[Gluster-users] Upgrading from Gluster 3.8 to 3.12

[Ziemowit Pierzycki]

I have not done the upgrade yet.  Since this is a production cluster I
need to make sure it stays up or schedule some downtime if it doesn't
doesn't.  Thanks.

On Tue, Dec 19, 2017 at 10:11 AM, Atin Mukherjee <amukherj at redhat.com> wrote:
>
>
> On Tue, Dec 19, 2017 at 1:10 AM, Ziemowit Pierzycki <ziemowit at pierzycki.com>
> wrote:
>>
>> Hi,
>>
>> I have a cluster of 10 servers all running Fedora 24 along with
>> Gluster 3.8.  I'm planning on doing rolling upgrades to Fedora 27 with
>> Gluster 3.12.  I saw the documentation and did some testing but I
>> would like to run my plan through some (more?) educated minds.
>>
>> The current setup is:
>>
>> Volume Name: vol0
>> Distributed-Replicate
>> Number of Bricks: 2 x (2 + 1) = 6
>> Bricks:
>> Brick1: glt01:/vol/vol0
>> Brick2: glt02:/vol/vol0
>> Brick3: glt05:/vol/vol0 (arbiter)
>> Brick4: glt03:/vol/vol0
>> Brick5: glt04:/vol/vol0
>> Brick6: glt06:/vol/vol0 (arbiter)
>>
>> Volume Name: vol1
>> Distributed-Replicate
>> Number of Bricks: 2 x (2 + 1) = 6
>> Bricks:
>> Brick1: glt07:/vol/vol1
>> Brick2: glt08:/vol/vol1
>> Brick3: glt05:/vol/vol1 (arbiter)
>> Brick4: glt09:/vol/vol1
>> Brick5: glt10:/vol/vol1
>> Brick6: glt06:/vol/vol1 (arbiter)
>>
>> After performing the upgrade because of differences in checksums, the
>> upgraded nodes will become:
>>
>> State: Peer Rejected (Connected)
>
>
> Have you upgraded all the nodes? If yes, have you bumped up the
> cluster.op-version after upgrading all the nodes? Please follow :
> http://docs.gluster.org/en/latest/Upgrade-Guide/op_version/ for more details
> on how to bump up the cluster.op-version. In case you have done all of these
> and you're seeing a checksum issue then I'm afraid you have hit a bug. I'd
> need further details like the checksum mismatch error from glusterd.log file
> along with the the exact volume's info file from
> /var/lib/glusterd/vols/<volname>/info between both the peers to debug this
> further.
>
>>
>> If I start doing the upgrades one at a time, with nodes glt10 to glt01
>> except for the arbiters glt05 and glt06, and then upgrading the
>> arbiters last, everything should remain online at all times through
>> the process.  Correct?
>>
>> Thanks.
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>
>