Centroid.EU Blog

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News from Goldflipper

February 2nd, 2019

What is Goldflipper doing these days? Have a look.

Such a goldy!


Purchased 3 books from Amazon

January 31st, 2019

  • Inside Windows Debugging: A Practical Guide to Debugging and Tracing Strategies in Windows - Tarik Soulami
  • Windows Internals, Part 1 - Pavel Yosifovich et al.
  • Troubleshooting with the Windows Sysinternals Tools - Mark Russinovich
I paid premium delivery because I didn't want to wait around on saturday for the books to arrive, they'll be delivered friday. Next time I buy books it should be earlier in the week.


Delphinusdnsd now uses control sockets instead of pidfile

January 30th, 2019

Running delphinusdnsd twice or three times at a time on a single host (but different ports) has always been pretty hard as there was some confusion to the pidfiles. I tried to solve this with a control socket that is controllable via dddctl. Stopping and restarting delphinusdnsd should now work well, you can start it too but are only limited to 2 argument options (-s and -f) to a start. -s is specifying the path to a socket and -f specifies the config file to use. I know I'll enjoy this very much.


Cut 12% from delphinusdnsd.c of delphinusdnsd

January 26th, 2019

Yesterday I was in a coding mood. I didn't have much time, but this is the diff I came up with. I touched code that was close to 15 years old and removed it! I'm very proud of this feat! It wasn't really bad, code but it could have been compacted a lot more, that's what I did. The result may be a bit slower for answers in delphinusdnsd, but the code is a lot more manageable/readable.


Deleted VPS upsilon.virgostar.net

January 24th, 2019

It never did much, and was last used as a testbed for testing opensmtpd configs. But. It will be missed. Thank you upsilon. Now that I have red, green and blue at hetzner online which are in nuremberg, falkenstein and helsinki respectively I'm set for the future on these. I still have to rename tau.virgostar.net to blue completely right now it only exists as DNS forward entry. But that'll be done another time.


Activated green.centroid.eu vps

January 23rd, 2019

It is located at hetzner in falkenstein, which is a location I haven't yet used I don't think. I'm going to make green the new webserver instance, and I'll use this and next week to copy everything over. The vps is the same spec as red.centroid.eu: 2 GB RAM, 20 GB disk, 20 TB traffic, for 2.96 EUR/mo.


OpenBSD on Hyper-V on Windows 10 (pro)

January 22nd, 2019

I must..have..OpenBSD :-). So I have put it emulated in HyperV which comes with Windows 10 Pro. Have a look!

And a dmesg from inside the OpenBSD guest:

OpenBSD 6.4-current (GENERIC) #532: Thu Jan  3 02:36:48 MST 2019
real mem = 1056899072 (1007MB)
avail mem = 1015541760 (968MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.3 @ 0xf93c0 (338 entries)
bios0: vendor American Megatrends Inc. version "090007" date 05/18/2018
bios0: Microsoft Corporation Virtual Machine
acpi0 at bios0: rev 0
acpi0: sleep states S0 S5
acpi0: wakeup devices
acpitimer0 at acpi0: 3579545 Hz, 32 bits
acpihve0 at acpi0
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i3-2120 CPU @ 3.30GHz, 2575.80 MHz, 06-2a-07
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 156MHz
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins, remapped
acpiprt0 at acpi0: bus 0 (PCI0)
acpicpu0 at acpi0: C1(@1 halt!)
acpipci0 at acpi0 PCI0: _OSC failed
acpicmos0 at acpi0
"VMBus" at acpi0 not configured
"Hyper_V_Gen_Counter_V1" at acpi0 not configured
pvbus0 at mainbus0: Hyper-V 10.0
hyperv0 at pvbus0: protocol 3.0, features 0x2e7f
hyperv0: heartbeat, kvp, shutdown, timesync
hvs0 at hyperv0 channel 2: ide, protocol 6.2
scsibus1 at hvs0: 2 targets
sd0 at scsibus1 targ 0 lun 0:  SCSI3 0/direct fixed \
sd0: 16384MB, 512 bytes/sector, 33554432 sectors, thin
hvn0 at hyperv0 channel 14: NVS 5.0 NDIS 6.30, address 00:15:5d:02:0a:00
hvs1 at hyperv0 channel 15: scsi, protocol 6.2
scsibus2 at hvs1: 2 targets
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 82443BX" rev 0x03
pcib0 at pci0 dev 7 function 0 "Intel 82371AB PIIX4 ISA" rev 0x01
pciide0 at pci0 dev 7 function 1 "Intel 82371AB IDE" rev 0x01: DMA, channel \
0 wired to compatibility, channel 1 wired to compatibility
pciide0: channel 0 disabled (no drives)
atapiscsi0 at pciide0 channel 1 drive 0
scsibus3 at atapiscsi0: 2 targets
cd0 at scsibus3 targ 0 lun 0:  ATAPI 5/cdrom \
cd0(pciide0:1:0): using PIO mode 4, DMA mode 2
piixpm0 at pci0 dev 7 function 3 "Intel 82371AB Power" rev 0x02: SMBus disabled
vga1 at pci0 dev 8 function 0 "Microsoft VGA" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
isa0 at pcib0
isadma0 at isa0
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vscsi0 at root
scsibus4 at vscsi0: 256 targets
softraid0 at root
scsibus5 at softraid0: 256 targets
root on sd0a (6782db52fad2d25a.a) swap on sd0b dump on sd0b
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
fd1 at fdc0 drive 1: density unknown

This is awesome! I have recovered some respect for Windows. And hats off for people like MikeB at OpenBSD who made this work!


The 480 byte message that caused 1.2MB+ to exit my network

January 21st, 2019

I wrote a small message to openbsd-misc (this one). In the process of doing so it cost me 1.2 MB to exit my network in NXDOMAINS that get logged per query on my nameserver.

It turns out whenever I mail to the list, my domain name "centroid.eu", gets incepted at the remote nameservers when the remote mail servers who receive my mail ask for a dmarc and DKIM signature. I have known about this a long time now, but I decided to blog about it today.

I get about 3000+ queries per mail on omega, which is the only nameserver out of two that logs queries for centroid.eu lookups. Since centroid.eu is DNSSEC protected the NXDOMAINS do an NSEC3 proof of nonexistance which is up to 600 bytes per answer.

It doesn't anger me, but I'm wondering if there is a more silent way of posting to OpenBSD-misc?


Electricity for 2018

January 21st, 2019

I got my electricity bill for 2018. Better for the environment, worse on my wallet is the trend here.


Electricity is down by a whole 1000 KWh, this is what I wanted to achieve, however it spiked in day use which is more expensive for me. Sadly for me it cost 50 EUR more for the year which they'll deduct from my bank account.

So what has changed in this household? Other than no freifunk (which really didn't take up much electricity) I can't think of much. I possibly found the trick to using the electric heating system better, which caused savings. I dunno. 1000 KWh are a big difference...


Planning on dumping 6 domain names, keeping 4

January 19th, 2019

I'm planning on dumping everything but these domain names:

  1. centroid.eu
  2. delphinusdns.org
  3. dtschland.eu (will remain a test zone)
  4. unspecified hosted domain name
What this means is that by July 2020 the others will all be expiring. 5 of the 6 are actually .de domain names and I'm saving quite a bit by not renewing. I view it all as a trimming the fat or consolidation effort. Since dtschland.eu was gotten a few years ago for 10 years I don't have to renew it but the other 3 I'm going to renew for two years or so.

To help with this effort I'm also going to be getting three new vps's and retiring two. The remaining I'm going to rename.

  • phi.virgostar.net -> red.centroid.eu
  • tau.virgostar.net -> blue.centroid.eu
The new VPS's I have already fixed at green.centroid.eu, vertex.centroid.eu, and triangle.centroid.eu. This means I'm giving up my previous naming scheme this is ok. I'm not going to have a scheme right now and just name stuff whatever I feel like. Since everything is based off virgostar.net right now I'm going to have to rename the nameservers. I hope to be finished by november with all this work.


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