A complex system that works is invariably found to have evolved from a simple system that worked…A complex system designed from scratch never works and cannot be patched up to make it work. You have to start over, beginning with a working simple system.
Tag: system
clusterssh
For reasons which might be fairly obvious, I’ve been doing a lot of repetitive sshing to machines recently (think executing the same upgrade on four mail servers for instance). I pondered aloud in the cube the possibility of an application which would give me a dialog to type in, and then wack that text into a bunch of xterms all at the same time for me. Andrew did some Debian foo and suddenly cluster ssh is presented as an option. It’s pretty cool, and basically does exactly what I wanted.
It’s not perfect though — some people have complained that it uses gnome-terminal, and about the fonts of all things. I’ve noticed some odd behaviour if you try to cut and paste into the gnome-terminal as well (instead of the text entry dialog). Interesting, I think it might be time for me and the cluster ssh code to become acquainted sometime.
Trying out the Apress e-book system
Full disclosure: I am currently writing a book for Apress.
As an Apress author Apress asked me to check out the Apress e-book online catalog thingie. They threw in a free e-book as an incentive, so I thought I should give it a try. I’ve done a fair few book reviews for AUUG / Woodslane over the last couple of years, so it seemed like a good idea to look further into this e-book thing anyway. Especially as I have a garage full of books that I occasionally need as references, but don’t have the space to store in the house, especially with two small kids who like to draw in books around.
So, I picked a book in their online catalog, and said I’d like to buy it. I entered the discount code, and was good to go until they noticed that I didn’t have an online account in their system. So, I had to stop my “purchase” and make one. Which meant that my place was lost in the purchase, as I had to wait for a confirmation email to arrive, and then click on a link in that email which didn’t have the stage I was up to embedded into it.
The email by the way set off my somewhat aggressive spam filtering, by not having any of my addresses in the delivery headers. I had to go digging in the probably spam folder to find it. You can read about my mail list filtering rules over here if that kind of thing excites you.
So a couple of warts. After all of this I went and found the book again, entered the discount code, and “bought the e-book”. What this gives me is an entry in the list of books I have access to on the Apress site, which means I can download the e-book more than once (if for instance I delete it in error or something). The book is a PDF file, with the slightly annoying name of “book143.pdf”. The book in question is quite long, and is about a nine megabyte download.
Oh, all of this webby stuff was with Firefox on Debian Linux, which all worked fine. The PDF file opens fine with xpdf, with a password on the file which matches the email address I signed up with. This just means that you need to remember the email address that you used when you signed up with Apress, which seems reasonable in a world with fairly permanent email addresses now. It also means that if I put the e-book up on kazaa or something, that they can tell which account did it I suppose.
xpdf seems to think that printing works by the way, although I don’t have a printer configured to actually test with.
Overall, I think it’s quite good. The e-book was very cheap ($15 US if I’d paid), I can download it lots, I don’t have to remember a crappy password, and the PDF doesn’t seem too crippled. Cool.