Digimer at 20:01, 5 October 2014

2014-10-05T20:01:16Z

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			{{note\|1=This is an 'informal' tutorial, written in the first person and not edited to the same degree as full tutorials.}}

	= The Goal =		= The Goal =

Digimer: /* Booting Off Both Disks */

2014-10-05T20:00:12Z

Booting Off Both Disks

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Digimer: Created page with "{{howto header}} = The Goal = A problem I had been struggling with since the release of RHEL/CentOS 7 is how to install on a software RAID 1 array such that either disk coul..."

2014-10-05T19:48:18Z

Created page with "{{howto header}} = The Goal = A problem I had been struggling with since the release of RHEL/CentOS 7 is how to install on a software RAID 1 array such that either disk coul..."

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{{howto header}}

= The Goal =

A problem I had been struggling with since the release of RHEL/CentOS 7 is how to install on a software RAID 1 array such that either disk could be used to boot.

= The Problem =

There are two problems;

# The default behaviour of anaconda prevents the creation of the biosboot partition on both disks. When I tried to to manually create the partitions by dropping to shell, anaconda would later fault out and the install would not complete. To get around this, a [[kickstart]] script is needed, which was booted off of a [[PXE]] server.
# After the kickstart install, only one disk was bootable. Trying to install grup on the second disk caused a crash.

= The Fixes =

== Install ==

I have a [[Setting_Up_a_PXE_Server_on_an_RPM-based_OS|PXE Server]] already, so I decided to create a kickstart script and added an entry for it.

* [[Setting Up a PXE Server on an RPM-based OS]]

The kickstart script used to perform the CentOS 7 install was:

{{note|1=Update this to match the IP of your PXE server and update the partition sizes, host name and desired VG name to what you want.}}

{{note|1=The <span class="code">root</span> password is '<span class="code">initial</span>'.}}

<syntaxhighlight lang="text">
#version=RHEL7
# System authorization information
auth --enableshadow --passalgo=sha512

# Use network installation
url --url="http://10.255.255.254/c7/x86_64/img/"

# Run the Setup Agent on first boot
firstboot --disable
ignoredisk --only-use=sda,sdb

# Keyboard layouts
keyboard us

# System language
lang en_CA.UTF-8

# Network information
network --bootproto=dhcp --ipv6=auto --activate
network --hostname=an-nas02.kw01.alteeve.ca

# Root password
rootpw --iscrypted $6$0riSEDMyCvHPdhCv$lvuhEOqU2yo9szCJHtAsVUK3maHyWlpZmVi6PCRkrOfifL/38J7SaGUopehv/rzwQvhqxNla/jPvD10uwuPY4/

# System timezone
timezone Europe/London --isUtc

# System bootloader configuration
bootloader --location=mbr --boot-drive=sda

# Partition clearing information
clearpart --drives=sda,sdb --all --initlabel

# Disk partitioning information
part biosboot --fstype=biosboot --size=2 --ondisk=sda
part biosboot --fstype=biosboot --size=2 --ondisk=sdb

part raid.11 --size=500 --grow --ondisk=sda
part raid.12 --size=500 --grow --ondisk=sdb

raid pv.11 --fstype="lvmpv" --level=1 --device=md0 raid.11 raid.12

volgroup an-nas02_vg0 --pesize=4096 pv.11

logvol swap --fstype="swap" --size=32768 --name=lv_swap --vgname=an-nas02_vg0
logvol /boot --fstype="xfs" --size=512 --name=lv_boot --vgname=an-nas02_vg0
logvol / --fstype="xfs" --size=256000 --name=lv_root --vgname=an-nas02_vg0

eula --agreed

%packages
@core
vim
perl

%end
</syntaxhighlight>

To boot off of this kickstart file, I used the following PXE boot entry:

<syntaxhighlight lang="text">

LABEL c7_x86_64
MENU LABEL ^2) CentOS 7 x86_64 - an-nas02
KERNEL boot/c7/x86_64/vmlinuz
APPEND initrd=boot/c7/x86_64/initrd.img inst.repo=http://10.255.255.254/c7/x86_64/img/ ks=http://10.255.255.254/c7/x86_64/ks/an-nas02.ks
</syntaxhighlight>

With this in place, boot off of the PXE server, select the entry and go grab a coffee. When you get back, the install should be finished.

== Booting Off Both Disks ==

{{footer}}

Install CentOS7 with Software RAID 1 - Revision history

Digimer at 20:01, 5 October 2014

Digimer: /* Booting Off Both Disks */

Digimer: Created page with "{{howto header}} = The Goal = A problem I had been struggling with since the release of RHEL/CentOS 7 is how to install on a software RAID 1 array such that either disk coul..."