The status of the HA cluster
SNMP object: | SSB-SNMP-MIB::ssbHAClusterStatus |
Type: | String |
Community (v2c) / Context (v3) |
Data |
Short description: | Status of the HA cluster. |
Description: The status of the syslog-ng Store Box(SSB) cluster. For details, see Status.
For which systems and configurations is it applicable? | Only applicable for HA clusters. |
Value change frequency | When the HA cluster functions properly, this SNMP object should be in ha status in the majority of the cases. The rest of the status returned values (for example, degraded) may also occur occasionally, but the ha status should be dominant as a rule. |
Related issues and issue indicators | If while in a HA cluster, the status returned value is not ha or sync, the HA cluster is in degraded mode. |
Solution:
- Check your HA network.
- Reboot the Secondary node.
- Reboot the HA cluster.
- For technical assistance, contact our Support Team.
The status of the Redundant Heartbeat interface
SNMP object: | SSB-SNMP-MIB::ssbHARedundantHeartbeatStatus |
Type: | String |
Community (v2c) / Context (v3) |
Data |
Short description: | Status of the Redundant Heartbeat interface. |
Description: The status of the Redundant Heartbeat interface. For details, see Redundant Heartbeat status.
For which systems and configurations is it applicable? | Only applicable for HA clusters, but it only has a returned value if Redundant HA is configured. |
Value change frequency | When the cluster functions properly, it should be in ok returned value status in the majority of the cases. The rest of the status returned values (for example, degraded) may also occur occasionally, but the ok status should be dominant as a rule. |
Related issues and issue indicators | Sometimes this SNMP objects has an ok status, but the HAClusterStatus is not ok. The HA cluster will function properly in this case, too. |
The synchronization progress of HA nodes
SNMP object: | SSB-SNMP-MIB::ssbHASynchronizationProgress |
Type: | Integer32 (0..100 %) |
Community (v2c) / Context (v3) |
Data |
Short description: | HA cluster synchronization progress (in percent). 100%, if the cluster is fully synchronized. |
Description: This value can be important in the following cases:
-
When enabling HA mode the first time, after navigating to Basic Settings > High Availability and clicking Convert to Cluster, the synchronization process starts. This value will start at 0% and will gradually increase to 100%. When it reaches 100%, it means that the conversion has been finished and the nodes are now in HA status.
-
If one of your nodes becomes unavailable and you decide to reinstall SSB, you will have to rejoin your cluster again by navigating to Basic Settings > High Availability and clicking Join HA. This will start the synchronization progress from 0% again and will gradually increase to 100%. When it reaches 100%, it means that the join progress has been finished and the nodes are now in HA status again.
-
If a node becomes unavailable for a longer period and then gets joined again, it can be possible that the configuration of the two nodes become different. In this case, the two nodes start the synchronization process again so that the new changes are transferred to the previously unavailable node. This does not necessarily mean that the synchronization value will start at 0%, it is possible that it starts from a number somewhere between 0% and 100%.
For which systems and configurations is it applicable? | Only applicable for HA clusters. |
Value change frequency | Following a conversion to a HA cluster, its returned value continuously increases till reaching 100%. After reaching 100%, its returned value rarely changes - or does not change at all. |
Related issues and issue indicators | When 100% has not yet been reached, but the process still does not change for a long time. |
Solution:
- Check your HA network.
- Reboot the Secondary node.
- Reboot the HA cluster.
- For technical assistance, contact our Support Team.
Determining whether the HA node is the primary node
SNMP object: | SSB-SNMP-MIB::ssbHAIsPrimary |
Type: | TruthValue (SNMP boolean value) |
Community (v2c) / Context (v3) |
System |
Short description: | The current HA node is the primary node |
Description: This information is only supplied on HA-cluster nodes and it is available on the SNMP community provided by the boot-firmwares (the ID-based communities on the Basic Settings > Monitoring > SNMP agent settings page).
You can monitor which node is the primary HA node, that is, which node is responsible for SSB's business logic. For example, HTTP configuration, log management (syslog-ng, archive, backup), and so on.