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2.4. Understanding the UBI init images

The UBI init images, named ubi-init, contain the systemd initialization system, making them useful for building images in which you want to run systemd services, such as a web server or file server. The init image contains more content than minimal images but less than standard images.

Because the ubi10-init image builds on top of the ubi10 image, their contents are mostly the same. However, there are a few critical differences:

  • ubi10-init:

    • CMD is set to /sbin/init to start the systemd Init service by default
    • includes ps and process related commands (procps-ng package)
    • sets SIGRTMIN+3 as the StopSignal, as systemd in ubi10-init ignores normal signals to exit (SIGTERM and SIGKILL), but will terminate if it receives SIGRTMIN+3

  • ubi10:

    • CMD is set to /bin/bash
    • does not include ps and process related commands (procps-ng package)
    • does not ignore normal signals to exit (SIGTERM and SIGKILL)
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