Comments for Svoccblog

Comment on Strange iptables error with kernels >= 2.6.32 – solved by Patrick

Patrick — Sat, 07 Jan 2012 19:52:43 +0000

Was just what I was looking for. It helped thanks!

Comment on CPU feature flags and their meanings by Gawain's Jail - MB990的CPU型号

Gawain's Jail - MB990的CPU型号 — Mon, 07 Nov 2011 02:58:39 +0000

[...] 这些特性码可以参考CPU feature flags and their meanings这篇文章。 [...]

Comment on CPU feature flags and their meanings by QEMU – KVM ile Sanallaştırma İpuçları « Linux Sistem Yönetimi – Ağ Güvenliği

Tue, 01 Nov 2011 19:42:23 +0000

[...] Sanal makinenize host platformdak işlemcinizi gösterirken birçok seçeneğiniz mevcut. En basiti ise cpu -host parameteres ile host işlemcinin tüm özelliklerini suya sabuna dokunmadan vermek. Yok eğer simule etmek istediğiniz bir işlemci türü var ise ve sadece bu işlemcinin yapısal özelliklerini vermek istiyorsanız elbette en detaylı biçimde bunuda yapabilmenize olanak var. Genel olarak bilmeniz gereken sanal makinenize smp değeri ile vereceğiniz (simulated processor) değerin “thread” sayınız ile olması. cpu sayısı değil core sayısıda değil her core a düşen thread ayısı ile işlemci sayısını vermeniz gerekiyor. örneğin çift işlemcili ve her işlemcisinde 4 core olan bir host unuz var ise thread sayınız (hyperthreading ile) toplamda 16 dır. sanal makinenize smp değerini bu 16 sayısını düşünerek paylaştırınız. yok ben paranoyağım cpu umun her özellğini /proc/cpuinfo dan görüp sadece istediğim flagları vermek istiyorum diyorsanız işte flagler ve anlamları. http://blog.incase.de/index.php/cpu-feature-flags-and-their-meanings/ [...]

Comment on Strange MySQL (5.0) issue with authentication by sven

sven — Thu, 13 Oct 2011 12:05:26 +0000

Problem is that the same server accepted a connection from the other host fine. And user ” host=’localhost’ doesn’t match ‘sven@a0.my.do.main’, and (sven@)’%.my.do.main’ is more specific then (”)@’%’.

As said, both servers are completely set up the same (including /etc/hosts, I just verified that) except for the differences needed (IP address .11 on a1, .10 on a0).

If specificity would hit here, it should either happen from both clients or from none of them. Also, connecting from a third host (which works nicely in all tested setups) should also hit that specificity issue.

Anyhow, I can’t reproduce the problem anymore. But I’m still open for ideas.

Comment on Strange MySQL (5.0) issue with authentication by Alex Hudson

Alex Hudson — Thu, 13 Oct 2011 11:02:53 +0000

Taking a guess based on your second update, you’re being bitten by specificity.

If you have user table entries with hosts using wildcards (‘%’ etc), they will be treated less preferentially. So, if your connecting client potentially matches more than one of the entries in there for some reason, it will pick the one with the most specific host – even if the user is less specific.

So, user=” host=’localhost’ (for example) will win over user=’sven’ host=’%.wherever’, if you’re connecting from localhost.

Given you said removing the anon entries “made it work”, I think this is the reason. It probably doesn’t totally answer “why” – I’m assuming that your other host is matching a number of entries in there for reasons not totally clear; could be your /etc/hosts or something.

Comment on Strange MySQL (5.0) issue with authentication by sven

sven — Thu, 13 Oct 2011 10:19:42 +0000

Yes, that was just a typo while converting from my (confidential) internal names to something I could post. (Fixed)

Comment on Strange MySQL (5.0) issue with authentication by macno

macno — Thu, 13 Oct 2011 10:02:45 +0000

When you try to connect from a0 to a1.my.do.main , error output is “my-a1.my.do.main”. Why? is it just a typo?

Comment on Strange MySQL (5.0) issue with authentication by sven

sven — Thu, 13 Oct 2011 09:26:16 +0000

Hi everyone, thanks for the comments, I updated the post accordingly.

Comment on Strange MySQL (5.0) issue with authentication by Chris Hiestand

Chris Hiestand — Thu, 13 Oct 2011 09:12:47 +0000

Also check that the forward and reverse DNS for both hosts are resolving okay from eachother.

Comment on Strange MySQL (5.0) issue with authentication by Chris Hiestand

Chris Hiestand — Thu, 13 Oct 2011 09:10:33 +0000

I don’t know the answer but I’d do 3 things in order:
1. Try looking at the mysql (I mean the actual database named mysql) db and user tables and make sure the values are what you’d expect
2. Check your ~/.my.cnf to see if something might be wrong there.
3. Post this question up on serverfault.com

Also copying over the database files on the filesystem layer doesn’t really seem like a good idea, although I’m not expert enough to say that definitively.

Comment on Strange MySQL (5.0) issue with authentication by Poisonbit

Poisonbit — Thu, 13 Oct 2011 08:36:03 +0000

Maybe about direct/reverse DNS entries?

It’s hard to guess it, but maybe it’s DNS, or IPv4 Vs IP6….

There is a sql statement “FLUSH HOSTS;” or “mysqladmin flush-hosts”.

Good luck.

Comment on blood donations by nicola johnson

nicola johnson — Mon, 28 Feb 2011 08:35:12 +0000

France !!!
Ive been living in france for nearly ten years and have not been able to give blood because i lived in england when the mad cow disease was around !!!
In england i could give blood, and it makes me really angry that for ten years i havent been able to give. I cant afford to go back to england to do it, but its very important for me to donate my blood.

Comment on Apache SSL oddity by hynek

hynek — Wed, 06 Oct 2010 10:11:09 +0000

Thank you sven. I was struggling with that for alost a day, until I found you article.
I’ve got server in DMZ, which is pure HTTPS and has the different domain names to Internet and to internal network, meaning two different certs also.

Appreciate it very much, now working for me correctly.
Thanks, Hynek

Comment on CPU feature flags and their meanings by Specifiche della propria CPU | Pcc8 Technology

Specifiche della propria CPU | Pcc8 Technology — Thu, 23 Sep 2010 18:49:25 +0000

[...] Hyper-Threading. An Intel technology that allows quasi-parallel execution of different instructions on a single core. The single core is seen by applications as if it were two (or potentially more) cores. However, two true CPU cores are almost always faster than a single core with HyperThreading. This flag indicates support in theCPU when checking the flags in /proc/cpuinfo on Linux systems. For more info how you can detect active HyperThreading, see the first comment in my blog post about this page at [2] [...]

Comment on CPU feature flags and their meanings by Linux Tips « Lokah Samastha Sughino Bhavantu

Linux Tips « Lokah Samastha Sughino Bhavantu — Mon, 23 Aug 2010 22:28:38 +0000

[...] In the above listing the flat “lm” means, Long Mode. (64bit Extensions, AMD’s AMD64 or Intel’s EM64T). For more information on CPU flags look at CPU feature flags and their meanings [...]