这是一个工具类，不是一个后台服务类
centos7.2-minimal就下面三个包
[root@1st-kvm ~]# rpm -qa|grep dracut
dracut-config-rescue-033-359.el7.x86_64
dracut-033-359.el7.x86_64
dracut-network-033-359.el7.x86_64
[root@222-comecs ~]# rpm -qf /var/log/dracut.log
dracut-004-335.el6.noarch
[root@222-comecs ~]# rpm -ql dracut|more
/etc/dracut.conf
/etc/dracut.conf.d
/etc/logrotate.d/dracut
/sbin/dracut
/sbin/lsinitrd
/sbin/mkinitrd
dracut - low-level tool for generating an initramfs image
47 dracut aa.img
49 lsinitrd aa.img
50 file aa.img
51 dracut --print-cmdline
57 dracut --list-modules|more
lsinitrd shows the contents of an initramfs image. if <image> is omitted, then lsinitrd uses the default image
/boot/<machine-id>/<kernel-version>/initrd or /boot/initramfs-<kernel-version>.img.
[root@222-comecs ~]# cat /etc/dracut.conf
# Sample dracut config file
# Specific list of dracut modules to use
#dracutmodules+=""
# Dracut modules to omit
#omit_dracutmodules+=""
# Dracut modules to add to the default
#add_dracutmodules+=""
# additional kernel modules to the default
#add_drivers+=""
# list of kernel filesystem modules to be included in the generic initramfs
#filesystems+=""
# build initrd only to boot current hardware
#hostonly="yes"
#
# install local /etc/mdadm.conf
mdadmconf="yes"
# install local /etc/lvm/lvm.conf
lvmconf="yes"