Background In my recent posts I've been focusing on time synchronisation in virtual machines in public clouds. In my upcoming posts I'm going to cover how to apply the same techniques to improve time sync on generic KVM guests. Before we dive...
(Note: Readers who aren't familiar with time sync in public clouds might want to check out my recent series.) The AWS time sync service AWS first introduced their NTP-based time service in 2017 and it has been ticking along (pun fully intended)...
Contents It's About Time Prerequisites What is time synchronisation? Why should you care? What is good or bad, anyway? Technical terms Looking at time Frequency - an accurate clock Frequency - a clock which runs fast, consistently Frequency - a...
Contents Computer Timekeeping Time zones Types of clocks Hardware clocks Real Time Clock (RTC) System clock Clocks in action Bare metal Virtual machines Containers Time sync standards Network Time Protocol (NTP) NTP implementations NTP in action...
Contents The Part about Mister Cloud! AWS Services in scope NTP in AWS: initial configuration NTP in AWS: adjusting the defaults Which NTP servers? When is a second not a second? Leap second smearing Azure Services in scope NTP in Azure Local PTP...
Over the past few weeks I've made some changes to my NTP health monitor NTPmon, and I want to explain them more fully and outline the roadmap from here. 2.0.x series It was pointed out to me that it wasn't actually clear how to run NTPmon for...
An IPv6 addressing detour My next post about The Little Network That Could (TLNTC) was going to be about IPv6 addressing plans - and this post is definitely about IPv6 addressing - but before we can lay out a plan, there's something more...
(Yes, I know this is being published on April Fools' Day. I might be a fool, but this is not an April Fool's joke.) This year's model Platform teams and platform engineering are phenomenons which have taken the cloud native world by storm...
In keeping with my usual tradition of throwing in a random off-topic post every now and then, here is my favourite post-run meal, a banana/peanut butter/vanilla protein shake. When I get it just right, I think it's better than any thickshake I've...
Part 1: Even maildirs need their personal space I did a migration of my mail server over the last weekend and I ran into a strange error when I brought things back online. My system was receiving mail fine, but it was being deferred in the...