Re: [ClusterLabs] questions about startup fencing

2017-12-06 Thread Adam Spiers
Ken Gaillot wrote: On Thu, 2017-11-30 at 11:58 +, Adam Spiers wrote: Ken Gaillot wrote: On Wed, 2017-11-29 at 14:22 +, Adam Spiers wrote: [snipped] Let's suppose further that the cluster configuration is such that no stateful resources

Re: [ClusterLabs] questions about startup fencing

2017-12-01 Thread Ken Gaillot
On Fri, 2017-12-01 at 16:21 -0600, Ken Gaillot wrote: > On Thu, 2017-11-30 at 11:58 +, Adam Spiers wrote: > > Ken Gaillot wrote: > > > On Wed, 2017-11-29 at 14:22 +, Adam Spiers wrote: > > > > Hi all, > > > > > > > > A colleague has been valiantly trying to help me

Re: [ClusterLabs] questions about startup fencing

2017-12-01 Thread Ken Gaillot
On Thu, 2017-11-30 at 11:58 +, Adam Spiers wrote: > Ken Gaillot wrote: > > On Wed, 2017-11-29 at 14:22 +, Adam Spiers wrote: > > > Hi all, > > > > > > A colleague has been valiantly trying to help me belatedly learn > > > about > > > the intricacies of startup

Re: [ClusterLabs] questions about startup fencing

2017-11-30 Thread Adam Spiers
Ken Gaillot wrote: On Wed, 2017-11-29 at 14:22 +, Adam Spiers wrote: Hi all, A colleague has been valiantly trying to help me belatedly learn about the intricacies of startup fencing, but I'm still not fully understanding some of the finer points of the behaviour.

Re: [ClusterLabs] questions about startup fencing

2017-11-30 Thread Andrei Borzenkov
On Thu, Nov 30, 2017 at 1:39 PM, Gao,Yan wrote: > On 11/30/2017 09:14 AM, Andrei Borzenkov wrote: >> >> On Wed, Nov 29, 2017 at 6:54 PM, Ken Gaillot wrote: >>> >>> >>> The same scenario is why a single node can't have quorum at start-up in >>> a cluster with

Re: [ClusterLabs] questions about startup fencing

2017-11-30 Thread Gao,Yan
On 11/30/2017 09:14 AM, Andrei Borzenkov wrote: On Wed, Nov 29, 2017 at 6:54 PM, Ken Gaillot wrote: The same scenario is why a single node can't have quorum at start-up in a cluster with "two_node" set. Both nodes have to see each other at least once before they can

Re: [ClusterLabs] questions about startup fencing

2017-11-30 Thread Andrei Borzenkov
On Wed, Nov 29, 2017 at 6:54 PM, Ken Gaillot wrote: > > The same scenario is why a single node can't have quorum at start-up in > a cluster with "two_node" set. Both nodes have to see each other at > least once before they can assume it's safe to do anything. > Unless we set

Re: [ClusterLabs] questions about startup fencing

2017-11-29 Thread Klaus Wenninger
On 11/29/2017 09:09 PM, Kristoffer Grönlund wrote: > Adam Spiers writes: > >> OK, so reading between the lines, if we don't want our cluster's >> latest config changes accidentally discarded during a complete cluster >> reboot, we should ensure that the last man standing is also

Re: [ClusterLabs] questions about startup fencing

2017-11-29 Thread Kristoffer Grönlund
Adam Spiers writes: > > OK, so reading between the lines, if we don't want our cluster's > latest config changes accidentally discarded during a complete cluster > reboot, we should ensure that the last man standing is also the first > one booted up - right? That would make

Re: [ClusterLabs] questions about startup fencing

2017-11-29 Thread Adam Spiers
Kristoffer Gronlund wrote: Adam Spiers writes: Kristoffer Gronlund wrote: Adam Spiers writes: - The whole cluster is shut down cleanly. - The whole cluster is then started up again. (Side question: what

Re: [ClusterLabs] questions about startup fencing

2017-11-29 Thread Adam Spiers
Klaus Wenninger wrote: On 11/29/2017 04:23 PM, Kristoffer Grönlund wrote: Adam Spiers writes: - The whole cluster is shut down cleanly. - The whole cluster is then started up again. (Side question: what happens if the last node to shut down is not

Re: [ClusterLabs] questions about startup fencing

2017-11-29 Thread Adam Spiers
Kristoffer Gronlund wrote: Adam Spiers writes: - The whole cluster is shut down cleanly. - The whole cluster is then started up again. (Side question: what happens if the last node to shut down is not the first to start up? How will the cluster

Re: [ClusterLabs] questions about startup fencing

2017-11-29 Thread Gao,Yan
On 11/29/2017 04:54 PM, Ken Gaillot wrote: On Wed, 2017-11-29 at 14:22 +, Adam Spiers wrote: The same questions apply if this troublesome node was actually a remote node running pacemaker_remoted, rather than the 5th node in the cluster. Remote nodes don't join at the crmd level as

Re: [ClusterLabs] questions about startup fencing

2017-11-29 Thread Ken Gaillot
On Wed, 2017-11-29 at 14:22 +, Adam Spiers wrote: > Hi all, > > A colleague has been valiantly trying to help me belatedly learn > about > the intricacies of startup fencing, but I'm still not fully > understanding some of the finer points of the behaviour. > > The documentation on the

Re: [ClusterLabs] questions about startup fencing

2017-11-29 Thread Klaus Wenninger
On 11/29/2017 04:23 PM, Kristoffer Grönlund wrote: > Adam Spiers writes: > >> - The whole cluster is shut down cleanly. >> >> - The whole cluster is then started up again. (Side question: what >> happens if the last node to shut down is not the first to start up? >> How

Re: [ClusterLabs] questions about startup fencing

2017-11-29 Thread Kristoffer Grönlund
Adam Spiers writes: > - The whole cluster is shut down cleanly. > > - The whole cluster is then started up again. (Side question: what > happens if the last node to shut down is not the first to start up? > How will the cluster ensure it has the most recent version of the