On 16/03/16 04:04 PM, Christopher Harvey wrote: > On Wed, Mar 16, 2016, at 04:00 PM, Digimer wrote: >> On 16/03/16 03:59 PM, Christopher Harvey wrote: >>> I am able to create a split brain situation in corosync 1.1.13 using >>> iptables in a 3 node cluster. >>> >>> I have 3 nodes, vmr-132-3, vmr-132-4, and vmr-132-5 >>> >>> All nodes are operational and form a 3 node cluster with all nodes are >>> members of that ring. >>> vmr-132-3 ---> Online: [ vmr-132-3 vmr-132-4 vmr-132-5 ] >>> vmr-132-4 ---> Online: [ vmr-132-3 vmr-132-4 vmr-132-5 ] >>> vmr-132-5 ---> Online: [ vmr-132-3 vmr-132-4 vmr-132-5 ] >>> so far so good. >>> >>> running the following on vmr-132-4 drops all incoming (but not outgoing) >>> packets from vmr-132-3: >>> # iptables -I INPUT -s 192.168.132.3 -j DROP >>> # iptables -L >>> Chain INPUT (policy ACCEPT) >>> target prot opt source destination >>> DROP all -- 192.168.132.3 anywhere >>> >>> Chain FORWARD (policy ACCEPT) >>> target prot opt source destination >>> >>> Chain OUTPUT (policy ACCEPT) >>> target prot opt source destination >>> >>> vmr-132-3 ---> Online: [ vmr-132-3 vmr-132-4 vmr-132-5 ] >>> vmr-132-4 ---> Online: [ vmr-132-4 vmr-132-5 ] >>> vmr-132-5 ---> Online: [ vmr-132-4 vmr-132-5 ] >>> >>> vmr-132-3 thinks everything is normal and continues to provide service, >>> vmr-132-4 and 5 form a new ring, achieve quorum and provide the same >>> service. Splitting the link between 3 and 4 in both directions isolates >>> vmr 3 from the rest of the cluster and everything fails over normally, >>> so only a unidirectional failure causes problems. >>> >>> I don't have stonith enabled right now, and looking over the >>> pacemaker.log file closely to see if 4 and 5 would normally have fenced >>> 3, but I didn't see any fencing or stonith logs. >>> >>> Would stonith solve this problem, or does this look like a bug? >> >> It should, that is its job. > > is there some log I can enable that would say > "ERROR: hey, I would use stonith here, but you have it disabled! your > warranty is void past this point! do not pass go, do not file a bug"?
If I had it my way, that would be printed to STDOUT when you start pacemaker without stonith... -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? _______________________________________________ Users mailing list: Users@clusterlabs.org http://clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
