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9.8. Querying a Pacemaker Cluster with SNMP (Red Hat Enterprise Linux 7.5 and later)
As of Red Hat Enterprise Linux 7.5, you can use the
pcs_snmp_agent daemon to query a Pacemaker cluster for data by means of SNMP. The pcs_snmp_agent daemon is an SNMP agent that connects to the master agent (snmpd) by means of agentx protocol. The pcs_snmp_agent agent does not work as a standalone agent as it only provides data to the master agent.
The following procedure sets up a basic configuration for a system to use SNMP with a Pacemaker cluster. You run this procedure on each node of the cluster from which you will be using SNMP to fetch data for the cluster.
- Install the
pcs-snmppackage on each node of the cluster. This will also install thenet-snmppackage which provides thesnmpdaemon.#
yum install pcs-snmp - Add the following line to the
/etc/snmp/snmpd.confconfiguration file to set up thesnmpddaemon asmaster agentx.master agentx
- Add the following line to the
/etc/snmp/snmpd.confconfiguration file to enablepcs_snmp_agentin the same SNMP configuration.view systemview included .1.3.6.1.4.1.32723.100
- Start the
pcs_snmp_agentservice.#
systemctl start pcs_snmp_agent.service#systemctl enable pcs_snmp_agent.service - To check the configuration, display the status of the cluster with the
pcs statusand then try to fetch the data from SNMP to check whether it corresponds to the output. Note that when you use SNMP to fetch data, only primitive resources are provided.The following example shows the output of apcs statuscommand on a running cluster with one failed action.#
pcs statusCluster name: rhel75-cluster Stack: corosync Current DC: rhel75-node2 (version 1.1.18-5.el7-1a4ef7d180) - partition with quorum Last updated: Wed Nov 15 16:07:44 2017 Last change: Wed Nov 15 16:06:40 2017 by hacluster via cibadmin on rhel75-node1 2 nodes configured 14 resources configured (1 DISABLED) Online: [ rhel75-node1 rhel75-node2 ] Full list of resources: fencing (stonith:fence_xvm): Started rhel75-node1 dummy5 (ocf::pacemaker:Dummy): Stopped (disabled) dummy6 (ocf::pacemaker:Dummy): Stopped dummy7 (ocf::pacemaker:Dummy): Started rhel75-node2 dummy8 (ocf::pacemaker:Dummy): Started rhel75-node1 dummy9 (ocf::pacemaker:Dummy): Started rhel75-node2 Resource Group: group1 dummy1 (ocf::pacemaker:Dummy): Started rhel75-node1 dummy10 (ocf::pacemaker:Dummy): Started rhel75-node1 Clone Set: group2-clone [group2] Started: [ rhel75-node1 rhel75-node2 ] Clone Set: dummy4-clone [dummy4] Started: [ rhel75-node1 rhel75-node2 ] Failed Actions: * dummy6_start_0 on rhel75-node1 'unknown error' (1): call=87, status=complete, exitreason='', last-rc-change='Wed Nov 15 16:05:55 2017', queued=0ms, exec=20ms#
snmpwalk -v 2c -c public localhost PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterPACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterName.0 = STRING: "rhel75-cluster" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterQuorate.0 = INTEGER: 1 PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterNodesNum.0 = INTEGER: 2 PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterNodesNames.0 = STRING: "rhel75-node1" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterNodesNames.1 = STRING: "rhel75-node2" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterCorosyncNodesOnlineNum.0 = INTEGER: 2 PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterCorosyncNodesOnlineNames.0 = STRING: "rhel75-node1" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterCorosyncNodesOnlineNames.1 = STRING: "rhel75-node2" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterCorosyncNodesOfflineNum.0 = INTEGER: 0 PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterPcmkNodesOnlineNum.0 = INTEGER: 2 PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterPcmkNodesOnlineNames.0 = STRING: "rhel75-node1" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterPcmkNodesOnlineNames.1 = STRING: "rhel75-node2" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterPcmkNodesStandbyNum.0 = INTEGER: 0 PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterPcmkNodesOfflineNum.0 = INTEGER: 0 PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterAllResourcesNum.0 = INTEGER: 11 PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterAllResourcesIds.0 = STRING: "fencing" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterAllResourcesIds.1 = STRING: "dummy5" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterAllResourcesIds.2 = STRING: "dummy6" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterAllResourcesIds.3 = STRING: "dummy7" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterAllResourcesIds.4 = STRING: "dummy8" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterAllResourcesIds.5 = STRING: "dummy9" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterAllResourcesIds.6 = STRING: "dummy1" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterAllResourcesIds.7 = STRING: "dummy10" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterAllResourcesIds.8 = STRING: "dummy2" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterAllResourcesIds.9 = STRING: "dummy3" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterAllResourcesIds.10 = STRING: "dummy4" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterRunningResourcesNum.0 = INTEGER: 9 PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterRunningResourcesIds.0 = STRING: "fencing" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterRunningResourcesIds.1 = STRING: "dummy7" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterRunningResourcesIds.2 = STRING: "dummy8" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterRunningResourcesIds.3 = STRING: "dummy9" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterRunningResourcesIds.4 = STRING: "dummy1" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterRunningResourcesIds.5 = STRING: "dummy10" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterRunningResourcesIds.6 = STRING: "dummy2" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterRunningResourcesIds.7 = STRING: "dummy3" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterRunningResourcesIds.8 = STRING: "dummy4" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterStoppedResroucesNum.0 = INTEGER: 1 PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterStoppedResroucesIds.0 = STRING: "dummy5" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterFailedResourcesNum.0 = INTEGER: 1 PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterFailedResourcesIds.0 = STRING: "dummy6" PACEMAKER-PCS-V1-MIB::pcmkPcsV1ClusterFailedResourcesIds.0 = No more variables left in this MIB View (It is past the end of the MIB tree)
