About this time last year I was unhappy with my website host, and happened to be Googling for new hosts (Google Ads can be pretty useful as long as you were intending to part with money anyway) when I came across the idea of virtual servers: that is, paying someone to run a process for you that behaves just like a little Linux machine.

The concept was just great for me, because I had this enormous list of specialised hosting requirements that started accruing way back when I was hosting for free on a server tucked away at Andrew’s work place. These requirements include something that no shared hosting provider gives out (multiple shell accounts) and stupid requirements like the ability to construct the infinite number of addresses with – signs in them that Andrew and I use for various purposes, mainly for sorting mail from online companies into different folders.

Anyway, the virtual servers appeared to have all the advantages of dedicated servers that I needed (root access with the usual powers minus kernel upgrades and driver fiddling) without the hassles of dedicated servers, which basically comes down to price and hardware maintainence.

Since then though, I’ve embarked on a round of server hopping the likes of which would make any Australian ADSL junkie proud.

A year in review:

Bytemark. These guys are pretty good. They have a simple little shell app where you can login into the host server, poke at your parasite server, reboot it, access the consoles and so on. You can also overwrite the whole thing with a new clean server. These applications are really useful and many virtual server hosts don’t have them. When they don’t, if your server disappears from the ‘net, you’re at the mercy of tech support, even if the host server is up. I switched away from them because they were in the UK and the delay when typing from Australia was annoying me. In retrospect: dumb.

JVDS. Random web pundit consensus seems to be that these guys have a pretty good deal on RAM, disk space, and whatnot. They seem to have the most recommendations. They had reasonably prompt user support. Unfortunately, we really needed it, because they messed up our server’s setup. Every time the host machine rebooted, someone else’s server would come up in place of ours. And this server, being where ours should be, would start receiving all our mail, and not recognising the addresses, rejected it all. Delayed mail not good, bounced mail bad. Further, we had no access to the host server and couldn’t check our machine’s status. So after the fourth time they promised and failed to fix the phantom server problem, we moved hosts again.

Redwood Virtual. These guys have an amazing deal on RAM which was why we went to them. Unfortunately they’ve had two major problems: consistent ongoing performance problems probably related to disk, and massive downtime. Like JVDS they don’t give you any access to the host server that’s useful when your parasite goes down, and unlike JVDS, they don’t have 24 hour support. It turns out they grew out of a bunch of friends who got a dedicated machine and some IP addresses and started playing around with UML.

Linode. I’m testing these people at the moment. While not a strikingly good deal on RAM or disk space, these guys have the most sophisticated host server management facilities I’ve seen. They’re the only host so far with an easy way to find out your bandwidth use. You can reboot and stop your parasite server. You can subdivide your disk space, reformat it, and reinstall at will. You can maintain different installations and switch between them. You can purchase extra RAM and disk space and have it added automatically. You can access your parasite host’s consoles. You can configure reverse DNS. And then, only if there’s something wrong with all of that, you can hassle tech support. Finally, although it’s possible my parasite server just is on a new machine, they seem to have good performance.

[Side note to Twisted people eager to promote one of their helpers: thanks, I’ve heard of However they’re relatively expensive and offer less disk space than I need.]

Linode isn’t all roses though.

First of all, they’re draconian about spam. I’m fine with “thou shalt not spam.” I’m less happy with “if you ever get us blacklisted we will charge you $250 an hour for the time it takes us to get un-blacklisted.” (Background story: I used to run a secondary mail server for Spammers, for various reasons, like to send spam via the secondary mail server. Hence, I was handling all of’s spam and forwarding it to them, as secondary servers are meant to do. One of their users noticed my server’s name in all his spams, and promptly got me in trouble with my provider, who was JVDS at the time. Moral of the story: it isn’t hard to falsely look like an open relay, and never secondary for someone who may have users who can read email headers but don’t know DNS.)

Second, as mentioned, they’re not the best deal on RAM and disk space. In particular, I probably am really pushing it trying to run a server under my current demand with 64MB RAM, especially as either Nevow or my Nevow app is a really memory hog. And, goddamn, memory usage needs to be a priority for virus and spam checkers. Amavis doesn’t even do any actual matching for me, it just hands off to clamav, and it still eats 6-10MB of memory.

Finally, nitpicking, their default Debian images have some weird problems, most noticeably not have localhost in /etc/hosts. I hope I’ve come across the majority of these now.

However, I am hoping that a week or two of testing (they’re already handling incoming mail for Andrew and myself) will show them to be sufficiently stable and agile to look at settling there for a while.