Gluster users - Sep 2020 - Upgrade best practices request

Howdy, all -

I have inherited a system which is running an ancient version of Gluster 
- I think it's 3.x (but I'm not at the site where it's running now) 
running on CentOS 7.

Obviously, I want to update it to the latest version, but I really don't 
want to screw anything up.

Is there a "correct" way of getting from 3.x to 8.x? Do I need to do
any
intermediate steps first, like 3 to 4?

Many thanks!
Thomas

Theoretically it should work from 3.X to 8.X , but this scenario is the least
tested.
Most users prefer to go over the 3.x to 5.x to 7.x and when you feel 8.X stable
enough - you got one step ahead.

As we got some issues in the past (already fixed) with replica volumes
(sharding) in oVirt (3.12.x to 5.5) , I would highly recommend you to test on a
test cluster (same patch level and version) before proceeding on prod.


Another approach that comes to my mind is to create a new cluster on CentOS8 and
latest gluster available there and use geo replication to sync both clusters.
Once the cutover time comes, you can just stop the geo rep and reconfigure the
clients to use the new cluster.


Best Regards,
Strahil Nikolov






? ???????, 1 ????????? 2020 ?., 22:01:49 ???????+3, Thomas Cameron
<thomas.cameron at camerontech.com> ??????:





Howdy, all -

I have inherited a system which is running an ancient version of Gluster 
- I think it's 3.x (but I'm not at the site where it's running now) 
running on CentOS 7.

Obviously, I want to update it to the latest version, but I really don't 
want to screw anything up.

Is there a "correct" way of getting from 3.x to 8.x? Do I need to do
any
intermediate steps first, like 3 to 4?

Many thanks!
Thomas
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I have done a test from gluster 3.7.6 recently ,It can direct upgrade
to 7.7,but I have to upgrade my centos 7.0 to centos 7.8 first, It look
like gluster server don't work at old system from gluster 4.1,so when
you meet some problem ,try to upgrade you os first.



On Tue, 2020-09-01 at 14:01 -0500, Thomas Cameron wrote:
> Howdy, all -
> 
> I have inherited a system which is running an ancient version of
> Gluster 
> - I think it's 3.x (but I'm not at the site where it's running
now)
> running on CentOS 7.
> 
> Obviously, I want to update it to the latest version, but I really
> don't 
> want to screw anything up.
> 
> Is there a "correct" way of getting from 3.x to 8.x? Do I need to
do
> any 
> intermediate steps first, like 3 to 4?
> 
> Many thanks!
> Thomas
> ________
> 
> 
> 
> Community Meeting Calendar:
> 
> Schedule -
> Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC
> Bridge: https://bluejeans.com/441850968
> 
> Gluster-users mailing list
> Gluster-users at gluster.org
> https://lists.gluster.org/mailman/listinfo/gluster-users