Mailing List Archive: start drbd with load balancing

start drbd with load balancing

Nov 11, 2001, 4:37 AM

Post #1 of 4 (699 views)

I want to start a drbd cluster in such a way to have simple load balancing, for example httpd
runs on node 1 as primary with drbd0 and smb runs on node 2 as primary with drbd1. When I
start drbd with /etc/rc.d/init.d/drbd start, it is primary for both nodes.

I would be a nice featuare if it could say in drbd.conf, which resource to start as primary and
which to start as secondary. Is something like this possible?

mfg ar

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RE: start drbd with load balancing [ In reply to ]

Wolfram.Weyer at example

Nov 12, 2001, 1:14 AM

Post #2 of 4 (677 views)

Permalink

This is not controlled by drbd but by heartbeat, therefor no need to put it
in drbd.conf. After synchronization during startup, drbd puts both nodes as
secondary and waits until heartbeat takes control.
You have to edit the /etc/ha.d/haresources file to determine which
application runs preferably on which node

e.g.:
node1 172.20.1.1 drbd0 httpd
node2 172.20.2.1 drbd1 smb

/Wolfram

>>> -----Original Message-----
>>> From: Andreas Rittershofer [mailto:andreas@example.com]
>>> Sent: Sonntag, 11. November 2001 12:37
>>> To: drbd-devel@example.com
>>> Subject: [DRBD-dev] start drbd with load balancing
>>>
>>>
>>> I want to start a drbd cluster in such a way to have simple
>>> load balancing, for example httpd
>>> runs on node 1 as primary with drbd0 and smb runs on node 2
>>> as primary with drbd1. When I
>>> start drbd with /etc/rc.d/init.d/drbd start, it is primary
>>> for both nodes.
>>>
>>> I would be a nice featuare if it could say in drbd.conf,
>>> which resource to start as primary and
>>> which to start as secondary. Is something like this possible?
>>>
>>>
>>> mfg ar
>>>
>>> --
>>> mailto:andreas@example.com
>>> http://www.rittershofer.de
>>> PGP-Public-Key http://www.rittershofer.de/ari.htm
>>>
>>>
>>> _______________________________________________
>>> DRBD-devel mailing list
>>> DRBD-devel@example.com
>>> https://lists.sourceforge.net/lists/listinfo/drbd-devel
>>>

RE: start drbd with load balancing [ In reply to ]

andreas at example

Nov 12, 2001, 12:06 PM

Post #3 of 4 (675 views)

Permalink

On 12 Nov 01, at 9:14, Weyer, Wolfram wrote:

> This is not controlled by drbd but by heartbeat, therefor no need to put
> it in drbd.conf. After synchronization during startup, drbd puts both
> nodes as secondary and waits until heartbeat takes control. You have to
> edit the /etc/ha.d/haresources file to determine which application runs
> preferably on which node

So heartbeat decides via haresources which node is primary for which resource?

>
> e.g.:
> node1 172.20.1.1 drbd0 httpd
> node2 172.20.2.1 drbd1 smb
>
> /Wolfram
>
> >>> -----Original Message-----
> >>> From: Andreas Rittershofer [mailto:andreas@example.com]
> >>> Sent: Sonntag, 11. November 2001 12:37
> >>> To: drbd-devel@example.com
> >>> Subject: [DRBD-dev] start drbd with load balancing
> >>>
> >>>
> >>> I want to start a drbd cluster in such a way to have simple
> >>> load balancing, for example httpd
> >>> runs on node 1 as primary with drbd0 and smb runs on node 2
> >>> as primary with drbd1. When I
> >>> start drbd with /etc/rc.d/init.d/drbd start, it is primary
> >>> for both nodes.
> >>>
> >>> I would be a nice featuare if it could say in drbd.conf,
> >>> which resource to start as primary and
> >>> which to start as secondary. Is something like this possible?
> >>>
> >>>
> >>> mfg ar
> >>>
> >>> --
> >>> mailto:andreas@example.com
> >>> http://www.rittershofer.de
> >>> PGP-Public-Key http://www.rittershofer.de/ari.htm
> >>>
> >>>
> >>> _______________________________________________
> >>> DRBD-devel mailing list
> >>> DRBD-devel@example.com
> >>> https://lists.sourceforge.net/lists/listinfo/drbd-devel
> >>>

mfg ar

--
mailto:andreas@example.com
http://www.rittershofer.de
PGP-Public-Key http://www.rittershofer.de/ari.htm

RE: start drbd with load balancing [ In reply to ]

Wolfram.Weyer at example

Nov 13, 2001, 12:46 AM

Post #4 of 4 (685 views)

Permalink

Yep!
If the primary (which is defined as the preferred node in the haresources
file) fails the resources are moved to the secondary. If the failed node
comes back the resources are moved back to this preferred node. I think
there is an option that disables this graceful failback, but I haven't found
it in the config files.

/Wolfram

>>> -----Original Message-----
>>> From: Andreas Rittershofer [mailto:andreas@example.com]
>>> Sent: Montag, 12. November 2001 20:07
>>> To: Weyer, Wolfram; drbd-devel@example.com
>>> Subject: RE: [DRBD-dev] start drbd with load balancing
>>>
>>>
>>> On 12 Nov 01, at 9:14, Weyer, Wolfram wrote:
>>>
>>> > This is not controlled by drbd but by heartbeat, therefor
>>> no need to put
>>> > it in drbd.conf. After synchronization during startup,
>>> drbd puts both
>>> > nodes as secondary and waits until heartbeat takes
>>> control. You have to
>>> > edit the /etc/ha.d/haresources file to determine which
>>> application runs
>>> > preferably on which node
>>>
>>> So heartbeat decides via haresources which node is primary
>>> for which resource?
>>>
>>> >
>>> > e.g.:
>>> > node1 172.20.1.1 drbd0 httpd
>>> > node2 172.20.2.1 drbd1 smb
>>> >
>>> > /Wolfram
>>> >
>>> > >>> -----Original Message-----
>>> > >>> From: Andreas Rittershofer [mailto:andreas@example.com]
>>> > >>> Sent: Sonntag, 11. November 2001 12:37
>>> > >>> To: drbd-devel@example.com
>>> > >>> Subject: [DRBD-dev] start drbd with load balancing
>>> > >>>
>>> > >>>
>>> > >>> I want to start a drbd cluster in such a way to have simple
>>> > >>> load balancing, for example httpd
>>> > >>> runs on node 1 as primary with drbd0 and smb runs on node 2
>>> > >>> as primary with drbd1. When I
>>> > >>> start drbd with /etc/rc.d/init.d/drbd start, it is primary
>>> > >>> for both nodes.
>>> > >>>
>>> > >>> I would be a nice featuare if it could say in drbd.conf,
>>> > >>> which resource to start as primary and
>>> > >>> which to start as secondary. Is something like this possible?
>>> > >>>
>>> > >>>
>>> > >>> mfg ar
>>> > >>>
>>> > >>> --
>>> > >>> mailto:andreas@example.com
>>> > >>> http://www.rittershofer.de
>>> > >>> PGP-Public-Key http://www.rittershofer.de/ari.htm
>>> > >>>
>>> > >>>
>>> > >>> _______________________________________________
>>> > >>> DRBD-devel mailing list
>>> > >>> DRBD-devel@example.com
>>> > >>> https://lists.sourceforge.net/lists/listinfo/drbd-devel
>>> > >>>
>>>
>>>
>>>
>>>
>>> mfg ar
>>>
>>> --
>>> mailto:andreas@example.com
>>> http://www.rittershofer.de
>>> PGP-Public-Key http://www.rittershofer.de/ari.htm
>>>