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Old 09-15-2008, 02:17 PM
Alan McKinnon
 
Default Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror

On Monday 15 September 2008 16:09:42 Michael Sullivan wrote:
> Is there a way to do this? *The problem with my
> theories on how to do this fall apart when I get to the part where a
> password has to be entered for rsync/scp.

ssh keys.

To avoid running more than one sync at a time, have the clients pull the tree
from the server in a cron spaced 30 minutes or an hour apart. Make sure you
pull the entire tree, and if you use eix to run update-eix afterwards on the
clients



--
alan dot mckinnon at gmail dot com
 
Old 09-15-2008, 02:41 PM
Alan McKinnon
 
Default Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror

On Monday 15 September 2008 16:31:45 Michael Sullivan wrote:
> On Mon, 2008-09-15 at 16:17 +0200, Alan McKinnon wrote:
> > On Monday 15 September 2008 16:09:42 Michael Sullivan wrote:
> > > Is there a way to do this? The problem with my
> > > theories on how to do this fall apart when I get to the part where a
> > > password has to be entered for rsync/scp.
> >
> > ssh keys.
> >
> > To avoid running more than one sync at a time, have the clients pull the
> > tree from the server in a cron spaced 30 minutes or an hour apart. Make
> > sure you pull the entire tree, and if you use eix to run update-eix
> > afterwards on the clients
>
> Create ssh keys without passphrases? That's not recommended...

True, but it's infinitely better than a passwordless account. You did say that
you want an automated rsync/scp solution, that precludes setting up an rsync
server. I don't see that any other realistic options exist.

--
alan dot mckinnon at gmail dot com
 
Old 09-15-2008, 04:01 PM
Vaeth
 
Default Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror

On Mon, 15 Sep 2008, Michael Sullivan wrote:
> On Mon, 2008-09-15 at 16:17 +0200, Alan McKinnon wrote:
> > On Monday 15 September 2008 16:09:42 Michael Sullivan wrote:
> > > Is there a way to do this? The problem with my
> > > theories on how to do this fall apart when I get to the part where a
> > > password has to be entered for rsync/scp.
> >
> > ssh keys. [...]
> Create ssh keys without passphrases? That's not recommended...

It depends: If you use these keys for nothing else than to login to
your "server" machine (to fetch the portage tree) (and of course if
you keep the key readable only for the cron-job on the client) then
the only risk you have is: If the client (or the user for the cron-job)
gets compromised then also the server might get compromised/spied to some
extend (depending on which permissions allows the server to the account
which you use for syncing, i.e. which is accepting the corresponding
ssh key).

But this risk is always there, no matter which approach you choose...

An alternative - if you really just want to use keys with a passphrase -
is to use net-misc/keychain. Of course, this means that you have to
(manually) enter the passphrase at least once after booting or otherwise
your cron-job will fail.

> > and if you use eix to run update-eix afterward

I would even recommend to use eix-sync to do all in the correct order:
Call it on the client side with option "-s user@server[:dir]"
(or put the line with this option into /etc/eix-sync.conf if you want
to use this option practically always); this supports even keychain:
Put e.g. the line
~keychain --quiet ~/.ssh/id_rsa ; cat ~/.keychain/"$(hostname)-sh"
into /etc/eix-sync.conf; see the eix manpage and eix-sync -h for details).

An alternative might be to use option "-2 ..." on the server side,
but this supports currently _one_ client and requires that eix-sync -u
(or at least update-eix) is called afterwards on the client side.
 
Old 09-15-2008, 09:34 PM
Neil Bothwick
 
Default Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror

On Mon, 15 Sep 2008 16:41:05 +0200, Alan McKinnon wrote:

> True, but it's infinitely better than a passwordless account. You did
> say that you want an automated rsync/scp solution, that precludes
> setting up an rsync server. I don't see that any other realistic
> options exist.

Why does it preclude an rsync server? What wrong with running an rsync
server with a suitable "host allow" in the config? That would allow local
connections only without the need for passwords or keys.


--
Neil Bothwick

"Bad dog! Leave that wire alone.....click.....###@*##....NO TERRIER
 
Old 09-16-2008, 06:42 AM
Alan McKinnon
 
Default Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror

On Monday 15 September 2008 23:34:43 Neil Bothwick wrote:
> On Mon, 15 Sep 2008 16:41:05 +0200, Alan McKinnon wrote:
> > True, but it's infinitely better than a passwordless account. You did
> > say that you want an automated rsync/scp solution, that precludes
> > setting up an rsync server. I don't see that any other realistic
> > options exist.
>
> Why does it preclude an rsync server?

No good technical reason. I inferred from the OP's original mail that he
wanted to use plain rsync or scp and his intention was not to set up an rsync
server

> What wrong with running an rsync
> server with a suitable "host allow" in the config? That would allow local
> connections only without the need for passwords or keys.

That is indeed the preferred way

--
alan dot mckinnon at gmail dot com
 
Old 09-16-2008, 07:29 AM
Vaeth
 
Default Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror

> > What wrong with running an rsync
> > server with a suitable "host allow" in the config? That would allow local
> > connections only without the need for passwords or keys.
>
> That is indeed the preferred way

It is much more dangerous than the ssh approach: It is not so hard to
fake an IP (unless you local net ist physically separated) but it is
close to impossible to fake an ssh key without compromising the machine
holding it.
 
Old 09-16-2008, 10:16 AM
Neil Bothwick
 
Default Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror

On Tue, 16 Sep 2008 09:29:59 +0200 (CEST), Vaeth wrote:

> > > What wrong with running an rsync
> > > server with a suitable "host allow" in the config? That would allow
> > > local connections only without the need for passwords or keys.
> >
> > That is indeed the preferred way
>
> It is much more dangerous than the ssh approach: It is not so hard to
> fake an IP (unless you local net ist physically separated) but it is
> close to impossible to fake an ssh key without compromising the machine
> holding it.

Leaving aside the difficulties of faking a LAN IP from the public side
of the router, or even the fact that the router may have the rsync ports
closed, what is so secret about the contents of the portage tree?


--
Neil Bothwick

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Not a lot more admittedly..."
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Not a lot more admittedly..."
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...
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delete the system at the bottom, and send out copies of this message to
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return to power your civilization until entropy reaches its maximum!"
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Because oct 31 is the same as dec 25.
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Are you using Windows or is that just an XT?
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and I can wash it as fast as I want!"
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Your lack of organisation does not represent an
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Are you using Windows or is that just an XT?
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Unable to open TROUSER.ZIP - replace floppy and retry.
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Oxymoron: Reagan memoirs.
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A. It was dead.
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why do kamikazee pilots wear helmets?
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If you're not part of the solution, you're part of the precipitate. *
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. <-Stealth Tagline
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"How long is this Beta guy going to keep testing our stuff?"
 
Old 09-16-2008, 10:49 AM
Etaoin Shrdlu
 
Default Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror

On Tuesday 16 September 2008, 12:16, Neil Bothwick wrote:

[snip]

Uhm...something bad probably happened while the signature was appended to
the message :-)
 
Old 09-16-2008, 11:49 AM
Vaeth
 
Default Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror

Neil Bothwick wrote:

> On Tue, 16 Sep 2008 09:29:59 +0200 (CEST), Vaeth wrote:
>
> > > > What wrong with running an rsync
> > > > server with a suitable "host allow" in the config? [...]
> > >
> > > That is indeed the preferred way
> >
> > It is much more dangerous than the ssh approach [...]
>
> Leaving aside the difficulties of faking a LAN IP from the public side
> of the router, or even the fact that the router may have the rsync ports
> closed, what is so secret about the contents of the portage tree?

It is always better to have a port not open than to rely on a router
to "close" it apparently.
Moreover, who can guarantee you that the portage tree is the only thing
which is possible to see with a faked IP: Every program might have
vulnerabilities, so the less you provide to the outside world
(even if visible only through IP faking) the more secure you are.
Probably, sshd is needed anyway, so if possible this should be the only
thing potentially visible from the outside.
 
Old 09-16-2008, 11:49 AM
Iain Buchanan
 
Default Is there a way to automate rsync of updated portage tree across multiple boxes without each having to pull it down from a gentoo mirror

Etaoin Shrdlu wrote:

On Tuesday 16 September 2008, 12:16, Neil Bothwick wrote:

[snip]

Uhm...something bad probably happened while the signature was appended to
the message :-)



probably missed a few delimiters there in his home-spun fortune file!

Hey Neil, you didn't come up with all those attributed to you, did you?

--
Iain Buchanan <iaindb at netspace dot net dot au>

"We ought to make the pie higher."

George W. Bush
February 15, 2000
Comment made in Columbia, South Carolina during presidential campaign.
 

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