CentOS - May 2016 - Reduce existing CentOS 7 installation to "Minimal install" - services?

On 05/06/2016 06:46 AM, Nicolas Kovacs wrote:
> Le 06/05/2016 11:13, Nicolas Thierry-Mieg a ?crit :
>> you're probably removing too many packages, eg some key package is
a dep
>> of MINIMAL but not in MINIMAL, and "yum remove" removes it
and all its
>> dependants.
>> Maybe add "yum install $MINIMAL" after your yum remove
command.
>> Or replace yum remove with "rpm -e" to see if and who in
$SUPPRIMER has
>> deps in MINIMAL.
> 
> I gave it another spin, this time with rpm -e $SUPPRIMER. Got no error
> messages, rpm -e simply wiped all non-essential packages. So I don't
> think the problem comes from some removed minimal package.
> 
> This time I activated startup messages. Booting gets stuck right after
> mounting /boot. I'll try to reproduce it, since I can't copy/paste
it.
> 
> [  OK  ] Mounted /boot.
> [ TIME ] Timed out waiting for device
> dev-mapper-centos_amandine\x2dhome.device.
> [DEPEND] Dependency failed for /home.
> 
> And then quite a few lines, and booting into emergency mode.
> 
> Any suggestions?
> 
> Niki
> 
Maybe add a:

yum groupinstall core



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Le 06/05/2016 13:50, Johnny Hughes a ?crit :
> Maybe add a:
> 
> yum groupinstall core
That did add a handful of packages indeed (as was already suggested in
the previous answer), but the problem still persists.

After rebooting, the system hangs after mounting the /boot partition and
then exits into emergency mode.

I'm puzzled.

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On 05/06/2016 11:18 AM, Nicolas Kovacs wrote:
> Le 06/05/2016 13:50, Johnny Hughes a ?crit :
>> Maybe add a:
>>
>> yum groupinstall core
> 
> That did add a handful of packages indeed (as was already suggested in
> the previous answer), but the problem still persists.
> 
> After rebooting, the system hangs after mounting the /boot partition and
> then exits into emergency mode.
> 
> I'm puzzled.
> 
There actually are a couple more things than core in a minimal install
.. here is the current minimal list:

https://git.centos.org/blob/sig-core!comps.git/220ef7b59c95531d3752d4074ce673aa09792c67/c7-minimal-x86_64-RPMS.lst

some of those might not get installed every time (ie, disk encrypt may
not be on non-encrypted drives, etc.)

But it is a good starting point.

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Nicolas Kovacs wrote:
> Le 06/05/2016 13:50, Johnny Hughes a ?crit :
>> Maybe add a:
>>
>> yum groupinstall core
>
> That did add a handful of packages indeed (as was already suggested in
> the previous answer), but the problem still persists.
>
> After rebooting, the system hangs after mounting the /boot partition and
> then exits into emergency mode.
>
> I'm puzzled.
>
Question (if I haven't asked this before): what's in fstab, and on the
kernel grub2 line? A UUID, a /dev/sdx, or LABEL=? If the latter, there's a
bug in grub? the boot process, so if you have a LABEL=/root or
LABEL=/boot, it will fail, 100% of the time. Removing the leading / is the
workaround.

        mark