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 <[email protected] > 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 [email protected]. >> To post to this group, send email to [email protected]. >> 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 [email protected]. > To post to this group, send email to [email protected]. > 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 [email protected]. To post to this group, send email to [email protected]. 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.
