[ClusterLabs] Interface confusion
Adam Budziński
budzinski.adam at gmail.com
Fri Mar 15 18:16:32 EDT 2019
Hi Tomas,
Ok but how then pacemaker or the fence agent knows which route to take to
reach the vCenter?
Btw. Do I have to add the stonith resource on each of the nodes or is it
just enough to add it on one as for other resources?
Thank you!
pt., 15.03.2019, 15:48 użytkownik Tomas Jelinek <tojeline at redhat.com>
napisał:
> Dne 15. 03. 19 v 15:09 Adam Budziński napsal(a):
> > Hello Tomas,
> >
> > Thank you! So far I need to say how great this community is, would
> > never expect so much positive vibes! A big thank you your doing a great
> > job!
> >
> > Now let's talk business :)
> >
> > So if pcsd is using ring0 and it fails will ring1 not be used at all?
>
> Pcs and pcsd never use ring1, but they are just tools for managing
> clusters. You can have a perfectly functioning cluster without pcs and
> pcsd running or even installed, it would be just more complicated to set
> it up and manage it.
>
> Even if ring0 fails, you will be able to use pcs (in somehow limited
> manner) as most of its commands don't go through network anyway.
>
> Corosync, which is the actual cluster messaging layer, will of course
> use ring1 in case of ring0 failure.
>
> >
> > So in regards to VMware that would mean that the interface should be
> > configured with a network that can access the vCenter to fence right?
> > But wouldn't it then use only ring0 so if that fails it wouldn't switch
> > to ring1?
>
> If you are talking about pcmk_host_map, that does not really have
> anything to do with network interfaces of cluster nodes. It maps node
> names (parts before :) to "ports" of a fence device (parts after :).
> Pcs-0.9.x does not support defining custom node names, therefore node
> names are the same as ring0 addresses.
>
> I am not an expert on fence agents / devices, but I'm sure someone else
> on this list will be able to help you with configuring fencing for your
> cluster.
>
>
> Tomas
>
> >
> > Thank you!
> >
> > pt., 15.03.2019, 13:14 użytkownik Tomas Jelinek <tojeline at redhat.com
> > <mailto:tojeline at redhat.com>> napisał:
> >
> > Dne 15. 03. 19 v 12:32 Adam Budziński napsal(a):
> > > Hello Folks,____
> > >
> > > __ __
> > >
> > > Tow node active/passive VMware VM cluster.____
> > >
> > > __ __
> > >
> > > /etc/hosts____
> > >
> > > __ __
> > >
> > > 10.116.63.83 srv1____
> > >
> > > 10.116.63.84 srv2____
> > >
> > > 172.16.21.12 srv2cr1____
> > >
> > > 172.16.22.12 srv2cr2____
> > >
> > > 172.16.21.11 srv1cr1____
> > >
> > > 172.16.22.11 srv1cr2____
> > >
> > > __ __
> > >
> > > __ __
> > >
> > > I have 3 NIC’s on each VM:____
> > >
> > > __ __
> > >
> > > 10.116.63.83 srv1 and 10.116.63.84 srv2 are networks used
> to
> > > access the VM’s via SSH or any resource directly if not via a
> > VIP.____
> > >
> > > __ __
> > >
> > > Everything with cr in its name is used for corosync
> > communication, so
> > > basically I have two rings (this are two no routable networks
> > just for
> > > that).____
> > >
> > > __ __
> > >
> > > My questions are:____
> > >
> > > __ __
> > >
> > > __1.__With ‘pcs cluster auth’ which interface / interfaces should
> > I use
> > > ?____
> >
> > Hi Adam,
> >
> > I can see you are using pcs-0.9.x. In that case you should do:
> > pcs cluster auth srv1cr1 srv2cr1
> >
> > In other words, use the first address of each node.
> > Authenticating all the other addresses should not cause any issues.
> It
> > is pointless, though, as pcs only communicates via ring0 addresses.
> >
> > >
> > > __2.__With ‘pcs cluster setup –name’ I would use the corosync
> > interfaces
> > > e.g. ‘pcs cluster setup –name MyCluster srv1cr1,srv1cr2
> > srv2cr1,srv2cr2’
> > > right ?____
> >
> > Yes, that is correct.
> >
> > >
> > > __3.__With fence_vmware_soap inpcmk_host_map="X:VM_C;X:VM:OTRS_D"
> > which
> > > interface should replace X ?____
> >
> > X should be replaced by node names as seen by pacemaker. Once you
> > set up
> > and start your cluster, run 'pcs status' to get (amongs other info)
> the
> > node names. In your configuration, they should be srv1cr1 and
> srv2cr1.
> >
> >
> > Regards,
> > Tomas
> >
> > > __ __
> > >
> > > Thank you!
> > >
> > >
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