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Computing Dell HowTo TPM VMware

Set up TPM support in vCenter on Dell R7515

Quick HowTo/reminder to myself on how to activate TPM on ESXi hosts connected to vCenter. The smoothest way is to configure the servers before they are connected to vCenter: Otherwise they must be removed from the inventory and re-added. The BIOS security settings must be correctly configured: Select System Security. TPM Security must be turned […]

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Computing HowTo VMware

Fixing vSAN driver compatibility on Dell R7515

A while back, we purchased some vSAN Ready nodes for a new cluster. The machines came with ESXi installed in an all-NVMe configuration, but when setting up vSAN, Skyline Health kept complaining that the driver used for the write-intensive cache drives wasn’t certified for this purpose. I opened support cases with both VMware and Dell […]

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Computing HowTo Linux Postfix

Email address tags in Postfix and Dovecot

What if you could tag the mail address you provide when registering for various services to simplify the management of the inevitable stream of unsolicited mail that follows? If you could register myname+theservicename@mydomain.tld it would make it very easy to recognize mail from that service – and it would make it easy to pinpoint common […]

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Computing Exchange Server HowTo Microsoft Windows

Fixing “No DKIM keys saved for this domain” in EOP and Office365

Sometimes a newly added domain in Microsoft EOP will not let you enable DKIM from the web user interface. The only workaround I know of is to prepare the domain using PowerShell. To connect a PS session to O365, I use the following script, ripped straight from Microsoft’s documentation: After waiting for an eternity for […]

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Computing HowTo

SIP telephony behind a pfSense firewall

Background: When we got the fibre connection, I decided to use Bahnhof as our service provider. They enable a SIP phone connection at no extra cost, but they don’t support using third-party SIP boxes; you have to use their combined router/wifi AP/SIP converter (a box by Tilgin), which they manage for you. Naturally, since I’m […]

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Computing HowTo IPv6 KVM/QEMU Linux

IPv6 guests in KVM

I’ve been experimenting with IPv6 at home, and spent some time trying to get it working in my virtual machines. The first symptom I got was that VMs got a “Network unreachable” error when trying to ping6 anything but their own address. The cause was a complete brainfart on my side: We need a loopback interface […]

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Computing HowTo Linux

Frustrations in Ubuntu 18.04

My first frustration with Ubuntu 18.04 came yesterday. I created a template VM with my basic toolkit that any machine in my network should have. I then deployed the VM and asked vSphere to set the hostname to the value of the VM name. Strangely, this didn’t happen: The new machine booted up alright, but […]

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Computing HowTo Microsoft Windows

DNS/DHCP issues in modern Windows versions

Static IP addresses are a solid way to configure machines if you have few enough of them to manage them manually. But the more ability you want to have to change things on the fly, the more limiting such a configuration scheme becomes. Unfortunately I’ve had severe problems with getting servers with DHCP leases (or […]

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Computing HowTo Linux

Transport security with Postfix

I had a “Face: Meet Palm” moment today, and as usual when that happens, I learned something new: What happened was that I noticed that mail from a Postfix server I use for sending mail from a couple of domains was marked with the red “no encryption” label rather than the expected grey “standard encryption” […]

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Computing HowTo Linux

Resizing the system volume on a Linux VM

Background With LVM, the preferred way of adding storage space to a computer running a Linux-based operating system seems to be to add disks, judging by my search results. Naturally, this is a great way of minimizing disruption in a physical machine, but what if you’re running your machines virtually? Adding virtual disks tends to […]