docker - Dockerfile无效

Question

我从Docker开始遇到了一个问题。我想在一个Apache容器中启用mod_rewrite并正在使用此docker-compose.yml

version: '3'
services:
  php-apache:
    image: php:7.2.1-apache
    ports:
      - 80:80
    volumes:
      - ./DocumentRoot:/var/www/html:z

这个Dockerfile:

FROM php:7.2.1-apache
RUN a2enmod rewrite
RUN service apache2 restart

我运行“docker build --no-cache”。输出:

Sending build context to Docker daemon  90.16MB
Step 1/3 : FROM php:7.2.1-apache
 ---> f99d319c7004
Step 2/3 : RUN a2enmod rewrite
 ---> Running in 883573f39a39
Enabling module rewrite.
To activate the new configuration, you need to run:
  service apache2 restart
Removing intermediate container 883573f39a39
 ---> 18c40ce865a6
Step 3/3 : RUN service apache2 restart
 ---> Running in b79bab530dc7
Restarting Apache httpd web server: apache2AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.17.0.2. Set the 'ServerName' directive globally to suppress this message
.
Removing intermediate container b79bab530dc7
 ---> 8e2cfa7094f7
Successfully built 8e2cfa7094f7

结果:未安装mod_rewrite。当我登录到控制台并手动运行“a2enmod rewrite”时，一切正常。我在这里想念什么？

Answer 1

docker build --no-cache .创建docker镜像<none>:<none>。
您的撰写文件引用了基本image: php:7.2.1-apache。基本上，您正在准备不使用的图像。
您可能需要使用-t参数来标记要构建的图像，然后在撰写文件中引用该图像。例如:

docker build -t my-awesome-php-with-a2enmod --no-cache .

version: '3'
services:
  php-apache:
    image: my-awesome-php-with-a2enmod
    ports:
      - 80:80
    volumes:
      - ./DocumentRoot:/var/www/html:z