CentOS - May 2016 - one-shot yum command to match rpms between systems?

On Wed, 18 May 2016 09:30:54 +0100
James Hogarth wrote:
> And of course as will be pointed out by many the only right answer is yum
> update anyway given cherry picking updates is not supported.
The objective is not to cherry pick updates, but rather to install a second
system with packages that match the first system.  After fine-tuning the
installed packages and stripping out the unnecessary stuff, it would be nice to
just say "make that system look like this one" -- rsync for yum if you
will.  The specific package versions aren't important at that stage since I
can run yum update after the initial installation.

-- 
MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

On 18 May 2016 17:57, "Frank Cox" <theatre at
melvilletheatre.com> wrote:
>
> On Wed, 18 May 2016 09:30:54 +0100
> James Hogarth wrote:
>
> > And of course as will be pointed out by many the only right answer is
yum
> > update anyway given cherry picking updates is not supported.
>
> The objective is not to cherry pick updates, but rather to install a
second system with packages that match the first system.  After fine-tuning
the installed packages and stripping out the unnecessary stuff, it would be
nice to just say "make that system look like this one" -- rsync for
yum if
you will.  The specific package versions aren't important at that stage
since I can run yum update after the initial
installation.
>
Well if you're planning on doing a yum update anyway just cat rpmlist |
xargs yum -y install

Better solution to this though is a basic ansible task list defining what
you need.

On Wed, 18 May 2016 18:17:10 +0100
James Hogarth wrote:
> Well if you're planning on doing a yum update anyway just cat rpmlist |
> xargs yum -y install
That wouldn't remove the unneeded packages on the second system.

-- 
MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

Frank Cox wrote:
> On Wed, 18 May 2016 09:30:54 +0100
> James Hogarth wrote:
>
>> And of course as will be pointed out by many the only right answer is
>> yum
>> update anyway given cherry picking updates is not supported.
>
> The objective is not to cherry pick updates, but rather to install a
> second system with packages that match the first system.  After
> fine-tuning the installed packages and stripping out the unnecessary
> stuff, it would be nice to just say "make that system look like this
one"
> -- rsync for yum if you will.  The specific package versions aren't
> important at that stage since I can run yum update after the initial
> installation.
>
Two solutions, both of which we use here at work.

1. rpm -qa > file; minimal on new machine, and yum -y install $(cat file).
2. a) on new machine, mkdir /new /boot/new
   b) from old machine,
           sync -HPavzx --exclude=/old --exclude=/var/log/wtmp
--exclude=/var/log/lastlog $newmachine:/. /new/.
           rsync -HPavzx $machine:/boot/. /boot/new/.

   c) then:
rsync -HPavzx /etc/sysconfig/network-scripts/ifcfg-eth*
/new/etc/sysconfig/network-scripts
rsync -HPavzx /etc/sysconfig/hwconf /new/etc/sysconfig
rsync -HPavzx /boot/grub/device.map /boot/new/grub/
rsync -HPavzx /etc/udev/rules.d/70-persistent-net.rules
/new/etc/udev/rules.d/
rsync -HPavzx /etc/ssh/ssh_host* /new/etc/ssh

   d) zsh
zmodload zsh/files

cd /boot
mkdir old
mv * old
mv old/lost+found .
mv old/new/* .

# Root partition.
cd /
mkdir old
mv * old
mv old/lost+found .
mv old/root
mv old/new/* .
sync
sync
And reboot.

        mark