Introduction As part of my travels and working with a large number of distributed linux systems we often need a better way to handle AAA(authentication, authorization and accounting), this wont help with 'accounting' but having a centralised machanisim to handle user sudo rights without requiring a 'phone home' …

Read More

NVIDIA H100 Models: Specifications and Use Cases If you have ever dealt with NVIDIA's top-end GPUs as part of your day-to-day work life, you'll have noticed there is more than one H100 (or perhaps you haven't!). The product naming scheme for these GPUs is super confusing, so I thought I'd consolidate some of my notes …

Read More

Here is my example Caddyfile for Openstack API's using Cloudflare DNS verification. I needed to build a custom Dockerfile Lazily I haven't used docker-compose, yet.. I will! 1docker run -it --rm -p5000:5000 -p 9696:9696 -p 9292:9292 -p 8774:8774 -p 8776:8776 -p 8778:8778 -p 9878:9878 -p 9511:9511 -p 8004:8004 -p …

Read More

On a particular customer's site, all of their HP servers are logging ACPI errors to syslog, filling the log and creating noise There is some discussion here https://community.hpe.com/t5/proliant-servers-ml-dl-sl/kernel-acpi-error-ae-not-exist-region-ipmi-region-powr-sb-pmi0/td-p/7179187 about a potential fix, but there …

Read More

In some scenarios I find sysylog being spammed with the following message vxlan: non-ECT from ADDRESS with TOS=0x2¶ I am unsure of the cause of this issue to date, I'm sure there is something going on that needs addressing here, but the syslog being filled with these errors isnt helpful Here I found some discussion …

Read More

It's not pretty but sometimes it has to be done Here is the set of commands I use to install Ceph MONs, MGRs or OSDs manually This came about becuase I was trying to use cephadm but the tool was broken for Ubuntu 22.04 at the time(Wouldn't bootstrap) so I did a package install using apt install ceph which pulled Quincy …

Read More

When using Gnocchi, if you have data thats stored in antiquated Farenheit format and need to convert into something modern day humans can use you can use Gnocchi's built in ability to perform 'operations' https://gnocchi.osci.io/rest.html#math-operations Assuming the formula to convert is TempC=(TempF-32)/1.8 then …

Read More

1#!/bin/bash 2################################################################################## 3# This script is used for synchronizing the RBDs (Rados Block Devices) between a 4# production Ceph cluster and a backup Ceph cluster. It checks whether the images exist in 5# the remote pool and creates them if not. It …

Read More

1echo "deb http://downloads.linux.hpe.com/SDR/repo/mcp stretch/current non-free" > /etc/apt/sources.list.d/hp-mcp.list 2 3wget -q -O - http://downloads.linux.hpe.com/SDR/hpPublicKey1024.pub | apt-key add - 4wget -q -O - http://downloads.linux.hpe.com/SDR/hpPublicKey2048.pub | apt-key add - 5wget -q -O - …

Read More

This script is a work in progress, fell free to reach out to me if you have any improvements. The idea is to leverage Ceph's snap differential export feature and Copy-On-Write snapshots\layers to allow for quick and easy snaps and exports of running VM volumes from one cluster to another. The obvious disclaimer about …

Read More