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diff --git a/monitoring/snmp/README.md b/monitoring/snmp/README.md new file mode 100644 index 000000000..1a5b60955 --- /dev/null +++ b/monitoring/snmp/README.md @@ -0,0 +1,54 @@ +# SNMP schema +To show the [OID](https://en.wikipedia.org/wiki/Object_identifier)'s supported by the MIB, use the snmptranslate command. Here's an example: +``` +snmptranslate -Pu -Tz -M ~/git/ceph/monitoring/snmp:/usr/share/snmp/mibs -m CEPH-MIB +``` +*The `snmptranslate` command is in the net-snmp-utils package* + +The MIB provides a NOTIFICATION only implementation since ceph doesn't have an SNMP +agent feature. + +## Integration +The SNMP MIB is has been aligned to the Prometheus rules. Any rule that defines a +critical alert should have a corresponding oid in the CEPH-MIB.txt file. To generate +an SNMP notification, you must use an SNMP gateway that the Prometheus Alertmanager +service can forward alerts through to, via it's webhooks feature. + + + +## SNMP Gateway +The recommended SNMP gateway is https://github.com/maxwo/snmp_notifier. This is a widely +used and generic SNMP gateway implementation written in go. It's usage (syntax and +parameters) is very similar to Prometheus, AlertManager and even node-exporter. + + +## SNMP OIDs +The main components of the Ceph MIB is can be broken down into discrete areas + + +``` +internet private enterprise ceph ceph Notifications Prometheus Notification + org cluster (alerts) source Category +1.3.6.1 .4 .1 .50495 .1 .2 .1 .2 (Ceph Health) + .3 (MON) + .4 (OSD) + .5 (MDS) + .6 (MGR) + .7 (PGs) + .8 (Nodes) + .9 (Pools) + .10 (Rados) + .11 (cephadm) + .12 (prometheus) + +``` +Individual alerts are placed within the appropriate alert category. For example, to add +a notification relating to a MGR issue, you would use the oid 1.3.6.1.4.1.50495.1.2.1.6.x + +The SNMP gateway also adds additional components to the SNMP notification ; + +| Suffix | Description | +|--------|-------------| +| .1 | The oid | +| .2 | Severity of the alert. When an alert is resolved, severity is 'info', and the description is set to Status:OK| +| .3 | Text of the alert(s) | |