After discussions with a teammate exists a second network connection to the other datacenter. so my question is answered. thanks to all.
-----Ursprüngliche Nachricht----- Von: Andreas Kurz [mailto:andr...@hastexo.com] Gesendet: Donnerstag, 10. November 2011 13:26 An: pacemaker@oss.clusterlabs.org Betreff: Re: [Pacemaker] Question: 2 node cluster in two datacenters - how to avoid split brain On 11/10/2011 10:21 AM, Senftleben, Stefan (itsc) wrote: > Hello, > > first of all I want to say hello all recipients of the pacemaker > mailinglist! > > I manage a two node active-passive cluster with an ms-drbd-resource and > a depending resource. > Each node is located in a separate datacenter, connected by a single > dwdm-connection, a second network connection is not available. Hmm ... what about the service network? Is that no option for a second cluster communication path or is that all the same network? > In case of a network interuption between the datacenters a split brain > situation is created and a manual intervention of the admin is needed. > > What are your recommendations for me to avoid the split brain situation? Only using a manual fencing method like meatware, can't think of another reliable fencing method between different sites as there are too many cases where a stonith event is not appropriate only on the information of one lost link. Regards, Andreas -- Need help with Pacemaker? http://www.hastexo.com/now > > > > Thanks in advance! > > Best regards, > > Stefan > > > > _Following the configuration:_ > > node lxds05 \ > attributes standby="off" > node lxds07 \ > attributes standby="off" > primitive apache2 ocf:heartbeat:apache \ > params configfile="/etc/apache2/apache2.conf" > httpd="/usr/sbin/apache2" \ > operations $id="apache2-operations" \ > op start interval="0" timeout="240" \ > op stop interval="0" timeout="240" \ > op monitor interval="15" timeout="20" start-delay="0" \ > meta target-role="started" failure-timeout="60" > primitive omd_site_main ocf:omd:omdnagios \ > params site="main" \ > op monitor interval="30s" timeout="30s" \ > op start interval="0s" timeout="240s" \ > op stop interval="0s" timeout="240s" \ > meta target-role="Started" failure-timeout="60" > primitive pri_drbd_omd ocf:linbit:drbd \ > params drbd_resource="nagios" \ > operations $id="drbd_disk-operations" \ > op monitor interval="10" timeout="240" \ > meta failure-timeout="60" > primitive pri_fs_omd ocf:heartbeat:Filesystem \ > params device="/dev/drbd0" directory="/opt/omd/" fstype="ext4" \ > operations $id="pri_fs_omd-operations" \ > op start interval="0" timeout="240" \ > op stop interval="0" timeout="360" \ > op monitor interval="15" timeout="20" start-delay="0" \ > op notify interval="0" timeout="20" \ > meta target-role="started" failure-timeout="60" > primitive pri_nagiosIP ocf:heartbeat:IPaddr2 \ > params ip="192.168.12.21" cidr_netmask="24" iflabel="NagiosIP" \ > operations $id="pri_nagiosIP-operations" \ > op start interval="0" timeout="20" \ > op stop interval="0" timeout="20" \ > op monitor interval="10" timeout="20" start-delay="0" \ > meta target-role="started" failure-timeout="60" > primitive res_MailTo_1 ocf:heartbeat:MailTo \ > params email="stefan.senftle...@itsc.de" subject="nagios-group" \ > operations $id="res_MailTo_1-operations" \ > op start interval="0" timeout="10" \ > op stop interval="0" timeout="10" \ > op monitor interval="10" timeout="10" start-delay="0" \ > meta failure-timeout="60" > primitive res_MailTo_2 ocf:heartbeat:MailTo \ > params email="stefan.senftle...@itsc.de" subject="omd_site_main" \ > operations $id="res_MailTo_2-operations" \ > op start interval="0" timeout="10" \ > op stop interval="0" timeout="10" \ > op monitor interval="10" timeout="10" start-delay="0" \ > meta failure-timeout="60" > primitive res_ping_1 ocf:pacemaker:ping \ > params multiplier="1000" host_list="192.168.12.1 192.168.12.2 > 192.168.12.13" \ > operations $id="res_ping_1-operations" \ > op start interval="0" timeout="60" \ > op stop interval="0" timeout="20" \ > op monitor interval="10" timeout="60" start-delay="0" \ > op reload interval="0" timeout="100" > group nagios-group pri_fs_omd pri_nagiosIP apache2 \ > meta target-role="started" failure-timeout="60" > ms ms_drbd_omd pri_drbd_omd \ > meta clone-max="2" notify="true" > clone cl_ping_1 res_ping_1 \ > meta clone-max="2" notify="true" > location loc_drbdmaster_ping ms_drbd_omd \ > rule $id="loc_drbdmaster_ping-rule" $role="Master" pingd: > defined pingd > colocation col_omd_follows_drbd inf: nagios-group ms_drbd_omd:Master > colocation col_omd_site_main_nagios-group inf: omd_site_main nagios-group > colocation col_res_MailTo_1_nagios-group inf: res_MailTo_1 nagios-group > colocation col_res_MailTo_2_omd_site_main inf: res_MailTo_2 omd_site_main > order ord_drbd_before_omd inf: ms_drbd_omd:promote nagios-group:start > order ord_nagios-group_omd_site_main inf: nagios-group omd_site_main > order ord_nagios-group_res_MailTo_1 inf: nagios-group res_MailTo_1 > order ord_omd_site_main_res_MailTo_2 inf: omd_site_main res_MailTo_2 > property $id="cib-bootstrap-options" \ > expected-quorum-votes="2" \ > stonith-enabled="false" \ > dc-version="1.0.8-042548a451fce8400660f6031f4da6f0223dd5dd" \ > no-quorum-policy="ignore" \ > cluster-infrastructure="openais" \ > last-lrm-refresh="1320683212" > rsc_defaults $id="rsc-options" \ > resource-stickiness="100" > > > > > > > > > _______________________________________________ > Pacemaker mailing list: Pacemaker@oss.clusterlabs.org > http://oss.clusterlabs.org/mailman/listinfo/pacemaker > > Project Home: http://www.clusterlabs.org > Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf > Bugs: > http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker _______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
