Hi Eugen, No, as far as I can tell I only have one prometheus service running.
——— [root@cephman2 ~]# ceph orch ls prometheus --export service_type: prometheus service_name: prometheus placement: count: 1 label: _admin [root@cephman2 ~]# ceph orch ps --daemon-type prometheus NAME HOST PORTS STATUS REFRESHED AGE MEM USE MEM LIM VERSION IMAGE ID CONTAINER ID prometheus.cephman2 cephman2.classe.cornell.edu *:9095 running (12h) 4m ago 3w 350M - 2.43.0 a07b618ecd1d 5a8d88682c28 ——— Anything else I can check or do? Thanks, Devin On Jan 13, 2025, at 6:39 PM, Eugen Block <ebl...@nde.ag> wrote: Do you have two Prometheus instances? Maybe you could share ceph orch ls prometheus --export Or alternatively: ceph orch ps --daemon-type prometheus You can use two instances for HA, but then you need to change the threshold for both, of course. Zitat von "Devin A. Bougie" <devin.bou...@cornell.edu<mailto:devin.bou...@cornell.edu>>: Thanks, Eugen! Just incase you have any more suggestions, this still isn’t quite working for us. Perhaps one clue is that in the Alerts view of the cephadm dashboard, every alert is listed twice. We see two CephPGImbalance alerts, both set to 30% after redeploying the service. If I then follow your procedure, one of the alerts updates to 50% as configured, but the other stays at 30. Is it normal to see each alert listed twice, or did I somehow make a mess of things when trying to change the default alerts? No problem if it’s not an obvious answer, we can live with and ignore the spurious CephPGImbalance alerts. Thanks again, Devin On Jan 7, 2025, at 2:14 AM, Eugen Block <ebl...@nde.ag> wrote: Hi, sure thing, here's the diff how I changed it to 50% deviation instead of 30%: ---snip--- diff -u /var/lib/ceph/{FSID}/prometheus.host1/etc/prometheus/alerting/ceph_alerts.yml /var/lib/ceph/{FSID}/prometheus.host1/etc/prometheus/alerting/ceph_alerts.yml.dist --- /var/lib/ceph/{FSID}/prometheus.host1/etc/prometheus/alerting/ceph_alerts.yml 2024-12-17 10:03:23.540179209 +0100 +++ /var/lib/ceph/{FSID}/prometheus.host1/etc/prometheus/alerting/ceph_alerts.yml.dist 2024-12-17 10:03:00.380883413 +0100 @@ -237,13 +237,13 @@ type: "ceph_default" - alert: "CephPGImbalance" annotations: - description: "OSD {{ $labels.ceph_daemon }} on {{ $labels.hostname }} deviates by more than 50% from average PG count." + description: "OSD {{ $labels.ceph_daemon }} on {{ $labels.hostname }} deviates by more than 30% from average PG count." summary: "PGs are not balanced across OSDs" expr: | abs( ((ceph_osd_numpg > 0) - on (job) group_left avg(ceph_osd_numpg > 0) by (job)) / on (job) group_left avg(ceph_osd_numpg > 0) by (job) - ) * on (ceph_daemon) group_left(hostname) ceph_osd_metadata > 0.50 + ) * on (ceph_daemon) group_left(hostname) ceph_osd_metadata > 0.30 ---snip--- Then you restart prometheus ('ceph orch ps --daemon-type prometheus' shows you the exact daemon name): ceph orch daemon restart prometheus.host1 This will only work until you upgrade prometheus, of course. Regards, Eugen Zitat von "Devin A. Bougie" <devin.bou...@cornell.edu>: Thanks, Eugen. I’m afraid I haven’t yet found a way to either disable the CephPGImbalance alert or change it to handle different OSD sizes. Changing /var/lib/ceph/<cluster_id>/home/ceph_default_alerts.yml doesn’t seem to have any effect, and I haven’t even managed to change the behavior from within the running prometheus container. If you have a functioning workaround, can you give a little more detail on exactly what yaml file you’re changing and where? Thanks again, Devin On Dec 30, 2024, at 12:39 PM, Eugen Block <ebl...@nde.ag> wrote: Funny, I wanted to take a look next week how to deal with different OSD sizes or if somebody already has a fix for that. My workaround is changing the yaml file for Prometheus as well. Zitat von "Devin A. Bougie" <devin.bou...@cornell.edu>: Hi, All. We are using cephadm to manage a 19.2.0 cluster on fully-updated AlmaLinux 9 hosts, and would greatly appreciate help modifying or overriding the alert rules in ceph_default_alerts.yml. Is the best option to simply update the /var/lib/ceph/<cluster_id>/home/ceph_default_alerts.yml file? In particular, we’d like to either disable the CephPGImbalance alert or change it to calculate averages per-pool or per-crush_rule instead of globally as in [1]. We currently have PG autoscaling enabled, and have two separate crush_rules (one with large spinning disks, one with much smaller nvme drives). Although I don’t believe it causes any technical issues with our configuration, our dashboard is full of CephPGImbalance alerts that would be nice to clean up without having to create periodic silences. Any help or suggestions would be greatly appreciated. Many thanks, Devin [1] https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Frook%2Frook%2Fdiscussions%2F13126%23discussioncomment-10043490&data=05%7C02%7Cdevin.bougie%40cornell.edu%7C27dddfa00b2e4475b30e08dd342b82cc%7C5d7e43661b9b45cf8e79b14b27df46e1%7C0%7C0%7C638724083682129542%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=%2FrmKNJ1hVwWdQ5U05CvNXX1Df3f4SR2HAxTyZA3PJKw%3D&reserved=0<https://github.com/rook/rook/discussions/13126#discussioncomment-10043490> _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io<mailto:ceph-users@ceph.io> To unsubscribe send an email to ceph-users-le...@ceph.io<mailto:ceph-users-le...@ceph.io> _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
