Very nicely explained! I was actually hoping to use Amazon RDS with postgresql. Your help was very useful. Thank you!
On Sat, Mar 1, 2014 at 3:03 PM, Russell Keith-Magee <russ...@keith-magee.com > wrote: > Hi Robin, > > In the simplest deployment case, your entire Django (or, for that matter, > any other framework) website will run on a single server. That single > server will contain the web server, the database, any files that have been > uploaded, any any other services your site needs (such as memcache, a mail > server, or anything else) > > Amazon EC2 is essentially selling you "a server". So, if you spool up a > single EC2 instance, you could install all the bits you need to run your > site on that single server. > > If you're using autoscale and elastic load balancer, what you're getting > is the ability to spool up new web servers as traffic increases. > > However, when you move to having more than one server, you have a problem. > What do you do with your database? No matter how many web servers you have, > your application still needs to have a *single* database. > > Django's syncdb command is the step of creating the database schema (i.e., > the collection of tables) that your application will run. You should only > be running it once for your application -- on the single database. > > If you're setting up load balancing and autoscaling for your web app, you > have three options for your database. > > Firstly, you can set up a *separate* EC2 instance for your database. The > idea here is that you would have multiple small EC2 instances serving web > traffic (scaling up and down as required), but a single large EC2 instance > running your database. > > Secondly, if you're looking for redundancy, you might set up *multiple* > large EC2 instances for your database, and link them in a master-slave > configuration. This provides some redundancy (in case one of the database > servers goes down), and also provides some load balancing capability. > Again, these instances are independent of your web server instances, and > aren't affected by any load balancing behaviour. > > Thirdly, and probably the best option if you're looking to deploy on > Amazon - use Amazon RDS. This is Amazon's autoscaling > database-as-a-service. You create a database on RDS, and get charged for > how much data you store, and how much you serve. Amazon worries about > scaling, backup, and all the rest. > > In any of these three cases, you only run syncdb once -- you only ever > have *one* User table, and you only need to run syncdb once to get it. > > I hope that clarifies things. > > Yours, > Russ Magee %-) > > Hello. >> I have a very basic noob question, which I don't know. Please help me >> understand this concepts. When I use *ec2* for my application web >> server, and if I use the services like *autoscale *and *elastic load >> balancer*, do I always have to sync the database with the new *ec2*instances >> that are created? Or its not required? Your help and guidance >> will be greatly appreciated. >> >> Thank you! >> Robin >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Django users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to django-users+unsubscr...@googlegroups.com. >> To post to this group, send email to django-users@googlegroups.com. >> Visit this group at http://groups.google.com/group/django-users. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/django-users/CA%2B4-nGpSoxqr6ff5-D%2B-%2BGvLEADU8RW%3D%3DTSdepk9daWSY6zFNw%40mail.gmail.com >> . >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to django-users+unsubscr...@googlegroups.com. > To post to this group, send email to django-users@googlegroups.com. > Visit this group at http://groups.google.com/group/django-users. > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-users/CAJxq84_miF9N8r1e5gMC-Ee3dq0m-vwkc0%3DDzVv1Dt9%2BWFS7vQ%40mail.gmail.com > . > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CA%2B4-nGrJmMhRiwoXYA4-XXE2_%3DRE_Tmuq5u%2B6SyfvHz5v%2B%2B%3D4A%40mail.gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
