose.yml ``` version: '2' services: mysql-db: build: context: . dockerfile: Dockerfile-mysql-server ports: - "3306:3306" php-apache: build: context: . dockerfile: Dockerfile-php-apache volumes: - .:/var/www ports: - "80:80" dep…

Accepted Answer

Approach #1 I believe that the below statements of the `Dockerfile` can be changed From:

```
ADD . /var/www
WORKDIR /var/www
RUN cp config.php.sample config.php
RUN cp shared_config.php.sample shared_config.php
RUN cp vendor/propel/propel1/build.properties.sample vendor/propel/propel1/build.properties
```

To:

```
ADD config.php.sample /var/www/config.php
ADD shared_config.php.sample /var/www/shared_config.php
ADD vendor/propel/propel1/build.properties.sample /var/www/vendor/propel/propel1/build.properties 
```

Of course, you also use `COPY` instead of `ADD` as well in the above.

Approach #2 Change below statements from:

```
RUN cp config.php.sample config.php
RUN cp shared_config.php.sample shared_config.php
RUN cp vendor/propel/propel1/build.properties.sample vendor/propel/propel1/build.properties
```

To:

```
RUN ["cp",  "config.php.sample", "config.php"]
RUN ["cp", "shared_config.php.sample", "shared_config.php"]
RUN ["cp", "vendor/propel/propel1/build.properties.sample", "vendor/propel/propel1/build.properties"]
```

For more details, refer documentation.

Hope this is helpful.

Dockerfile can't copy files. ("cp" command)

Solution

Problem