35,821 reputation
45497
bio website teaparty.net
location Cambridge, United Kingdom
age 47
visits member for 3 years, 10 months
seen 2 hours ago

What's to say? Check my personal website for a touch more detail, if you want to. I've been a professional UNIX/network sysadmin since 1991, and currently sysadmin free software professionally through my own little company. A long time ago, I and a co-author wrote "Building Linux and OpenBSD Firewalls" (Wiley, 2000). That's it.


4h
revised “No input file specified.” (I am stupid and deleted a user)
deleted 368 characters in body
5h
answered Postfix: validate recipients on remote server
6h
reviewed Close No Captive portal pop notification on android
7h
revised What happen if first rule of first iptable chain target is `RETURN`?
added 235 characters in body
7h
comment What happen if first rule of first iptable chain target is `RETURN`?
Neither. As it says above, the RETURN will do nothing at all, and the chain policy will take over. To find or set the chain policy, see my edit above.
11h
revised process zombifies while trying to connect on server then disappears
edited title
11h
answered What happen if first rule of first iptable chain target is `RETURN`?
11h
comment Authentication between several webserver with OpenId or Database
You could write a whole book on Single Sign-On, and others have done so. I'm sorry, but I find this question too broad for SF.
12h
comment MD RAID sector repair
Halfgaar, ah, OK, that's much clearer, thank you. SvW, as I read this, there really is a corner-case here: the HDD has a URE that could be remapped if only the drive knew what data should go in the remapped sector. It can't, but a RAID controller can (in certain RAID configurations), so the controller traps the URE and rewrites the failed sector to the failing HDD in such a way that the remap happens. I certainly agree that MD doesn't do this, but to be honest, I don't want it done. If any of my RAID drives is starting to return UREs, I want it out of my RAID.
12h
comment MD RAID sector repair
You said "the disk's firmware will reallocate the sector transparently"; that is not transparent remapping by the controller. I have probably misplaced a comma in my comment above, and should have said "That is not transparent remapping as you describe it, and it's not done by the HDD's firmware". The article, and your question, currently describe two different ways of dealing with UREs. Is that objection clearer?
12h
revised Authentication between several webserver with OpenId or Database
edited title
12h
comment MD RAID sector repair
That is not transparent remapping, and as you describe it it's not done by the HDD's firmware. Do you have any evidence of hardware controllers that do what you describe? The article you reference seems to claim this happens, but offers no model numbers or any other kind of documented proof.
12h
comment Private Nameserver not working properly with Godaddy domain registry
What IP address do you think you have published for markupchop.com? Is it 93.188.160.57?
12h
revised Private Nameserver not working properly with Godaddy domain registry
edited title
12h
comment MD RAID sector repair
Note what you've said above: the disk's firmware will transparently reallocate the sector. That happens irrespective of whether the HDD is talking to a motherboard controller or a hardware RAID controller. In short: the discs do that for you under both hardware and software RAID.
13h
revised inherit permissions on folders and subfolders by individual users & groups in linux ubunutu 12.04
edited tags; edited title
19h
comment Site-to-Site IPsec vpn not sending ping across a tunnel
Where are you PINGing from and to? Is either source, destination, or both, one of the tunnel endpoints?
1d
revised Apache dont response nothing on https
added 4 characters in body
1d
comment Unusual results returned by df, what caused it, how to fix?
Don't do this while the file system is mounted!
1d
comment Abnormal sendmail activity using up the server memory on my Ubuntu 12.04 server
The appearance of user www-data in the logs suggests that you may have a web form that's allowing people to send arbitrary content to arbitrary recipients. Do the dates on these messages correlate with anything in your web logs?