7.7. Building UBI-based images

Procedure

1. Create a Containerfile:

   FROM registry.access.redhat.com/ubi10/ubi
   USER root
   LABEL maintainer="John Doe"
   # Update image
   RUN dnf update --disablerepo=* --enablerepo=ubi-10-appstream-rpms --enablerepo=ubi-10-baseos-rpms -y && rm -rf /var/cache/yum
   RUN dnf install --disablerepo=* --enablerepo=ubi-10-appstream-rpms --enablerepo=ubi-10-baseos-rpms httpd -y && rm -rf /var/cache/yum
   # Add default Web page and expose port
   RUN echo "The Web Server is Running" > /var/www/html/index.html
   EXPOSE 80
   # Start the service
   CMD ["-D", "FOREGROUND"]
   ENTRYPOINT ["/usr/sbin/httpd"]

2. Build the container image:

   # buildah bud -t johndoe/webserver .
   STEP 1: FROM registry.access.redhat.com/ubi10/ubi:latest
   STEP 2: USER root
   STEP 3: LABEL maintainer="John Doe"
   STEP 4: RUN dnf update --disablerepo=* --enablerepo=ubi-10-appstream-rpms --enablerepo=ubi-10-baseos-rpms -y
   ...
   Writing manifest to image destination
   Storing signatures
   --> f9874f27050
   f9874f270500c255b950e751e53d37c6f8f6dba13425d42f30c2a8ef26b769f2

Verification

1. Run the web server:

   # podman run -d --name=myweb -p 80:80 johndoe/webserver
   bbe98c71d18720d966e4567949888dc4fb86eec7d304e785d5177168a5965f64

2. Test the web server:

   # curl http://localhost/index.html
   The Web Server is Running