#arpnetworks 2009-09-19,Sat

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Who	What	When
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ballen	up_the_irons: are you doing authentication in your Sinatra app?	[12:26]
up_the_irons	ballen: no	[12:40]
ballen	hmm looking for the best auth lib for Sinatra	[12:41]
up_the_irons	yeah, dunno up_the_irons reads scrollback	[12:41]
ballen	one that I can rip apart and make it work on a key/value db	[12:41]
up_the_irons	mhoran: ballen: I could hotplug a drive, sure, but it'll look like USB. Would rather attach it permanently ballen: mhoran: KVM supports memory ballooning	[12:44]
ballen	ah, was just thinking of a case where running a site that couldn't be brought down and running out of storage	[12:44]
up_the_irons	ballen: for a live migration, the host and target must be running the exact same VM parameters	[12:44]
ballen	yea I figured that out after I said it	[12:45]
up_the_irons	ballen: it doesn't make sense for the HD to be larger anyway, b/c all live migration implementations require the disk to actually be shared (same disk)	[12:45]
ballen	ah right bleh be so much easier than designing an app to be able to migrate live across servers	[12:46]
up_the_irons	mhoran: ballen: I'm working on live migrations across regions as well (first step: migrate into a different data center within the same city, then try into a different metro region)	[12:47]
ballen	thats hot	[12:49]
up_the_irons	the hardest part, actually, i just getting the live migration from machine to machine; once that is done, data center to data center is not that hard, b/c if it is seen as the same network anyway, the servers don't care that they are in the same cabinet 2 ft away, or thousands of feet away	[12:50]
ballen	right	[12:50]
up_the_irons	fyi, you wouldn't use a single VM for a site that couldn't experience a lot of downtime, that'd be scaling vertically; which is generally bad. if your site really can't be down, you'd build a cluster for it	[12:51]
ballen	yes yes just alot easier to program for scalling vertically but much more expensive	[12:51]
up_the_irons	sure, cause we've all grown up programming for vertical platforms we're "used" to it	[12:52]
ballen	yea	[12:53]
up_the_irons	i imagine the next generation will have an easier time w/ clustering, or building an app that scales horizontally	[12:53]
ballen	I hop so hope* assuming education adapts which it is normally slow todo	[12:53]
up_the_irons	most coders don't learn their chops through formal education anyway though i didn't either but i still stayed in school	[12:54]
ballen	yea likewsie likewise	[12:54]
up_the_irons	cuz it's important on so many levels :)	[12:54]
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ballen	http://gist.github.com/40246 If i rip datamapper out and replace it with Redis goodness that'll due	[12:57]
up_the_irons	looks promising	[12:59]
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up_the_irons	i hate rspec i used to like it, but now, i fucking hate rspec it won't run any specs nothing nada just returns to the prompt silently	[13:51]
mhoran	up_the_irons: Cool, cool and cool.	[13:57]
up_the_irons	heh	[13:57]
mhoran	They're building out some cool clusters at my alma mater. There's actually one there now which just idles. Unfortunate. But there's a new prof working in bioinformatics, they had to buy a new CRAC unit to accomodate his cluster. Pretty exciting. They also were planning to hire a dedicated cluster sysadmin, but I think they ran out of money. Unfortunately, all but two people on that staff, including the manager, are idiots.	[13:58]
up_the_irons	cool, and not cool cd $food	[14:11]
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ballen	http://ohm.keyvalue.org/ only the most freaking cool library ever going to save me sooo much time on this project	[23:27]
up_the_irons	ballen: nice	[23:37]
ballen	don't have to figure out all my key/value schema now even though I already do have that figured out it'll take less code now also trying to get authlogic to work with Sinatra	[23:37]
up_the_irons	is what you're building online anywhere?	[23:39]
ballen	nah just starting to plan it out really should be working on my thesis but meh	[23:40]
up_the_irons	haha	[23:42]
ballen	seems like authlogic depends on active_record a little bit which sucks	[23:43]
up_the_irons	eeeww f that	[23:43]
ballen	yea so I may just stick with home brew auth for now and build it out if needed	[23:44]
up_the_irons	ballen: so does this Ohm basically let you store ruby objects inside Redis?	[23:44]
ballen	umm its basically lets you work with models as you would in Rails	[23:44]
up_the_irons	gotcha	[23:45]
ballen	class User < Ohm::Model attribute :login end now the User model has an login attribute when you save the model you can only access it by id say you want to access it by login you add index :login now you can do User.find(:login, 'name') index creates a Set where attribute is just a single hash in the db also could add something like set :admins, Admin and now you'd have @user.admins	[23:45]
up_the_irons	interesting	[23:49]
ballen	similar to rails all its doing its creating new sets in the backgroud so it can index the data in a way that lets you search for it so each time you add an index or set its add a decent amount of duplicate db to db duplicate data to the db* but such is life with key/value db's	[23:49]
up_the_irons	right so like "index :login", creates a key that is "login" with value that is an id, that then let's you look up "User"	[23:51]
ballen	exactly theres also list and counter	[23:52]
up_the_irons	ah	[23:53]
ballen	list is not indexable either FIFO, FILO, etc counter is just a serial data type cool thing about counters in redis is that they're atom, you don't have to worry to much about multiple clients incr or decr	[23:53]
	SHA512 enough for password hashing?	[23:59]

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