DRACUT.BOOTUP(7)

NAME
dracut.bootup - boot ordering in the initramfs

DESCRIPTION

This flow chart illustrates the ordering of the services, if systemd is used in the dracut initramfs.

                                        systemd-journal.socket
                                                   |
                                                   v
                                        dracut-cmdline.service
                                                   |
                                                   v
                                        dracut-pre-udev.service
                                                   |
                                                   v
                                         systemd-udevd.service
                                                   |
                                                   v
    local-fs-pre.target                dracut-pre-trigger.service
             |                                     |
             v                                     v
     (various mounts)  (various swap  systemd-udev-trigger.service
             |           devices...)               |             (various low-level   (various low-level
             |               |                     |             services: seed,       API VFS mounts:
             v               v                     v             tmpfiles, random     mqueue, configfs,
      local-fs.target   swap.target     dracut-initqueue.service    sysctl, ...)        debugfs, ...)
             |               |                     |                    |                    |
             \_______________|____________________ | ___________________|____________________/
                                                  \|/
                                                   v
                                            sysinit.target
                                                   |
                                 _________________/|\___________________
                                /                  |                    \
                                |                  |                    |
                                v                  |                    v
                            (various               |              rescue.service
                           sockets...)             |                    |
                                |                  |                    v
                                v                  |              rescue.target
                         sockets.target            |
                                |                  |
                                \_________________ |                                 emergency.service
                                                  \|                                         |
                                                   v                                         v
                                             basic.target                             emergency.target
                                                   |
                            ______________________/|
                           /                       |
                           |                       v
                           |            initrd-root-device.target
                           |                       |
                           |                       v
                           |            dracut-pre-mount.service
                           |                       |
                           |                       v
                           |                  sysroot.mount
                           |                       |
                           |                       v
                           |             initrd-root-fs.target
               (custom initrd services)            |
                           |                       v
                           |             dracut-mount.service
                           |                       |
                           |                       v
                           |            initrd-parse-etc.service
                           |                       |
                           |                       v
                           |            (sysroot-usr.mount and
                           |             various mounts marked
                           |               with fstab option
                           |                x-initrd.mount)
                           |                       |
                           |                       v
                           |                initrd-fs.target
                           \______________________ |
                                                  \|
                                                   v
                                              initrd.target
                                                   |
                                                   v
                                        dracut-pre-pivot.service
                                                   |
                                                   v
                                         initrd-cleanup.service
                                              isolates to
                                        initrd-switch-root.target
                                                   |
                                                   v
                            ______________________/|
                           /                       |
                           |        initrd-udevadm-cleanup-db.service
                           |                       |
               (custom initrd services)            |
                           |                       |
                           \______________________ |
                                                  \|
                                                   v
                                       initrd-switch-root.target
                                                   |
                                                   v
                                       initrd-switch-root.service
                                                   |
                                                   v
                                              switch-root

AUTHOR

Harald Hoyer

SEE ALSO

dracut(8) bootup(7)