CentOS - Jan 2017 - CentOS 7 install on one RAID 1 [not-so-SOLVED]

In article <1485416344.2047.1.camel at biggs.org.uk>,
Pete Biggs <pete at biggs.org.uk> wrote:
> 
> > 
> > If you are using RAID 1 kernel mirroring, you can do that with /boot
too,
> > and Grub finds the kernel just fine. I've done it many times:
> > 
> > 
> Hmm, OK. I wonder why anaconda doesn't do it then.
> 
> Reading various websites, it looks like grub2 can do it, but you have
> to make sure that various grub modules are installed first - i.e. do
> something like 
> 
>   grub-install --modules='biosdisk ext2 msdos raid mdraid' /dev/xxx
> 
> I don't know if they are added by default these days.
I don't know, but I've never had to do it, when using plain mirroring,
on either C4, C5 or C6.  I can imagine you would need to if /boot was
RAID 0 striped, if indeed that is even possible.
> The other gotcha is, of course, that the boot sectors aren't RAID'd
-
> so if /dev/sda goes, replacing it will make the system unbootable since
> it doesn't contain the boot sectors. Hot swap will keep the system
> running but you have to remember to re-install the correct boot sector
> before reboot. If you have to bring the machine down to change the
> disk, then things could get interesting!
Yup, been there, done that. So long as you use grub to install the boot
sector on both drives, then you can always tell the BIOS to boot from
the other drive to bring the system up after replacing the first disk.

Anaconda doesn't set up the boot sector on the second drive by default,
so I put some grub commands in the post-install section of kickstart
to do so.

Cheers
Tony
-- 
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org

On 01/26/2017 01:40 AM, Tony Mountifield wrote:
> Anaconda doesn't set up the boot sector on the second drive by default,
> so I put some grub commands in the post-install section of kickstart
> to do so.

I can't attest that it *works* (mostly since I use UEFI everywhere 
possible) but anaconda definitely attempts to install grub on each drive 
with a copy of /boot:

https://github.com/rhinstaller/anaconda/blob/master/pyanaconda/bootloader.py

Hi all,

I use cURL to connect external https server from local apache php application.
I found this application only use even local port number and never use odd port
number.

My server info is as follows:

# uname -r
2.6.32-642.3.1.el6.x86_64

# sysctl -a | grep net.ipv4.ip_local
net.ipv4.ip_local_port_range = 32768	60999
net.ipv4.ip_local_reserved_ports = 

I want cURL use odd and even number as local port.

Any idea?

Thank you.
Yana

In article <5ef97952-14c0-6ad2-0803-c24691a6816b at gmail.com>,
Gordon Messmer <gordon.messmer at gmail.com>
wrote:
> On 01/26/2017 01:40 AM, Tony Mountifield wrote:
> > Anaconda doesn't set up the boot sector on the second drive by
default,
> > so I put some grub commands in the post-install section of kickstart
> > to do so.
> 
> 
> I can't attest that it *works* (mostly since I use UEFI everywhere 
> possible) but anaconda definitely attempts to install grub on each drive 
> with a copy of /boot:
> 
>
https://github.com/rhinstaller/anaconda/blob/master/pyanaconda/bootloader.py
Thanks, that's interesting to know. When I first started doing this it was
on
CentOS 4, and I'm pretty sure the second drive didn't get grubbed back
then,
which would be what prompted me to add the post-install grub for the second
drive at that time.

I never went back to check whether the need had been obviated in CentOS 5 or 6.

Cheers
Tony
-- 
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org