[Gluster-users] Removing spurious hostname from peer configuration

[Strahil Nikolov]

Hi Pat I have done something similar with downtime (on a lab), but I think you don't need any downtime.

Here is my idea:
- Edit all nodes and remove that file
- Stop Glusterd on all nodes (Glusterd , but not the bricks' processes)
- Start Glusterd on all nodes

It seems that if you edit on 1 node and restart , the node will get the configuration from the other node which will have the 2 hostnames. Thus , you need to power down all glusterd processes in the TSP.

Yet, I haven't done it exactly like that (I stopped also the bricks, but I could afford it) and you need to do a test on a set of VMs.


Best Regards,
Strahil Nikolov






В петък, 28 август 2020 г., 19:57:18 Гринуич+3, Pat Haley <phaley at mit.edu> написа: 










Hi All,

We have a distributed gluster filesystem across 2 servers.  We recently realized that one of the servers (mseas-data3) has 2 hostnames for the other server (mseas-data2).  One of these is on an external port that we rarely use.  When that port went down following a power outage, we ended up in a weird state where the gluster filesystem was being served to the rest of the cluster but (a) mseas-data3 kept indicating that mseas-data2 was disconnected in response to "gluster peer status" and (b) we kept having to restart the glusterd daemon on mseas-data3.  Since we don't use the external port much and didn't think gluster used it at all it was a while before we diagnosed the problem.

Now we would like to expunge that external hostname by making the following changes


Current setting on MSEAS-DATA3
/var/lib/glusterd/peers/c1110fd9-cb99-4ca1-b18a-536a122d67ef
uuid=c1110fd9-cb99-4ca1-b18a-536a122d67ef
state=3
hostname1=MSEAS-DATA2.MIT.EDU
hostname2=mseas-data2




Proposed change on MSEAS-DATA3
/var/lib/glusterd/peers/c1110fd9-cb99-4ca1-b18a-536a122d67ef
uuid=c1110fd9-cb99-4ca1-b18a-536a122d67ef
state=3
#hostname1=MSEAS-DATA2.MIT.EDU
hostname1=mseas-data2 
(manually changing a configuration file).  Is this the correct approach?  Do we need to make this change in additional files as well? Do we need to bring down the volume and daemons first?

Any advice will be greatly appreciated

Thanks

Pat

-- 

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Pat Haley                          Email:  phaley at mit.edu
Center for Ocean Engineering       Phone:  (617) 253-6824
Dept. of Mechanical Engineering    Fax:    (617) 253-8125
MIT, Room 5-213                    http://web.mit.edu/phaley/www/
77 Massachusetts Avenue
Cambridge, MA  02139-4301


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