Dockerfiles

Starting a container, doing manual changes to it and committing into a new image is error-prone and does not scale for handling many images. In this post, I will show a powerful and more precise way of shaping new images.

This method uses a file called Dockerfile to control how new images are built. It is placed in a directory and consists of keyword-parameter lines. Let's take a look:

[root@r1745042 ~]# cat apache/Dockerfile
FROM rhel7-yum
RUN yum -y install httpd
COPY index.html /var/www/html/index.html