Commits on Apr 2, 2021

1. refactor system boot sequence …

   The current systemd boot sequence is error prone on isolated scenarios
   like sending invalid configurations through user data. These scenarios
   could cause inconsistent states at the end of the boot process, which
   affect the mechanism to determine if a boot was successful after
   applying new configurations or updates. It is also difficult to
   implement features that require service initialization order.
   
   In order to fix the problems presented above, this commit defines a new
   boot sequence, with three main systemd targets: preconfigured, configured
   and multi-user.
   
   Preconfigured
   
   This target is used to start the boot process. Failures in any of the
   required service units will cause the target to fail, stopping the boot
   process. The boot is marked as successful during the execution of this
   target only if the migrator "oneshot" service exists successfully.
   Services initialized during this phase include:
   
   * migrator
   * mark-successful-boot
   * send-boot-success
   * storewolf
   * apiserver
   * early-boot-config
   * sundog
   * settings-applier
   
   Once the target is reached (completed), the "activate-configured.service"
   unit will set the configured target as the default target and start it.
   
   Configured
   
   This target should be used to setup additional configurations in the
   host before services like kubernetes/ecs start. Services initialized
   during this phase include:
   
   * chronyd
   * host-containerd
   
   Once the target is reached (completed) the "activate-multi-user.service"
   unit will set the multi-user target as the default target, and start it.
   
   Multi-user
   
   This is the final target enabled in the boot sequence. Services
   initialized during this phase include:
   
   * host-containers@*
   * docker
   * ecs
   * kubernetes

   

   arnaldo2792 committed Apr 2, 2021
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