Server Leftovers
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DHCP Server Conflict Detection
This blog title should really be, “Why you always, always, always want conflict detection turned on on all the networks MAAS touches,” but that’s really long as a title. But hear me out.
As promised, here is another DHCP blog, this time explaining how you can have multiple DHCP servers on the same subnet, serving overlapping IP addresses. There are a lot of network-savvy folks who will tell you that serving the same set of IP addresses from two different DHCP servers just won’t work. While that’s a really good rule to follow, it isn’t totally accurate under all conditions.
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DHCP scope
It’s possible to have more than one DHCP server on the same network and still have everything work right, with no conflicts and no dropped packets or IP requests. It’s really not that hard to pull together, either, but there are some things to know, and some things to consider before we investigate that situation. For this blog, we’ll put some of the overlooked facets of DHCP in bold text. Let’s take a look.
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LXD - Container Manager
I recently started working for InfluxData as a Developer Advocate on Telegraf, an open source server agent to collect metrics. Telegraf builds from source to ship as a single Go binary. The latest - 1.19.1 was released just yesterday.
Part of my job involves helping users by reproducing reported issues, and assisting developers by testing their pull requests. It’s fun stuff, I love it. Telegraf has an extensive set of plugins which supports gathering, aggregating & processing metrics, and sending the results to other systems.
Telegraf has a huge set of plugins, and there’s super-diverse ways our users deploy Telegraf, sometimes I have to stand up one-off environments to reproduce reported issues. So I thought I’d write up the basics of what I do, partly for me, and partly for my co-workers who also sometimes need to do this.
My personal and work computers both run Kubuntu 21.04. Sometimes issues are reported against Telegraf on other Linux distributions, or LTS releases of Ubuntu. In the past I’d use either VirtualBox or QEMU to create entire Virtual Machines for each Linux distribution or product I’m working with. Both can be slow to stand up clean machines, and take a fair chunk of disk space.
These days I prefer to use LXD. LXD is a system container manager, whose development is funded and led by Canonical, my previous employer. It’s super lightweight, easy to use and fast to setup. So it’s the tool I reach for most for these use cases.
Note that LXD can also launch Virtual Machines but I tend not to use that feature, preferring lightweight containers.[...]
I’ve been a big fan of LXD for some years now. I’ve found it a super fast, reliable way for me to spin up lightweight machines running random Linux distributions, and throw them away when done. It helps keep all those random and unstable pieces of software I’m testing nicely compartmentalised, and easy to nuke.
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Pentagon kills Microsoft’s $10B JEDI cloud contract, says tech is now outdated | Ars Technica
Amazon's legal stall tactics seem to have paid off.
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