[ClusterLabs] Fast-failover on 2 nodes + qnetd: qdevice connenction disrupted.
alexey at pavlyuts.ru
alexey at pavlyuts.ru
Fri May 3 09:18:38 EDT 2024
Hi,
> > Thanks great for your suggestion, probably I need to think about this
> > way too, however, the project environment is not a good one to rely on
> > fencing and, moreover, we can't control the bottom layer a trusted
> > way.
>
> That is a problem. A VM being gone is not the only possible failure scenario. For
> example, a kernel or device driver issue could temporarily freeze the node, or
> networking could temporarily drop out, causing the node to appear lost to
> Corosync, but the node could be responsive again (with the app running) after the
> app has been started on the other node.
>
> If there's no problem with the app running on both nodes at the same time, then
> that's fine, but that's rarely the case. If an IP address is needed, or shared storage
> is used, simultaneous access will cause problems that only fencing can avoid.
The pacemaker use very pessimistic approach if you set resources to require quorum.
If a network outage is trigger changes, it will ruin quorum first and after that try to rebuild it. Therefore there are two questions:
1. How to keep active app running?
2. How to prevent two copies started.
As for me, quorum-dependent resource management performs well on both points.
> > my goal is to keep the app from moves (e.g. restarts) as long as
> > possible. This means only two kinds of moves accepted: current host
> > fail (move to other with restart) or admin move (managed move at
> > certain time with restart). Any other troubles should NOT trigger app
> > down/restart. Except of total connectivity loss where no second node,
> > no arbiter => stop service.
>
> Total connectivity loss may not be permanent. Fencing ensures the connectivity
> will not be restored after the app is started elsewhere.
Nothing bad if it restored and the node alive, but got app down because of no quorum.
> Pacemaker 2.0.4 and later supports priority-fencing-delay which allows the node
> currently running the app to survive. The node not running the app will wait the
> configured amount of time before trying to fence the other node. Of course that
> does add more time to the recovery if the node running the app is really gone.
I feel I am not sure about how it works.
Imagine just connectivity loss between nodes but no to the other pars.
And Node1 runs app. Everything well, node2 off.
So, we start Node2 with intention to restore cluster.
Node 2 starts and trying to find it's partner, failure and fence node1 out.
While Node1 not even know about Node2 starts.
Is it correct?
> >
> > Therefore, quorum-based management seems better way for my exact case.
>
> Unfortunately it's unsafe without fencing.
You may say I am stupid, but I really can’t understand why quorum-based resource management is unreliable without fencing.
May a host hold quorum bit longer than another host got quorum and run app. Probably, it may do this.
But fencing is not immediate too. So, it can't protect for 100% from short-time parallel runs.
> That does complicate the situation. Ideally there would be some way to request
> the VM to be immediately destroyed (whether via fence_xvm, a cloud provider
> API, or similar).
What you mean by "destroyed"? Mean get down?
>
> >
> > Please, mind all the above is from my common sense and quite poor
> > fundamental knowledge in clustering. And please be so kind to correct
> > me if I am wrong at any point.
> >
> > Sincerely,
> >
> > Alex
> > -----Original Message-----
> > From: Users <users-bounces at clusterlabs.org> On Behalf Of Ken Gaillot
> > Sent: Thursday, May 2, 2024 5:55 PM
> > To: Cluster Labs - All topics related to open-source clustering
> > welcomed <users at clusterlabs.org>
> > Subject: Re: [ClusterLabs] Fast-failover on 2 nodes + qnetd: qdevice
> > connenction disrupted.
> >
> > I don't see fencing times in here -- fencing is absolutely essential.
> >
> > With the setup you describe, I would drop qdevice. With fencing,
> > quorum is not strictly required in a two-node cluster (two_node should
> > be set in corosync.conf). You can set priority-fencing-delay to reduce
> > the chance of simultaneous fencing. For VMs, you can use fence_xvm,
> > which is extremely quick.
> >
> > On Thu, 2024-05-02 at 02:56 +0300, alexey at pavlyuts.ru wrote:
> > > Hi All,
> > >
> > > I am trying to build application-specific 2-node failover cluster
> > > using ubuntu 22, pacemaker 2.1.2 + corosync 3.1.6 and DRBD 9.2.9,
> > > knet transport.
> > >
> > > For some reason I can’t use 3-node then I have to use
> > > qnetd+qdevice
> > > 3.0.1.
> > >
> > > The main goal Is to protect custom app which is not cluster-aware by
> > > itself. It is quite stateful, can’t store the state outside memory
> > > and take some time to get converged with other parts of the system,
> > > then the best scenario is “failover is a restart with same config”,
> > > but each unnecessary restart is painful. So, if failover done, app
> > > must retain on the backup node until it fail or admin push it back,
> > > this work well with stickiness param.
> > >
> > > So, the goal is to detect serving node fail ASAP and restart it ASAP
> > > on other node, using DRBD-synced config/data. ASAP means within 5-
> > > 7
> > > sec, not 30 or more.
> > >
> > > I was tried different combinations of timing, and finally got
> > > acceptable result within 5 sec for the best case. But! The case is
> > > very unstable.
> > >
> > > My setup is a simple: two nodes on VM, and one more VM as arbiter
> > > (qnetd), VMs under Proxmox and connected by net via external
> > > ethernet switch to get closer to reality where “nodes VM” should
> > > locate as VM on different PHY hosts in one rack.
> > >
> > > Then, it was adjusted for faster detect and failover.
> > > In Corosync, left the token default 1000ms, but add
> > > “heartbeat_failures_allowed: 3”, this made corosync catch node
> > > failure for about 200ms (4x50ms heartbeat).
> > > Both qnet and qdevice was run with net_heartbeat_interval_min=200
> > > to allow play with faster hearbeats and detects Also,
> > > quorum.device.net has timeout: 500, sync_timeout: 3000, algo:
> > > LMS.
> > >
> > > The testing is to issue “ate +%M:%S.%N && qm stop 201”, and then
> > > check the logs on timestamp when the app started on the “backup”
> > > host. And, when backup host boot again, the test is to check the
> > > logs for the app was not restarted.
> > >
> > > Sometimes switchover work like a charm but sometimes it may delay
> > > for dozens of seconds.
> > > Sometimes when the primary host boot up again, secondary hold quorum
> > > well and keep app running, sometimes quorum is lost first (and
> > > pacemaker downs the app) and then found and pacemaker get app up
> > > again, so unwanted restart happen.
> > >
> > > My investigation shows that the difference between “good” and “bad”
> > > cases:
> > >
> > > Good case - all the logs clear and reasonable.
> > >
> > > Bad case: qnetd losing connection to second node just after the
> > > connection to “failure” node detected and then it may take dozens of
> > > seconds to restore it. All this time qdevice trying to connect qnetd
> > > and fails:
> > >
> > > Example, host 192.168.100.1 send to failure, 100.2 is failover to:
> > >
> > > From qnetd:
> > > May 01 23:30:39 arbiter corosync-qnetd[6338]: Client
> > > ::ffff:192.168.100.1:60686 doesn't sent any message during 600ms.
> > > Disconnecting
> > > May 01 23:30:39 arbiter corosync-qnetd[6338]: Client
> > > ::ffff:192.168.100.1:60686 (init_received 1, cluster bsc-test-
> > > cluster, node_id 1) disconnect May 01 23:30:39 arbiter
> > > corosync-qnetd[6338]: algo-lms: Client
> > > 0x55a6fc6785b0 (cluster bsc-test-cluster, node_id 1) disconnect
> > > May 01 23:30:39 arbiter corosync-qnetd[6338]: algo-lms: server
> > > going down 0
> > > > > > This is unexpected down, at normal scenario connection persist
> > > May 01 23:30:40 arbiter corosync-qnetd[6338]: Client
> > > ::ffff:192.168.100.2:32790 doesn't sent any message during 600ms.
> > > Disconnecting
> > > May 01 23:30:40 arbiter corosync-qnetd[6338]: Client
> > > ::ffff:192.168.100.2:32790 (init_received 1, cluster bsc-test-
> > > cluster, node_id 2) disconnect May 01 23:30:40 arbiter
> > > corosync-qnetd[6338]: algo-lms: Client
> > > 0x55a6fc6363d0 (cluster bsc-test-cluster, node_id 2) disconnect
> > > May 01 23:30:40 arbiter corosync-qnetd[6338]: algo-lms: server
> > > going down 0
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: New client connected
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: cluster name = bsc-
> > > test-cluster
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: tls started = 0
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: tls peer
> > > certificate
> > > verified = 0
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: node_id = 2
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: pointer =
> > > 0x55a6fc6363d0
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: addr_str =
> > > ::ffff:192.168.100.2:57736
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: ring id = (2.801)
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: cluster dump:
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: client =
> > > ::ffff:192.168.100.2:57736, node_id = 2 May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]: Client
> > > ::ffff:192.168.100.2:57736 (cluster bsc-test-cluster, node_id 2)
> > > sent initial node list.
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: msg seq num = 99
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: Node list:
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: 0 node_id = 1,
> > > data_center_id = 0, node_state = not set
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: 1 node_id = 2,
> > > data_center_id = 0, node_state = not set May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]: algo-lms: cluster bsc- test-cluster
> > > config_list has 2 nodes May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]:
> > > Algorithm
> > > result vote is No change May 01 23:30:56 arbiter corosync-
> > > qnetd[6338]:
> > > Client
> > > ::ffff:192.168.100.2:57736 (cluster bsc-test-cluster, node_id 2)
> > > sent membership node list.
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: msg seq num = 100
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: ring id = (2.801)
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: heuristics =
> > > Undefined
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: Node list:
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: 0 node_id = 2,
> > > data_center_id = 0, node_state = not set May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]:
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: algo-lms: membership
> > > list from node 2 partition (2.801) May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]: algo-util: partition
> > > (2.801) (0x55a6fc67e110) has 1 nodes May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]: algo-lms: Only 1 partition. This is
> > > votequorum's problem, not ours May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]: Algorithm result vote is ACK May 01
> > > 23:30:56 arbiter corosync-qnetd[6338]: Client
> > > ::ffff:192.168.100.2:57736 (cluster bsc-test-cluster, node_id 2)
> > > sent quorum node list.
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: msg seq num = 101
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: quorate = 0
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: Node list:
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: 0 node_id = 1,
> > > data_center_id = 0, node_state = dead
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: 1 node_id = 2,
> > > data_center_id = 0, node_state = member May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]:
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: algo-lms: quorum node
> > > list from node 2 partition (2.801) May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]: algo-util: partition
> > > (2.801) (0x55a6fc697e70) has 1 nodes May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]: algo-lms: Only 1 partition. This is
> > > votequorum's problem, not ours May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]: Algorithm result vote is ACK May 01
> > > 23:30:56 arbiter corosync-qnetd[6338]: Client
> > > ::ffff:192.168.100.2:57736 (cluster bsc-test-cluster, node_id 2)
> > > sent quorum node list.
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: msg seq num = 102
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: quorate = 1
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: Node list:
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: 0 node_id = 1,
> > > data_center_id = 0, node_state = dead
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: 1 node_id = 2,
> > > data_center_id = 0, node_state = member May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]:
> > > May 01 23:30:56 arbiter corosync-qnetd[6338]: algo-lms: quorum node
> > > list from node 2 partition (2.801) May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]: algo-util: partition
> > > (2.801) (0x55a6fc669dc0) has 1 nodes May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]: algo-lms: Only 1 partition. This is
> > > votequorum's problem, not ours May 01 23:30:56 arbiter
> > > corosync-qnetd[6338]: Algorithm result vote is ACK May 01
> > > 23:30:58 arbiter corosync-qnetd[6338]: Client closed connection May
> > > 01
> > > 23:30:58 arbiter corosync-qnetd[6338]: Client
> > > ::ffff:192.168.100.2:57674 (init_received 0, cluster bsc-test-
> > > cluster, node_id 0) disconnect
> > > > > At this point resource start on backup host
> > >
> > > From qdevice:
> > >
> > > May 01 23:30:40 node2 corosync-qdevice[781]: Server closed
> > > connection May 01 23:30:40 node2 corosync-qdevice[781]: algo-lms:
> > > disconnected.
> > > quorate = 1, WFA = 0
> > > May 01 23:30:40 node2 corosync-qdevice[781]: algo-lms:
> > > disconnected.
> > > reason = 22, WFA = 0
> > > May 01 23:30:40 node2 corosync-qdevice[781]: Algorithm result vote
> > > is NACK May 01 23:30:40 node2 corosync-qdevice[781]: Cast vote timer
> > > remains scheduled every 250ms voting NACK.
> > > May 01 23:30:40 node2 corosync-qdevice[781]: Sleeping for 161 ms
> > > before reconnect May 01 23:30:40 node2 corosync-qdevice[781]:
> > > Trying
> > > connect to qnetd server arbiter:5403 (timeout = 400ms) May 01
> > > 23:30:41
> > > node2 corosync-qdevice[781]: Connect timeout May 01 23:30:41 node2
> > > corosync-qdevice[781]: algo-lms: disconnected.
> > > quorate = 1, WFA = 0
> > > May 01 23:30:41 node2 corosync-qdevice[781]: algo-lms:
> > > disconnected.
> > > reason = 27, WFA = 0
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Algorithm result vote
> > > is NACK May 01 23:30:41 node2 corosync-qdevice[781]: Cast vote timer
> > > remains scheduled every 250ms voting NACK.
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Trying connect to qnetd
> > > server arbiter:5403 (timeout = 400ms) May 01 23:30:41 node2
> > > corosync-qdevice[781]: Votequorum nodelist notify callback:
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Ring_id = (2.801)
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Node list (size =
> > > 1):
> > > May 01 23:30:41 node2 corosync-qdevice[781]: 0 nodeid = 2
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Algorithm decided to
> > > pause cast vote timer and result vote is No change May 01 23:30:41
> > > node2 corosync-qdevice[781]: Cast vote timer is now paused.
> > > May 01 23:30:41 node2 corosync-qdevice[781]: worker:
> > > qdevice_heuristics_worker_cmd_process_exec: Received exec command
> > > with seq_no "24" and timeout "1500"
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Received heuristics
> > > exec result command with seq_no "24" and result "Disabled"
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Votequorum heuristics
> > > exec result callback:
> > > May 01 23:30:41 node2 corosync-qdevice[781]: seq_number = 24,
> > > exec_result = Disabled
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Algorithm decided to
> > > not send list, result vote is No change and heuristics is Undefined
> > > May
> > > 01
> > > 23:30:41 node2 corosync-qdevice[781]: Cast vote timer is no longer
> > > paused.
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Not scheduling
> > > heuristics timer because mode is not enabled May 01 23:30:41 node2
> > > corosync-qdevice[781]: Votequorum quorum notify
> > > callback:
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Quorate = 0
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Node list (size =
> > > 3):
> > > May 01 23:30:41 node2 corosync-qdevice[781]: 0 nodeid = 1,
> > > state
> > > = 2
> > > May 01 23:30:41 node2 corosync-qdevice[781]: 1 nodeid = 2,
> > > state
> > > = 1
> > > May 01 23:30:41 node2 corosync-qdevice[781]: 2 nodeid = 0,
> > > state
> > > = 0
> > > May 01 23:30:41 node2 corosync-qdevice[781]: algo-lms:
> > > quorum_notify.
> > > quorate = 0
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Algorithm decided to
> > > not send list and result vote is No change May 01 23:30:41 node2
> > > corosync-qdevice[781]: Connect timeout May 01 23:30:41 node2
> > > corosync-qdevice[781]: algo-lms: disconnected.
> > > quorate = 0, WFA = 0
> > > May 01 23:30:41 node2 corosync-qdevice[781]: algo-lms:
> > > disconnected.
> > > reason = 27, WFA = 0
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Algorithm result vote
> > > is NACK May 01 23:30:41 node2 corosync-qdevice[781]: Cast vote timer
> > > remains scheduled every 250ms voting NACK.
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Trying connect to qnetd
> > > server arbiter:5403 (timeout = 400ms)
> > > > > > At this point quorum reported lost
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Connect timeout May
> > > 01
> > > 23:30:41 node2 corosync-qdevice[781]: algo-lms: disconnected.
> > > quorate = 0, WFA = 0
> > > May 01 23:30:41 node2 corosync-qdevice[781]: algo-lms:
> > > disconnected.
> > > reason = 27, WFA = 0
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Algorithm result vote
> > > is NACK May 01 23:30:41 node2 corosync-qdevice[781]: Cast vote timer
> > > remains scheduled every 250ms voting NACK.
> > >
> > > > > > This failure pattern repeats 31 times
> > > May 01 23:30:41 node2 corosync-qdevice[781]: Trying connect to qnetd
> > > server arbiter:5403 (timeout = 400ms) May 01 23:30:42 node2
> > > corosync-qdevice[781]: Connect timeout May 01 23:30:42 node2
> > > corosync-qdevice[781]: algo-lms: disconnected.
> > > quorate = 0, WFA = 0
> > > May 01 23:30:42 node2 corosync-qdevice[781]: algo-lms:
> > > disconnected.
> > > reason = 27, WFA = 0
> > > May 01 23:30:42 node2 corosync-qdevice[781]: Algorithm result vote
> > > is NACK May 01 23:30:42 node2 corosync-qdevice[781]: Cast vote timer
> > > remains scheduled every 250ms voting NACK.
> > > > > > End of pattern repeat, continue
> > >
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Trying connect to qnetd
> > > server arbiter:5403 (timeout = 400ms) May 01 23:30:56 node2
> > > corosync-qdevice[781]: Sending preinit msg to qnetd May 01
> > > 23:30:56
> > > node2 corosync-qdevice[781]: Received preinit reply msg May 01
> > > 23:30:56 node2 corosync-qdevice[781]: Received init reply msg May
> > > 01
> > > 23:30:56 node2 corosync-qdevice[781]: Scheduling send of heartbeat
> > > every 400ms May 01 23:30:56 node2 corosync-qdevice[781]: Executing
> > > after-connect heuristics.
> > > May 01 23:30:56 node2 corosync-qdevice[781]: worker:
> > > qdevice_heuristics_worker_cmd_process_exec: Received exec command
> > > with seq_no "25" and timeout "250"
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Received heuristics
> > > exec result command with seq_no "25" and result "Disabled"
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Algorithm decided to
> > > send config node list, send membership node list, send quorum node
> > > list, heuristics is Undefined and result vote is Wait for reply May
> > > 01
> > > 23:30:56 node2 corosync-qdevice[781]: Sending set option seq = 98,
> > > HB(0) = 0ms, KAP Tie-breaker(1) = Enabled May 01 23:30:56 node2
> > > corosync-qdevice[781]: Sending config node list seq = 99
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Node list:
> > > May 01 23:30:56 node2 corosync-qdevice[781]: 0 node_id = 1,
> > > data_center_id = 0, node_state = not set
> > > May 01 23:30:56 node2 corosync-qdevice[781]: 1 node_id = 2,
> > > data_center_id = 0, node_state = not set May 01 23:30:56 node2
> > > corosync-qdevice[781]: Sending membership node list seq = 100,
> > > ringid = (2.801), heuristics = Undefined.
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Node list:
> > > May 01 23:30:56 node2 corosync-qdevice[781]: 0 node_id = 2,
> > > data_center_id = 0, node_state = not set May 01 23:30:56 node2
> > > corosync-qdevice[781]: Sending quorum node list seq = 101, quorate =
> > > 0
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Node list:
> > > May 01 23:30:56 node2 corosync-qdevice[781]: 0 node_id = 1,
> > > data_center_id = 0, node_state = dead
> > > May 01 23:30:56 node2 corosync-qdevice[781]: 1 node_id = 2,
> > > data_center_id = 0, node_state = member May 01 23:30:56 node2
> > > corosync-qdevice[781]: Cast vote timer is now stopped.
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Received set option
> > > reply
> > > seq(1) = 98, HB(0) = 0ms, KAP Tie-breaker(1) = Enabled May 01
> > > 23:30:56
> > > node2 corosync-qdevice[781]: Received initial config node list reply
> > > May 01 23:30:56 node2 corosync-qdevice[781]: seq = 99
> > > May 01 23:30:56 node2 corosync-qdevice[781]: vote = No change
> > > May 01 23:30:56 node2 corosync-qdevice[781]: ring id = (2.801)
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Algorithm result vote
> > > is No change May 01 23:30:56 node2 corosync-qdevice[781]: Received
> > > membership node list reply
> > > May 01 23:30:56 node2 corosync-qdevice[781]: seq = 100
> > > May 01 23:30:56 node2 corosync-qdevice[781]: vote = ACK
> > > May 01 23:30:56 node2 corosync-qdevice[781]: ring id = (2.801)
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Algorithm result vote
> > > is ACK May 01 23:30:56 node2 corosync-qdevice[781]: Cast vote timer
> > > is now scheduled every 250ms voting ACK.
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Received quorum node
> > > list reply
> > > May 01 23:30:56 node2 corosync-qdevice[781]: seq = 101
> > > May 01 23:30:56 node2 corosync-qdevice[781]: vote = ACK
> > > May 01 23:30:56 node2 corosync-qdevice[781]: ring id = (2.801)
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Algorithm result vote
> > > is ACK May 01 23:30:56 node2 corosync-qdevice[781]: Cast vote timer
> > > remains scheduled every 250ms voting ACK.
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Votequorum quorum
> > > notify
> > > callback:
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Quorate = 1
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Node list (size =
> > > 3):
> > > May 01 23:30:56 node2 corosync-qdevice[781]: 0 nodeid = 1,
> > > state
> > > = 2
> > > May 01 23:30:56 node2 corosync-qdevice[781]: 1 nodeid = 2,
> > > state
> > > = 1
> > > May 01 23:30:56 node2 corosync-qdevice[781]: 2 nodeid = 0,
> > > state
> > > = 0
> > > May 01 23:30:56 node2 corosync-qdevice[781]: algo-lms:
> > > quorum_notify.
> > > quorate = 1
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Algorithm decided to
> > > send list and result vote is No change May 01 23:30:56 node2
> > > corosync-qdevice[781]: Sending quorum node list seq = 102, quorate =
> > > 1
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Node list:
> > > May 01 23:30:56 node2 corosync-qdevice[781]: 0 node_id = 1,
> > > data_center_id = 0, node_state = dead
> > > May 01 23:30:56 node2 corosync-qdevice[781]: 1 node_id = 2,
> > > data_center_id = 0, node_state = member May 01 23:30:56 node2
> > > corosync-qdevice[781]: Received quorum node list reply
> > > May 01 23:30:56 node2 corosync-qdevice[781]: seq = 102
> > > May 01 23:30:56 node2 corosync-qdevice[781]: vote = ACK
> > > May 01 23:30:56 node2 corosync-qdevice[781]: ring id = (2.801)
> > > May 01 23:30:56 node2 corosync-qdevice[781]: Algorithm result vote
> > > is ACK May 01 23:30:56 node2 corosync-qdevice[781]: Cast vote timer
> > > remains scheduled every 250ms voting ACK.
> > > > > > Here everything become OK and resource started on Node2
> > >
> > > Also, I’ve done wireshark capture and found great mess in TCP, it
> > > seems like connection between qdevice and qnetd really stops for
> > > some time and packets won’t deliver.
> > >
> > > For my guess, it match corosync syncing activities, and I suspect
> > > that corosync prevent any other traffic on the interface it use for
> > > rings.
> > >
> > > As I switch qnetd and qdevice to use different interface it seems to
> > > work fine.
> > >
> > > So, the question is: does corosync really temporary blocks any other
> > > traffic on the interface it uses? Or it is just a coincidence? If it
> > > blocks, is there a way to manage it?
> > >
> > > Thank you for any suggest on that!
> > >
> > > Sincerely,
> > >
> > > Alex
> > >
> > >
> > > _______________________________________________
> > > Manage your subscription:
> > > https://lists.clusterlabs.org/mailman/listinfo/users
> > >
> > > ClusterLabs home: https://www.clusterlabs.org/
> > --
> > Ken Gaillot <kgaillot at redhat.com>
> >
> > _______________________________________________
> > Manage your subscription:
> > https://lists.clusterlabs.org/mailman/listinfo/users
> >
> > ClusterLabs home: https://www.clusterlabs.org/
> >
> > _______________________________________________
> > Manage your subscription:
> > https://lists.clusterlabs.org/mailman/listinfo/users
> >
> > ClusterLabs home: https://www.clusterlabs.org/
> --
> Ken Gaillot <kgaillot at redhat.com>
>
> _______________________________________________
> Manage your subscription:
> https://lists.clusterlabs.org/mailman/listinfo/users
>
> ClusterLabs home: https://www.clusterlabs.org/
More information about the Users
mailing list