by Pawel | Mar 31, 2019 | monitoring, prometheus, sysadmin
You are probably familiar with the awesome Prometheus Blackbox Exporter. The exporter works great for monitoring availability of ICMP, HTTP(S), TCP and DNS targets. That said, when monitoring websites, I have found that it would be very helpful to provide insight as...
by Pawel | Dec 23, 2018 | monitoring, prometheus, sysadmin
Prometheus has a lot of exporters available. Sometimes, however, you may want to export data to Prometheus as quickly as possible. I have given it some thought and came up with a rather brutish approach to delivering metrics, which, to my surprise, performs quite...
by Pawel | May 17, 2018 | sysadmin, virtualization
Setting up KVM guests manually with an install ISO is suffering. Here's an example way of templating KVM guests by hand. NB: There are many ways this can be achieved with tools like virt-clone, so think of this as a more hands-on approach for learning. The...
by Pawel | Apr 27, 2018 | monitoring, prometheus, sysadmin
Prometheus. A Time Series database that is aimed at storing metrics. I'm going to be giving you a quick start on getting it running without digging too deep into how it works (it'd be no fun exploring it if I just explained everything, right?). As always, please see...
by Pawel | Apr 6, 2018 | ceph, sysadmin
It is not possible to take advantage of NVMe SSD bandwidth with single OSD. 4 is the optimum number of partitions per SSD drive that gives best possible performance.http://tracker.ceph.com/projects/ceph/wiki/Tuning_for_All_Flash_Deployments#NVMe-SSD-partitioning Ceph...
by Pawel | Apr 1, 2018 | ceph, sysadmin
All Ceph cluster administrators have probably already faced some level of disruption caused by deep scrubbing. Deep scrubs are ruining the performance for my clients! Should I disable them? Hold on a minute, let's make sure we understand what a scrub and deep scrub...
