Before building a new custom FEP Server container image, it is important to understand several build instructions specific to that image.

• FEP server container image is built on top of UBI8/UBI9 minimal image, ubi-minimal

• USER is default to 26

UBI8/UBI9 minimal image uses microdnf as package manager. Microdnf does not support installing RPM packages from remote URL or local file, only from a YUM repository. If you want to install RPM package that is not in YUM repository, first download the package and install it with rpm. However, rpm has the drawback that it does not resolve dependencies. The only way to resolve this problem is to install dnf first and use dnf to install packages from remote URL or local file.

As USER is default to 26, it does not have the permission to install RPM packages or write files to system directory such as /usr/bin, /usr/local/bin, etc. To workaround this issue, first set USER to root to continue the customization and set it back to 26.

FROM: quay.io/fujitsu/fujitsu-enterprise-postgres-18-server:ubi9-18-1.0

USER root

RUN …(customization)

USER 26