Hi Benoit, Can you describe your split brain issues you’re seeing?
By setting agent.lb.enable to true, all requests to the management servers will be internally balanced by the clustered management servers. In case of split-brain, you would get different API results, for example listing of resources such as users, hosts etc. Just make sure that you’re MySQL configuration works well with both the management servers individually. A possible case could be that one of the servers can reach the mysql server but the other one fails. > On 27-Oct-2014, at 2:30 pm, benoit lair <[email protected]> wrote: > > Hi Geoff, > > > Thanks a lot for your explanations. > > So when testing with a 2 nodes management servers, i had split brain > scenario :/ > > When installing the management server, did i do the rights things ? > > In my case 192.168.0.100 (VIP in netscaler, load balancing the ports you > listed above) with a service group including the 2 management server nodes > (192.168.0.10 for the first and 192.168.0.11 for the secondary) and a mysql > server with 192.168.0.200 > > For the first node (192.168.0.10) i've done : > > cloudstack-setup-databases cloud:[email protected] > <cloud%[email protected]> --deploy-as=root:mypassroot -e file -m > mypassphrase -k mypassphrase -i 192.168.0.100 > > The second node (192.168.0.11) was deployed with > cloudstack-setup-databases cloud:[email protected] > <cloud%[email protected]> -e file -m mypassphrase -k mypassphrase -i > 192.168.0.100 > > Is it alright, or is this what did a split brain scenario ? > > > Thanks a lot four your responses. > > Regards, Benoit. > > 2014-10-23 10:43 GMT+02:00 Geoff Higginbottom < > [email protected]>: > >> Hi Benoit >> >> When running more than one CloudStack Management Server you need to put a >> load balancer in front of them. This load balancer (or ideally pair of HA >> load balancers) need to manage the following ports >> >> 8250 - This is the port the System VMs use when communicating with the >> management servers, and they use the address specified in the 'host' global >> settings. >> >> 8080 - Access to the Web UI >> >> 8096 (or a port of your choosing) - Optional - only required is you are >> using the unauthenticated API port >> >> You can look in the 'cloud.hosts' table in the DB and check out the >> 'status' and 'mgmt_server_id' columns, the latter is the ID of the >> management server which is responsible for managing the System VM or >> Hypervisor. >> >> One last point, you need to ensure you have set global settings >> agent.lb.enable to true to enable the load balancing of System VMs and >> Hypervisors across multiple Management Servers. >> >> Regards >> >> Geoff Higginbottom >> >> D: +44 20 3603 0542 | S: +44 20 3603 0540 | M: +447968161581 >> >> [email protected] >> >> -----Original Message----- >> From: benoit lair [mailto:[email protected]] >> Sent: 23 October 2014 08:49 >> To: [email protected] >> Subject: Re: [ACS43][MGMT Server][Load Balancing] >> >> Any advice ? Any feedback ? Does somebody already did that ? >> >> Thanks for your responses. >> >> 2014-10-13 10:51 GMT+02:00 benoit lair <[email protected]>: >> >>> Hello, >>> >>> >>> Is there somebody already accomplished some load balancing on the >>> management app server ? >>> >>> >>> >>> Thanks for your responses. >>> >>> Regards. >>> >>> 2014-10-09 16:24 GMT+02:00 benoit lair <[email protected]>: >>> >>>> Here are the logs entries i have in the other mgmt node : >>>> >>>> DEBUG [c.c.a.m.ClusteredAgentManagerImpl] >>>> (AgentManager-Handler-8:null) Seq 1-289341441: MgmtId >>>> 104425904713066: Resp: Routing to peer >>>> >>>> 2014-10-09 16:21 GMT+02:00 benoit lair <[email protected]>: >>>> >>>>> What i was thinking of.. >>>>> >>>>> Here are the logs entries in one of my mgmt server : >>>>> >>>>> 2014-10-09 15:47:27,451 ERROR [c.c.c.ClusterManagerImpl] >>>>> (Cluster-Heartbeat-1:cx-71073990) We have detected that at least one >>>>> management server peer reports tat this management server is down, >>>>> perform active fencing to avoid split-brain ituation >>>>> >>>>> So this one has been shutdown. How to recover my 2 mgmt nodes in >>>>> normal state ? >>>>> >>>>> Thanks. >>>>> Regards, Benoit >>>>> >>>>> 2014-10-09 16:20 GMT+02:00 benoit lair <[email protected]>: >>>>> >>>>>> Hello, >>>>>> >>>>>> >>>>>> I would like to do some load balancing on the mgmt server, i would >>>>>> like to know if i am on the good way : >>>>>> >>>>>> I installed Two management servers. >>>>>> >>>>>> The first with the "deploy-as" in the command >>>>>> cloudstack-setup-databases with the netscalerlbip as the management >>>>>> server >>>>>> : >>>>>> >>>>>> cloudstack-setup-databases cloud:[email protected] >>>>>> --deploy-as=root:mypassroot -e file -m mypassphrase -k mypassphrase >>>>>> -i netscalerlbip >>>>>> >>>>>> The second node was deployed with >>>>>> cloudstack-setup-databases cloud:[email protected] -e file -m >>>>>> mypassphrase -k mypassphrase -i netscalerlbip >>>>>> >>>>>> So my netscaler is doing load balancing on the 2 nodes availables >>>>>> accross netscalerlbip. >>>>>> >>>>>> I have confgured the "host" global parameter with the netscalerlbip >>>>>> as ip and restarted the 2 mgmt servers. >>>>>> >>>>>> How to be sure that my mgmts servers are working correctly ? Am i >>>>>> sure not to have split brain ? >>>>>> >>>>>> Thanks for your responses. >>>>>> >>>>>> Regards, >>>>>> Benoit >>>>>> >>>>>> >>>>> >>>> >>> >> Find out more about ShapeBlue and our range of CloudStack related services >> >> IaaS Cloud Design & Build< >> http://shapeblue.com/iaas-cloud-design-and-build//> >> CSForge – rapid IaaS deployment framework<http://shapeblue.com/csforge/> >> CloudStack Consulting<http://shapeblue.com/cloudstack-consultancy/> >> CloudStack Infrastructure Support< >> http://shapeblue.com/cloudstack-infrastructure-support/> >> CloudStack Bootcamp Training Courses< >> http://shapeblue.com/cloudstack-training/> >> >> This email and any attachments to it may be confidential and are intended >> solely for the use of the individual to whom it is addressed. Any views or >> opinions expressed are solely those of the author and do not necessarily >> represent those of Shape Blue Ltd or related companies. 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