[ClusterLabs] Adding a node to the cluster deployed with "Unicast configuration"

[Alejandro Comisario]

Hi, im reviving this thread because of the following.

To add new nodes to the cluster, this procedure works like a charm.
But to take them out, i've assumed the follwing, whitch didnt worked.

* stop corosync/pacemaker on the old node
* update all corosync.conf on the cluster and took the old node of the config
* corosync-cfgtool -R from one of the nodes

But the old node never disappears as OFFLINE.
How can a i take out a node from the cluster and make is dissapear
from the nodes into it ?

best.

On Thu, Feb 23, 2017 at 1:23 PM, Alejandro Comisario
<alejandro at nubeliu.com> wrote:
> Amazing, i will try to do that on ubuntu also and get back to you !
> thanks for the help !
>
> On Wed, Feb 22, 2017 at 5:08 PM, Ken Gaillot <kgaillot at redhat.com> wrote:
>> On 02/22/2017 09:55 AM, Jan Friesse wrote:
>>> Alejandro Comisario napsal(a):
>>>> Hi everyone, i have a problem when scaling a corosync/pacemaker
>>>> cluster deployed using unicast.
>>>>
>>>> eg on corosync.conf.
>>>>
>>>> nodelist {
>>>> node {
>>>> ring0_addr: 10.10.0.10
>>>> nodeid: 1
>>>> }
>>>> node {
>>>> ring0_addr: 10.10.0.11
>>>> nodeid: 2
>>>> }
>>>> }
>>>>
>>>> Tried to add the new node with the new config (meaning, adding the new
>>>> node) nad leaving the other two with the same config and started
>>>> services on the third node, but doesnt seem to work until i update the
>>>> config on the server #1 and #2 and restart corosync/pacemaker which
>>>> does the obvious of bringing every resource down.
>>>>
>>>> There should be a way to "hot add" a new node to the cluster, but i
>>>> dont seem to find one.
>>>> what is the best way to add a node without bothering the rest ? or
>>>> better said, what is the right way to do it ?
>>>
>>> Adding node is possible with following process:
>>> - Add node to config file on both existing nodes
>>> - Exec corosync-cfgtool -R (it's enough to exec only on one of nodes)
>>> - Make sure 3rd (new) node has same config as two existing nodes
>>> - Start corosync/pcmk on new node
>>>
>>> This is (more or less) how pcs works. No stopping of corosync is needed.
>>>
>>> Regards,
>>>   Honza
>>
>> Ah, noted ... I need to update some upstream docs :-)
>>
>>>>
>>>> PS: i can't implement multicast on my network.
>>>>
>>
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>
>
>
> --
> Alejandrito

Alejandrito