After a point the sql server becomes the bottleneck in lots of web application, and to scale, master-slave replication with single master, multiple slave is recommended. This setup with nginx can be used to accomplish traffic distribution between master and slave based on request method.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | # inspired by http://weichhold.com/2008/09/12/django-nginx-memcached-the-dynamic-trio/
# /etc/nginx/sites-enabled/default
upstream backend_get {
server 127.0.0.1:8080 weight=1;
# any number of servers can be added here to distribute load.
}
upstream backend_post {
server 127.0.0.1:8081 weight=1;
}
server {
listen 80;
server_name localhost;
access_log /var/log/nginx/localhost.access.log;
location / {
proxy_read_timeout 300;
if ($request_method = POST)
{
proxy_pass http://backend_post;
break;
}
# update: after http://simonwillison.net/2008/Oct/14/django/
# use master while the cookie lasts
if ($http_cookie ~* "force_master=([^;]+)(?:;|$)")
{
proxy_pass http://backend_post;
break;
}
proxy_pass http://backend_get;
}
}
# PostCookieMiddleware
class PostCookieMiddleware(object):
""" cookie force_master to take care of replication lag """
def process_response(self, request, response):
if request.method == "POST":
# for next 10 seconds send all requests for this user to master
response.set_cookie("force_master", "42", max_age=10)
return response
|
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