2010/1/8 Jonathan-David SCHRODER <jonathan.schro...@gmail.com> > Hello, > Please tell me if I'm replicating any initiative or doing something the > wrong or a not-so-good way. > > I've started this week from an EBS backed (or "boot") Ubuntu 8.04 image > ami-f6ad409f. > I agree to give the .pem file for ssh connection to an instance to anyone > willing to collaborate. > > My idea is to provide an EC2 EBS image with rails port(done) + tile > rendering setup(started) + rails port->tile rendering sync scripts(todo) + > easy config scripts (why not triggerable on startup with JSON config ala > tilecache.org) (todo, not sure I'll have time to it). > The list of commands to install is very long. I note down all the commands > I type so as to be able to one or more bash scripts to be able to reinstall > a similar solution on an Ubuntu N.NN later (by assuming that > commands/package names for 8.04 are similar to those for 9.04 etc..). Maybe > I'll have 3 bash scripts such as : install_railsport_u804.sh, > install_mapnik_u804.sh, install_railsport_mapnik_sync.sh. And I'd need other > scripts to go along : setup_rails_port_u804.sh, setup_mapnik_u804.sh and > setup_rails_mapnik_sync_u804.sh... > What do you think of this ? > > A recall on the requirements (reply to change them if you'd like to > collaborate or request something): > - postgres+osmosis+rails port (with 3 dbs : development, testing and > production) : filled with nothing for now. setup_rails_port_u804.sh would > have a simple calling syntax like : > sudo setup_rails_port_u804.sh [--bz2url= > http://domain/someRegion.osm.bz2|--bz2file=/path/to/file.osm.bz2<http://domain/someRegion.osm.bz2%7C--bz2file=/path/to/file.osm.bz2>] > [--forceResetDB (false if omitted)] > [--dbName=development(default),other,dbs,to,make,identical,too] > [--guessDBLoginPassFromRailsConfig (default is true)] > - mapnik tile rendering setup. I want to have a simple script to insert a > bz2 + tell to use some style sheets + to tell to render at z=N (max zoom) > - cron'able synced file making the Mapnik setup be filled with the Rails > ports's data. I plan to get inspiration from the myanmar scripts for this. > > I'm sorry to repeat this, though, please reply if you know of some linux > image (on EC2 or not) hanging somewhere which almost does what I'm trying to > achieve and that image is easy to redeploy (ex : .iso or vmware/virtual bos > EC2 ami). >
Well, one quick point: database performance are going to be bad. Someone is currently trying to do something similar in one of the mailing list. Cloud vendor are very good for serving content like a web page. They are extremely poor for database performance. The IO is usually catastrophic. I wouldn't expect any real good performance out of such a system especially for rendering. I think that using cloud technology is for the moment at least a bit pointless. Emilie Laffray
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