Re: [gentoo-user] My first initramfs

Canek Peláez Valdés <caneko@×××××.com> wrote:

> On Tue, Nov 12, 2013 at 3:55 PM, Tanstaafl <tanstaafl@×××××××××××.org> wrote:
> > On 2013-11-12 4:49 PM, Tanstaafl <tanstaafl@×××××××××××.org> wrote:
> >>
> >> Ok, looking into this now...
> >>
> >> Reading the referenced wiki page shows this comment:
> >>
> >>> Introduction and bootloader configuration
> >>>
> >>> To create an initramfs, it is important that you know what
> >>> additional drivers, scripts and tools you need to boot your system.
> >>> For instance, if you use LVM, then you will need to support LVM tools
> >>> on the initramfs. Likewise, if you use software RAID, you need mdadm,
> >>> etc.
> >>
> >>
> >> I thought I'd mentioned/asked this before, but don't recall a
> >> satisfactory answer...
> >>
> >> Ok, up until now, I haven't *had* to 'know' what additional drivers are
> >> needed by my system to boot.
> >>
> >> So... how the heck am I supposed to find out? Trial and error?
> >
> >
> > Further down under the genkernel section has:
> >
> >> Depending on your system, you might want to add one or more of the
> >> following options:
> >> Option  Description
> >> --disklabel     Add support for LABEL= settings in your /etc/fstab
> >> --dmraid        Add support for fake hardware RAID
> >> --firmware      Add in firmware code found on the system
> >> --gpg   Add in GnuPG support
> >> --iscsi         Add support for iSCSI
> >> --luks  Add support for luks encryption containers
> >> --lvm   Add support for LVM
> >> --mdadm         Add support for software RAID
> >> --multipath     Add support for multiple I/O access towards a SAN
> >> --zfs   Add support for ZFS
> >
> >
> > So, are these *all* of the potential options? If so, then I can probably
> > safely say that all I need is lvm...
>
> You *MUST* add the necessary modules/tools to mount root and/or /usr.
> So if you have an XFS partition on a LVM volume on top of an mdraid,
> and the partition is encrypted, then you need the kernel modules for
> xfs, lvm, mdraid and crypt, and the corresponding userspace tools,
> including fsck.xfs.
>
> You *MAY* add whatever else you want in your initramfs (I add the
> drivers for my USB keyboard, so in case of emergencies I can actually
> type commands), but the only parts you *MUST* include are the ones you
> need to mount (and check) your root and /usr partitions.
>
> I strongly recommend dracut; the modules listed in DRACUT_MODULES are
> usually self explanatory, and it Just Works™.
Hi.  I am using genkernel and openrc and it boots correctly using lvm,
(I have ext2-3 modules built in), but what it does never do is check the
/usr which is on a separate partition before mounting, so /usr is never
checked unless I boot from a live cd and do it myself.  I wonder if
there is any way to get this to be done?



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