Hi, community (and Oslo team),
I am trying to set up a load-balanced DHIS2 web-server system; we have a
web server that’s getting slaughtered with incoming data, and we want to
distribute the load to other physical servers. I’ve done some
experimentation, a fair amount of web-trawling, and using a dedicated nginx
virtual server, have (semi)successfully set up a load-balancing model like
so:
My problem is that going through the load-balancer, I appear to need some
kind of setting that will “keep” me at the Web-Server I first started with
– the load-balancer is set to round-robin, currently, with the following
settings:
upstream dhis2 {
server webserver1.dhis.hisp.org;
server webserver2.dhis.hisp.org;
}
server {
listen 80;
server_name www.hisp.org hisp.org;
location / {
include /etc/nginx/proxy_params;
proxy_pass http://dhis2;
}
location /staging {
include /etc/nginx/proxy_params;
proxy_pass http://dhis2;
}
location /training {
include /etc/nginx/proxy_params;
proxy_pass http://dhis2;
}
}
What’s happening is that I attempt to log in, and get immediately switched
“round-robin” style to the second server for the post (promptly getting the
“forgot password?” prompt).
Nett result: I can’t log in…
If I log in to either one of the webservers directly, everything is fine
and dandy, but going through the LB is a no-go, so far. (I have noticed
some interesting behaviour from two web servers connected to the same Db,
and would be keen to hear what input anyone has on that score – bad idea?
If so, why? And what can be done to address the issues? – but I shall save
that for a separate post…)
Has anyone done any research/experimentation/development with a
load-balancing model of DHIS2 in a web-server context? I would be most
interested to hear input.
Kind Regards,
*Jason Phillips*
[image: hisp]
*Information Systems / Infrastructure*
*Health Information Systems Program____________________________________*
eMail: [email protected]
Landline: +27 21 712 0170
Mobile: +27 72 973 7250
Skype: jason.n.phillips
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